2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2213

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2213

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Observe the scan tool 5 V reference 1 circuit status and the 5 V reference 2 circuit status parameters. Verify the parameters display OK.

2. Ignition ON, observe the DTC information with a scan tool. DTC P0641 or P0651 should not set on this ignition cycle.

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed

from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: Additional DTCs may set when disconnecting components.

1. Ignition OFF, disconnect the harness connector of all the sensors connected to the 5 V reference bus for the applicable DTC. Refer to

Circuit/System Description.

Note: A short to voltage on the signal circuit of certain components may cause this DTC to set.

2. Ignition ON, test for 4.8-5.2 V between one of the 5 V reference circuits and ground.

瀚慖f less than the specified range, test all of the 5 V reference circuits for a short to ground. If all circuits test normal, replace the K20 ECM.

瀚慖f greater than the specified range, test for a short to voltage on all of the 5 V reference circuits, or the signal circuit for each component

associated with the appropriate 5 V reference bus for a short to voltage. If all circuits test normal, replace the K20 ECM.

3. Connect each component associated with the appropriate 5 V reference bus, one at a time, while monitoring the voltage. The voltage should

not change more than 1 V.

瀚慖f the voltage display changes more than the specified range when a component is connected, replace the component.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Accelerator Pedal Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Accelerator Pedal Position

Sensor/Service and Repair)

* Camshaft Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Camshaft Position Sensor/Service

and Repair)

* Crankshaft Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Crankshaft Position

Sensor/Service and Repair)

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)

* Fuel Tank Pressure Sensor Replacement (1500 LWB - 117.3L (31 gal) Tank + E85) (See: Powertrain Management/Computers and Control

Systems/Fuel Tank Pressure Sensor/Service and Repair/Fuel Tank Pressure Sensor Replacement (1500 LWB - 117.3L (31 Gal) Tank + E85)

)Fuel Tank Pressure Sensor Replacement (2500 Series) (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure

Sensor/Service and Repair/Fuel Tank Pressure Sensor Replacement (2500 Series))Fuel Tank Pressure Sensor Replacement (1500 Series) (

See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service and Repair/Fuel Tank Pressure Sensor

Replacement (1500 Series))Fuel Tank Pressure Sensor Replacement (1500 SWB - 98.4L (26 gal) Tank + E85) (See: Powertrain

Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service and Repair/Fuel Tank Pressure Sensor Replacement (1500

SWB - 98.4L (26 Gal) Tank + E85))

* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2054

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2054

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Electronic

Ignition System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. With the engine running, monitor the following ignition control (IC) circuit status parameters with a scan tool:

* Cylinder 1-8 IC Ckt. Short Gnd Test Status

* Cylinder 1-8 IC Ckt. Open Test Status

* Cylinder 1-8 IC Ckt. Short to Volts Test Status

瀚慐ach parameter should display OK.

2. With the engine running, observe the Misfire Current counters with a scan tool.

瀚慣he counters should not be incrementing.

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed

from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. With the engine running, monitor the Cylinder 1-8 IC Circuit Status parameters with a scan tool.

瀚慖f a short to GND or Open status test displays FAULT, test for an open/high resistance or short to ground on the affected IC circuit

terminal C.

瀚慖f a short to volts status test displays FAULT, test for a short to voltage on the affected IC circuit terminal C.

Important: A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.

2. Exchange the affected ignition coil/module with the ignition coil/module of a cylinder that is not affected.

3. Start and run the engine. With a scan tool, monitor the IC circuit parameters and the Misfire Current counters.

瀚慖f the circuit status fault identified or the misfire transfers with the ignition coil/module, replace the ignition coil/module assembly.

瀚慖f the circuit status fault identified or the misfire does not transfer with the ignition coil/module, replace the ECM.

Repair Instructions

* Ignition Coil Replacement (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair)

* Engine Control Module Replacement (See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair)

* Engine Control Module Programming and Setup (See: Powertrain Management/Computers and Control Systems/Engine Control

Module/Testing and Inspection)

Repair Verification

Important: An IC circuit fault condition will result in an engine misfire, and under certain driving conditions could possibly overheat the

3-way catalytic converter.

1. Install any components or connectors that have been removed or replaced during diagnosis.

2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1993

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1993

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

J 26792 HEI Spark Tester

Circuit/System Verification

1. Verify that no other DTCs are set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle).

2. Engine idling, verify there is no abnormal engine noise.

瀚慖f there is an abnormal engine noise, refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and

Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

3. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing. Random misfires that are

not steadily incrementing may be normal.

4. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle

within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Important: You must perform the Circuit/System Verification first.

1. Verify that the following conditions do not exist:

* The fuel injector wire harness electrical connectors are connected to the wrong fuel injectors. Refer to Engine Controls Schematics (See:

Diagrams/Electrical Diagrams/Powertrain Management/System Diagram).

* Engine vacuum leaks

* Fuel pressure that is too low or too high-Refer to Fuel System Diagnosis (w/o FPCM) (See: Powertrain Management/Computers and

Control Systems/Testing and Inspection/Component Tests and General Diagnostics)Fuel System Diagnosis (FPCM) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics).

* Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) (See: Powertrain Management/Computers

and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis

(Without Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel/Testing and Inspection/Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)).

* Restricted exhaust system-Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and

Inspection/Restricted Exhaust).

瀚慖f you find any of the above conditions, repair as necessary.

2. Verify that there is no misfire on cylinders 1, 4, 6, or 7 due to cylinder deactivation-Refer to Cylinder Deactivation (Active Fuel

Management) System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests

and General Diagnostics/Cylinder Deactivation (Active Fuel Management) System Diagnosis).

3. Ignition OFF, install the J 26792 - Tester to the spark plug wire boot of the misfiring cylinder.

Note: An erratic or weak spark is considered a no spark condition.

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1697

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Description and Operation

Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/AF40-6 - Automatic Transmission/Transmission Component and System Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ensure the transmission fluid temperature is between 50-80掳C (122-176掳F).

2. Operate the vehicle in 2nd gear long enough to ensure at least a 3掳C (5掳F) rise in transmission fluid temperature, then operate the vehicle in

Park for 5 s.

3. Observe the scan tool Line Pressure Control Solenoid Valve Current parameter, the reading should be between 0.1-1.1 A.

瀚慖f the parameter in not within specified range or if the DTC resets, go to Circuit/System Testing.

Circuit/System Testing

Command the Line Pressure Control Solenoid Valve with a scan tool. The value should change from 0.0-1.1 A.

If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module. Connect a test lamp between the low reference

circuit terminal 1 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 3 X2 at the K71 Transmission

Control Module. Command the Line Pressure Control Solenoid Valve with a scan tool. The test lamp has to illuminate brighter with increasing

current.

If the test lamp always illuminate or always does not illuminate, replace the K71 Transmission Control Module.

Component Testing

Static Test

1. Ignition OFF, remove the K71 Transmission Control Module.

2. Test for 5-5.6 ohm at 20掳C (68掳F) between the low reference circuit terminal 1 X2 and the voltage supply circuit terminal 3 X2.

瀚慖f less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q23 Line Pressure Control

Solenoid Valve.

3. Test for infinite resistance between each terminal and the low reference circuit terminal 1 X2 and also to the voltage supply circuit terminal 3

X2.

瀚慖f less than the specified range, replace the wiring harness.

4. If all circuit test normal, perform the Control Solenoid Valve Inspection (M36 and MXE) (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/AF40-6 - Automatic Transmission).

瀚慖f the inspection test normal, replace the valve body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Control valve body replacement-Refer to Control Valve Body Replacement (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Valve Body/Service and Repair/AF40-6 - Automatic Transmission/Control Valve Body Replacement) for

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1045

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Air Intake System Description (LF1)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

J 38522 Variable Signal Generator

Circuit/System Verification

1. Engine idling for 1 minute, observe the DTC information with a scan tool. DTCs P0100, P0102 and P0103 should not set.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B75 MAF sensor.

2. Ignition OFF, remove the fuse that supplies B+ to terminal 56 X2 of the ECM.

3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm

between the ground circuit terminal 2 and the ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

4. Install fuse that supplies B+ to terminal 56 X2 of the ECM.

Caution: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur

due to excessive current draw.

5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 4 and ground.

瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and

the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.

6. Test for 4.8-5.2 V between the signal circuit terminal 5 and the ground circuit terminal 2.

瀚慖f less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit/connections test

normal, replace the K20 ECM.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the K20

ECM.

7. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal 5 at the B75 MAF sensor harness connector. Connect the

battery voltage supply to B+, and the black lead to ground.

8. Set the J 38522 Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.

9. Ignition ON, observe the scan tool MAF Sensor Hz parameter. The parameter should be between 4,950-5,050 Hz.

瀚慖f the parameter is not within the specified range, replace the K20 ECM.

10. If all circuits/connections test normal, replace the B75 MAF sensor.

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1975

Connector End View Reference

* Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

* Inline Harness Connector End Views (See: Diagrams/Connector Views/Multiple Junction Connector/Connector End Views By Number)

Description and Operation

Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 -

Automatic Transmission/Transmission General Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: If other DTCs are set, diagnose those DTCs first.

1. Engine idling in Park, with parking brake applied and drive wheels chocked.

2. Perform the Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing

and Inspection/Component Tests and General Diagnostics/6T70/6T75 - Automatic Transmission/Transmission Fluid Level and Condition

Check) to verify correct fluid level and condition.

3. Monitor the TFP Switch 4 parameter with a scan tool. Place the gear select lever in Park, Reverse, and Neutral range. Verify the TFP Switch

4 parameter states are correct for Park, Reverse, and Neutral. Refer to Transmission Fluid Pressure Switch Logic (See:

Specifications/Mechanical Specifications/Automatic Transmission/Transaxle/System Specifications/6T70/6T75 - Automatic

Transmission/Transmission Fluid Pressure Switch Logic).

4. Place the gear select lever in Drive range. Command the shift transmission with a scan tool through all forward ranges. Verify the TFP

Switch 4 parameter states are correct for all forward ranges. Refer to Transmission Fluid Pressure Switch Logic (See:

Specifications/Mechanical Specifications/Automatic Transmission/Transaxle/System Specifications/6T70/6T75 - Automatic

Transmission/Transmission Fluid Pressure Switch Logic).

5. Engine idling in Park, verify with a scan tool the Transmission ISS/OSS Supply Voltage parameter displays OK.

6. Engine idling in Park. Observe the Transmission ISS parameter on the scan tool, while varying the engine speed. The Transmission ISS

parameter should vary with engine speed and not drop out.

7. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS parameter on the scan tool. The Transmission OSS

parameter should vary with the vehicle speed and not drop out.

Note: Perform a scan tool snapshot during the road test.

8. Perform the Road Test (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Initial Inspection and

Diagnostic Overview). Verify the transmission operation performs as indicated in the road test instructions

9. Review the scan tool snapshot data. Verify the following transmission data parameters display the correct values for each gear range.

* Transmission ISS

* Transmission OSS

* PC Solenoid 5

* TFP Switch 4

10. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Perform the Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component

Tests and General Diagnostics/6T70/6T75 - Automatic Transmission/Line Pressure Check). Verify the transmission line pressures are within

the range specified in the Line PC Solenoid Valve Pressure table. Refer to Solenoid Valve Pressure (See: Specifications/Mechanical

Specifications/Automatic Transmission/Transaxle/System Specifications/6T70/6T75 - Automatic Transmission/Solenoid Valve Pressure).

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2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 983

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation/ABS

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Inspect for one tire that has improper air pressure or improper size.

C123A

DTC C056D, C120C, C121C, C121E, C121F, C123A-C1256, C126E-C127C, C12C2-C12DB, C12DE, C12DF, or C12F2-C12F6

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC C056D 00

- ECU Hardware Performance

DTC C056D 3C

- ECU Hardware Performance Internal Communications Failure

DTC C056D 59

- ECU Hardware Performance

DTC C120C

- Brake Pedal Position Sensor 4 Plausibility

DTC C121C

- EBCM Internal Communication Error

DTC C121E

- EBCM Unimplemented Interrupt

DTC C121F

- EBCM Unexpected Exception

DTC C123A

- EBCM High End Timer Watchdog

DTC C123B

- EBCM High End Timer Program Overflow

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2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 476

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) (See: Body and Frame/Mirrors/Description and Operation/Outside Mirror Description

and Operation (Heated Mirrors))Outside Mirror Description and Operation (Power Mirrors) (See: Body and Frame/Mirrors/Description and

Operation/Outside Mirror Description and Operation (Power Mirrors))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool References

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.

Circuit/System Verification

Ignition ON, observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2-4.8 volts

and change as the mirror is moved, left, right, up, and down.

Circuit/System Testing

1. Ignition OFF, disconnect the X7 harness connector at the appropriate door module.

2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:

* 5-volt reference circuit terminal 7

* Signal circuit terminal 4

* Signal circuit terminal 5

* Low reference circuit terminal 10

瀚慖f the test lamp illuminates, test the appropriate circuit for a short to voltage.

3. Ignition OFF, test for infinite resistance between the following circuits and ground:

* 5-volt reference circuit terminal 7

* Signal circuit terminal 4

* Signal circuit terminal 5

* Low reference circuit terminal 10

瀚慖f less than the specified value, test the appropriate circuit for a short to ground.

4. Test for 4K-7K ohms between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 10.

瀚慖f not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits

test normal, test or replace the rearview mirror.

5. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 4.

瀚慖f not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview

mirror.

6. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 5.

瀚慖f not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview

mirror.

7. If all circuits test normal, replace the door module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

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2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 448

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Retained Accessory Power Description and Operation (See: Power and Ground Distribution/Description and Operation/Retained Accessory Power

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X5 harness connector at the BCM.

2. Test for greater than infinite resistance between the BCM ignition circuit terminal 13 and ground.

瀚慖f less than specified, test for a short to ground.

3. If the circuit tests normal, test or replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.

Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming

B1440

DTC B1440

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC B1440 00

- Power Mode Master Input Circuits Mismatch

Diagnostic Fault Information

Circuit/System Description

This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete

ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a

reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can

allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 864

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 864

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation/ABS

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition On, verify that DTC U2142 or C0292 is not set.

瀚慖f any of the DTCs are set, Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. With a scan tool, clear the DTC.

3. Test drive the vehicle while observing the scan tool Yaw Rate and Lateral Accelerometer Sensor parameter. The parameters should vary as

the vehicle changes directions.

瀚慖f the parameters are locked or erratic, replace the yaw/lateral accelerometer sensor.

4. Replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction

Control Systems/Yaw Rate Sensor/Service and Repair/Less than 3900 kg (8600 lb) GVW)

* Control Module References (See: Testing and Inspection/Programming and Relearning)for EBCM replacement, setup, and programming

Antilock Brake System - Non-Hybrid Less than 3900 kg (8600 lb) GVW

DTC C0186 or C0196

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0186 00

- Lateral Accelerometer Circuit

DTC C0186 5A

- Lateral Accelerometer Circuit Plausibility Failure

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1539

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1539

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Electrical Center Identification Views (See: Maintenance/Fuses and Circuit Breakers/Fuse/Application and ID)

* Probing Electrical Connectors (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Circuit Testing/Probing Electrical Connectors)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

J 35616 - Connector Test Adapter Kit

Circuit/System Verification

Note: If you were sent here from Engine Cranks But Does Not Run proceed to Circuit/System Testing.

1. Engine running, command the Engine Controls (EC) Ignition Relay ON and OFF with a scan tool while observing the following EC Ignition

Relay control circuit status parameters:

* Engine Controls Ignition Relay Control Circuit Low Voltage Test Status

* Engine Controls Ignition Relay Control Circuit Open Test Status

* Engine Controls Ignition Relay Control Circuit High Voltage Test Status

Each parameter should display OK or Not Run.

2. Ignition ON, you should be able to communicate with the ECM using a scan tool.

3. Ignition ON, view the DTC information with a scan tool. DTC P0685, P0686, P0687, P0689, or P0690 should not set.

4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the KR75 powertrain relay.

2. Ignition ON, verify a test lamp illuminates between both of the following relay battery voltage circuit terminals and ground.

* Terminal 86

* Terminal 87

瀚慖f the test lamp does not illuminate, test the relay battery voltage circuit for a short to ground or an open/high resistance.

Note: The ignition voltage circuit is between the powertrain relay and the ECM. The ignition voltage circuit is a feedback circuit.

3. Ignition OFF, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 30 and ground.

瀚慖f the test lamp illuminates, test the ignition voltage circuit for a short to voltage.

4. Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 87 and the relay switch ignition voltage circuit terminal 30.

5. Ignition ON, observe the scan tool EC Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should

display 9-14 V.

瀚慖f not the specified range, or the ECM does not communicate, test the ignition voltage circuit between the powertrain relay and the ECM

for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.

6. Ignition OFF, verify that a test lamp does not illuminate between the control circuit terminal 85 and B+.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 671

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 671

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems Description

and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the DRL resistor.

2. Connect a test lamp between the control circuit terminal C and B+.

3. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the BCM.

4. Ignition OFF, connect the harness connector at the DRL resistor.

5. Disconnect the harness connector at the inoperative headlamp assembly.

6. Connect a test lamp between the signal circuit terminal D and B+.

7. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

瀚慖f the test lamp is always ON, test the signal circuit for a short to ground. If the circuit tests normal, replace the DRL resistor.

瀚慖f the test lamp is always OFF, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the DRL resistor.

8. Connect a test lamp between the signal circuit terminal B and B+.

9. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

瀚慖f the test lamp is always ON, test the signal circuit for a short to ground. If the circuit tests normal, replace the DRL resistor.

瀚慖f the test lamp is always OFF, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the DRL resistor.

10. If all circuits test normal, replace the appropriate headlamp.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Headlamp Replacement (Cadillac Escalade) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp

Replacement (Cadillac Escalade))Headlamp Replacement (GMC Yukon Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service

and Repair/Removal and Replacement/Headlamp Replacement (GMC Yukon Two-mode Hybrid))Headlamp Replacement (Yukon) (See:

Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Yukon))Headlamp Replacement

(Chevrolet Tahoe Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp

Replacement (Chevrolet Tahoe Two-mode Hybrid))Headlamp Replacement (Tahoe, Avalanche) (See: Lighting and

Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Tahoe, Avalanche))Headlamp Replacement

(Escalade PLATINUM) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement

(Escalade Platinum))Headlamp Replacement (Non HID) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and

Replacement/Headlamp Replacement (Non HID))

* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and

Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

With RPO Code X88, Z75, and Z88

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1409

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1409

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Drive Motor Battery System Description ()

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

* EL-48571 High Voltage Battery Pin Out Box

* EL-48900 HEV Safety Kit

Circuit/System Verification

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V, and all readings should be within 1.5

V of each other.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection.

Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures

must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

- Visually and functionally inspect the gloves before use.

- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or

not.

Failure to follow the procedures exactly as written may result in serious injury or death.

1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().

2. Disconnect the X4 harness connector at the drive motor battery control module.

3. Connect to the EL-48571 high voltage battery pin out box.

4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.

5. Each battery voltage reading should be between 10-19 V.

瀚慖f not within the specified range, replace the drive motor battery assembly.

6. Each battery voltage reading should be within 1.5 V of each other.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1348

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1348

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Drive Motor Battery System Description ()

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

* EL-48571 High Voltage Battery Pin Out Box

* EL-48900 HEV Safety Kit

Circuit/System Verification

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V, and all readings should be within 1.5

V of each other.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection.

Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures

must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

- Visually and functionally inspect the gloves before use.

- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or

not.

Failure to follow the procedures exactly as written may result in serious injury or death.

1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().

2. Disconnect the X4 harness connector at the drive motor battery control module.

3. Connect to the EL-48571 high voltage battery pin out box.

4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.

5. Each battery voltage reading should be between 10-19 V.

瀚慖f not within the specified range, replace the drive motor battery assembly.

6. Each battery voltage reading should be within 1.5 V of each other.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1210

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1210

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Drive Motor Generator Battery Cooling Description ()

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

1. Verify that DTC P0A80, P0A81 or P0BBD is not set.

瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Ignition ON, observe the scan tool BECM hybrid battery temperature parameters. The readings should be between -39 and +95掳C (-38.2 and

+203掳F) with no greater than a 15掳C ( 59掳F) difference between any of the four temperature sensor readings. Refer to Temperature Versus

Resistance ().

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection.

Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures

must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

- Visually and functionally inspect the gloves before use.

- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or

not.

Failure to follow the procedures exactly as written may result in serious injury or death.

1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().

2. Verify that none of the following conditions exist:

* The inlet and outlet air vents do not have any obstructions or blockages.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1085

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1085

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the fuel pump/trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1079

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1079

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the fuel pump/trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1073

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1073

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the fuel pump/trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1067

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1067

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the fuel pump/trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the fuel pump/trailer brake control module.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1038

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1038

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

* Power Steering System Description and Operation (Hydraulic Power Steering) (See: Steering and Suspension/Steering/Description and

Operation/Power Steering System Description and Operation (Hydraulic Power Steering))Power Steering System Description and Operation

(EPS) (See: Steering and Suspension/Steering/Description and Operation/Power Steering System Description and Operation (EPS))

* Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

1. Verify that there are no DTCs in the APM that disable the 42-volt circuit, no engine-stall DTCs in the ECM, and no U-codes in any module.

瀚慖f there are any of the specified DTCs, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0

volts.

瀚慖f not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests

and General Diagnostics/Charging System Test).

3. Engine running, observe the scan tool PSCM Intermediate Voltage parameter. The voltage should be 37.5-50 volts.

瀚慖f not within the specified range, refer to Voltage Out Of Range At All Times.

4. Engine running, rotate the steering wheel left and right while stationary. Observe the scan tool PSCM Intermediate Voltage parameter. The

voltage should remain greater than 37.5 volts.

瀚慖f the voltage is less than the specified range only when turning the steering wheel, refer to Low Voltage When Turning.

5. Operate the vehicle on a bumpy road. Observe the scan tool APM 42V Circuit Maximum parameter. The scan tool 42V Circuit Maximum

parameter should be less than 50 volts.

瀚慖f the voltage is greater than the specified range, replace the PSCM.

Circuit/System Testing

Voltage Out Of Range At All Times

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal

Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must