2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2773

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2773

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)

Circuit/System Verification

With a scan tool, ensure the following DTCs are not present in the modules as follows:

BCM

* U1814

* U2099

SDGM

* U1812

* B1453

If any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the SDGM.

2. Verify less than 0.5 volts between the wake up signal circuit terminal 19 and ground.

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

3. Ignition ON, verify B+ between the communication enable signal circuit terminal 16 and ground.

瀚慖f less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the BCM.

4. If all circuits test normal, replace the SDGM.

Repair Instructions

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

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

Procedures/Wiring Repairs/GMLAN Wiring Repairs)

U209D

DTC U209D

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 U209D 00

- Battery Energy Control Module High Speed Communication Enable Circuit High

Diagnostic Fault Information

Circuit/System Description

Modules connected to the LAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2446

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2446

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

* Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Electronic Component Description)

* Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Transmission General Description)

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

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Transmission Component and System Description)

* Park - Engine Running (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Park - Engine Running)

* Reverse (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6L45/6L50/6L80/6L90 -

Automatic Transmission/Reverse)

* Neutral - Engine Running (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Neutral - Engine Running)

* Drive Range, First Gear Engine Braking (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/First Gear Engine Braking)

* Drive Range, First Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/First Gear)

* Drive Range, Second Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Second Gear)

* Drive Range, Third Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Third Gear)

* Drive Range, Third Gear Default (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Third Gear Default)

* Drive Range - Fourth Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Fourth Gear)

* Drive Range, Fifth Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Fifth Gear)

* Drive Range, Fifth Gear Default (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Fifth Gear Default)

* Drive Range, Sixth Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Sixth Gear)

* Fluid Passages (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6L45/6L50/6L80/6L90 -

Automatic Transmission/Fluid Passages)

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/Initial Inspection and Diagnostic Overview/6L45/6L50/6L80/6L90 - Automatic Transmission/Transmission Fluid Level and

Condition Check) to verify correct fluid level and condition.

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

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

Diagnostic Overview/6L45/6L50/6L80/6L90 - Automatic Transmission/Road Test). Verify the transmission operation performs as indicated

in the road test instructions.

4. Review the scan tool snapshot transmission data parameters. Verify the engine and transmission data parameters display the correct values in

all forward gear ranges:

* Engine Speed

* Vehicle Speed

* Transmission ISS

* Transmission OSS

* Shift Solenoid Valve 1

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2235

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)

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

Procedures/Circuit Testing/Probing Electrical Connectors)

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

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 GM-Approved Terminal Test Kit

* J 43244 Relay Puller Pliers

Circuit/System Verification

1. Ignition ON, engine OFF, command the powertrain relay ON and OFF, with a scan tool, while observing the following powertrain relay coil

control circuit status parameters.

* Powertrain relay coil control Ckt. Short Gnd Test Status

* Powertrain relay coil control Ckt. Open Test Status

* Powertrain relay coil control Ckt. Short Volts Test Status

Each parameter should toggle between OK and Not Run or Not Run and OK

2. Ignition ON, observe the DTC information with a scan tool. DTC P0685, P0689 or P0690 should not set.

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: You must perform the Circuit/System Verification first.

1. Ignition OFF, disconnect the KR75 powertrain relay.

2. Verify a test lamp illuminates between both of the following relay battery voltage circuit terminals and ground:

* Terminal 85

* Terminal 30

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

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

3. Ignition OFF, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 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 30 and the relay switch ignition voltage circuit terminal 87.

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 86 and B+.

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

7. Connect a DMM set to the diode setting between the control circuit terminal 86 and ground.

8. Ignition ON, verify the DMM does not display OL.

瀚慖f the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

9. If all circuits test normal, replace the KR75 powertrain relay.

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2209

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2209

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, command the A/C Relay ON and OFF with a scan tool. Feel/listen for the A/C relay to click.

Circuit/System Testing

1. Ignition OFF, disconnect the A/C relay.

2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 86 and ground.

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

3. Verify that a test lamp illuminates between the ignition circuit terminal 85 and ground.

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

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

4. Verify that a test lamp illuminates between the relay B+ circuit terminal 30 and ground.

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

circuit fuse is open, replace the A/C clutch relay.

5. Disconnect the harness connector at the A/C clutch coil.

6. Test for less than 1 ohm between the ground circuit terminal 2 and ground.

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

7. Connect the harness connector at the A/C clutch coil.

8. Connect a 10-amp fused jumper wire between the B+ circuit terminal 30 and control circuit terminal 87. Verify the A/C clutch is activated.

瀚慖f the A/C clutch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the A/C

clutch.

9. Connect a test lamp between the ignition circuit terminal 85 and the control circuit terminal 86.

10. Command the A/C relay output function 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 ECM.

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 ECM.

11. If all circuits test normal, test or replace the A/C clutch relay.

Component Testing

1. Ignition OFF, disconnect the A/C COMP relay.

2. Test for 60-180 ohms between terminals 85 and 86.

瀚慖f the resistance is not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f not the specified value, replace the relay.

4. Install a 30-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test

for less than 2 ohms between terminals 30 and 87.

瀚慖f greater than the specified range, replace the relay.

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1896

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

* DT-47825-10 Jumper Harness

* DT-48493 Jumper Harness

Circuit/System Verification

Test for correct operation of the Direction IMS in every range selection. Refer to Typical Scan Tool Data.

If the IMS operation matches the logic table, the system is functioning normally.

Circuit/System Testing

1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool Direction IMS parameter should display HIGH for the R1,

R2, D1, D2 and S signal circuit displays.

瀚慖f a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground.

瀚慖f the circuit tests normal, replace the PIM.

2. Install DT-48493 to the vehicle harness connector X176. Verify that a test lamp illuminates between the direction IMS switch ground circuit

and battery positive.

瀚慖f the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to

voltage condition.

瀚慖f the circuit tests normal, replace the PIM.

3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493 and the ground circuit terminal. The scan tool

parameter should display LOW for each signal circuit when grounded.

瀚慖f a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to

voltage condition.

瀚慖f the circuit tests normal, replace the PIM.

4. Disconnect the transmission 16-way X1 connector. Install DT-47825-10 to the vehicle harness. Connect a 3-amp fused jumper wire between

the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.

瀚慖f the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to

voltage condition.

瀚慖f the circuit tests normal, replace the PIM.

Important: The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid

pan assembly must be removed in order to perform the diagnostic tests.

5. Disconnect the IMS connector at the switch.

Important: Connect one end of the DT-48493 to the transmission connector. Use the other end as the terminal testing point.

瀚慣est the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to

ground, open, high resistance or short to voltage condition.

Important: Connect one end of the DT-47825-10 to the transmission connector. Use the other end as the terminal testing point.

瀚慣est the Starter signal circuit between the IMS and the transmission 16-way X1 connector for a short to ground, open, high resistance or

short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path.

瀚慖f the circuit, including the TCM, tests normal, replace the IMS switch.

Repair Instructions

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

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 2005

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 2005

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 data TCC Pressure Control Solenoid Valve Current parameter. The reading should be between 0.1-1.1 A.

Circuit/System Testing

Command the TCC Solenoid Valve increase and decrease with a scan tool. The value should rise from 0.1-1.1 A and return to 0.1 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 4 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 9 X2 at the K71 Transmission

Control Module. Command the TCC Solenoid Valve increase and decrease with a scan tool. The test lamp has to illuminate brighter with increasing

current.

If the test lamp always illuminates 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 4 X2 and the voltage supply circuit terminal 9 X2.

瀚慖f less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27D Pressure Control

Solenoid Valve 4.

3. Test for infinite resistance between each terminal and the low reference circuit terminal 4 X2 and also to the voltage supply circuit terminal 9

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. Refer to 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 control valve body.

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

replacement, setup, and programming.

* TCM-Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for replacement, setup, and

programming.

* Perform the Transmission Adaptive Functions (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/AF40-6 - Automatic Transmission/Transmission Adaptive Functions).

* Wiring harness-Refer to Automatic Transmission Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Wiring Harness/Service and Repair) for replacement.

6T70/6T75 - Automatic Transmission

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1514

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. Ignition ON, observe the DTC information with a scan tool. DTC P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, or P0699

should not set.

2. Observe the appropriate scan tool 5 V Reference 1, 2, or 3 Circuit Status parameter. The parameter should display OK.

3. 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

Note: Additional DTCs will set when disconnecting the components.

1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.

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

瀚慖f the voltage is less than the specified range, test for a short to ground on the 5 V reference circuit for each of the affected components. If

all circuits test normal, replace the K20 ECM.

瀚慖f the voltage is greater than the specified range, test for a short to voltage on the 5 V reference circuit for each of the affected

components. If all circuits test normal, replace the K20 ECM.

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

3. Connect each component associated with the affected 5 V reference circuit one at a time while monitoring the appropriate scan tool 5 V

Reference Circuit Voltage parameter. Verify the voltage remains between 4.8-5.2 V.

瀚慖f not within the specified range when a component is connected, test the signal circuit of that component for a short to voltage. If the

circuit tests normal, replace the component.

Repair Instructions

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

* Accelerator Pedal with Position Sensor Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Accelerator

Pedal/Service and Repair/Accelerator Pedal with Position Sensor Assembly Replacement)

* Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LF1) (See: Heating and Air Conditioning/Refrigerant Pressure Sensor /

Switch/Service and Repair)Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LAU) (See: Heating and Air

Conditioning/Refrigerant Pressure Sensor / Switch/Service and Repair)

* Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake (See: Powertrain Management/Computers and Control

Systems/Camshaft Position Sensor/Service and Repair/Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake)

* Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust (See: Powertrain Management/Computers and Control

Systems/Camshaft Position Sensor/Service and Repair/Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust)

* Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake (See: Powertrain Management/Computers and Control

Systems/Camshaft Position Sensor/Service and Repair/Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake)

* Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust (See: Powertrain Management/Computers and Control

Systems/Camshaft Position Sensor/Service and Repair/Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust)

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

Sensor/Service and Repair)

* Fuel Injector Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Service and Repair)

* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service

and Repair)

* Secondary Injection Shutoff Valve Pressure Sensor Replacement (See: Powertrain Management/Emission Control Systems/Air Injection/Air

Injection Check Valve/Service and Repair)

* Throttle Body Assembly Replacement (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)Throttle Body Assembly Replacement (LAU) (See: Powertrain Management/Fuel Delivery and Air

Induction/Throttle Body/Service and Repair/Removal and Replacement)

* Turbocharger Pressure Sensor Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Turbocharger/Service and

Repair/Turbocharger Pressure Sensor Replacement)

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

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1477

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 Testing

1. Ignition OFF, disconnect the KR27 starter relay.

2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 10 Ohms between the relay

ground circuit terminal 85 and ground.

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

3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 30 and ground.

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

瀚慖f the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground.

4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.

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

5. Parking brake applied and the transmission is in NEUTRAL or PARK. Momentarily install a 30 A fused jumper wire between the B+ circuit

terminal 30 and the control circuit terminal 87. Verify the starter is activated.

瀚慖f the starter does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the starter.

6. Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.

7. Transmission in park or neutral, cycle the ignition between the OFF and CRANK position. The test lamp should turn ON and OFF when

changing between the selected states.

瀚慖f the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the K20 ECM.

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

the K20 ECM.

8. If all circuits tests normal, replace the KR27 starter relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the starter relay.

2. Test for 60-180 Ohms between terminals 85 and 86.

瀚慖f not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f not the specified value, replace the relay.

4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for

less than 2 Ohms between terminals 30 and 87.

瀚慖f greater than specified range, replace the relay.

Repair Instructions

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

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1186

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1186

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. Engine running, command the Turbocharger Wastegate Solenoid Valve to 20% with a scan tool while observing the following control circuit

status parameters:

* Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status

* Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status

* Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status

Each parameter should display OK.

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. Inspect the turbocharger and the wastegate solenoid valve for damage. Refer to Turbocharger Cleaning and Inspection (See: Engine,

Cooling and Exhaust/Engine/Service and Repair/Overhaul/102. Turbocharger Cleaning and Inspection)

2. Ignition OFF, disconnect the harness connector at the Q42 turbocharger wastegate solenoid valve.

3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 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 components connected to the ignition circuit and replace as necessary.

4. Connect a test lamp between the control circuit terminal 2 and the ignition circuit terminal 1.

5. Command the Turbocharger Wastegate Solenoid Valve to 50% with a scan tool. The test lamp should illuminate when commanded to 50%

and turn OFF when commanded to 0%.

瀚慖f the test lamp is always ON, test the control circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 ECM.

瀚慖f the test lamp is always OFF, test the control circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit tests

normal, replace the K20 ECM.

6. Test for 2.6-4.6 V between the control circuit terminal 2 and ground.

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

7. If all circuits test normal, test or replace the Q42 turbocharger wastegate solenoid valve.

Component Testing

1. Ignition OFF, disconnect the harness connector at the Q42 turbocharger wastegate solenoid valve.

2. Test for 20-30 ohm between the control terminal 2 and the ignition terminal 1 of the Q42 turbocharger wastegate solenoid valve.

瀚慖f not within the specified range, replace the Q42 turbocharger wastegate solenoid valve.

3. Test for infinite resistance between each terminal and the Q42 turbocharger wastegate solenoid valve housing.

瀚慖f not the specified value, replace the Q42 turbocharger wastegate solenoid valve.

Repair Instructions

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

* Turbocharger Disassemble (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/101. Turbocharger Disassemble)

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

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1416

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1416

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 B1 A/C Refrigerant Pressure Sensor.

2. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 2 and ground.

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

replace K20 Engine Control Module.

瀚慖f greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine

Control Module.

3. Test for 4.8-5.2V between the 5V reference circuit terminal 2 and the low reference circuit terminal 1.

瀚慖f less than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace K20 Engine

Control Module.

瀚慖f greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine

Control Module.

4. Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.3V.

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

Module.

5. Install a 3A fused jumper wire between the following signal circuit terminal 3 and the 5V reference circuit terminal 2. Verify the scan tool

A/C high side pressure sensor parameter is greater than 4.8V.

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

K20 Engine Control Module.

6. If all circuits test normal, replace the B1 A/C Refrigerant Pressure Sensor.

Repair Instructions

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

* HVAC Component Replacement Reference (See: Heating and Air Conditioning/Service and Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning)

P0560

DTC P0560

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 P0560

- System Voltage - ECM

Diagnostic Fault Information

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 472

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 472

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 BCM SWC Bank 1 Status parameter. The reading should be idle and change between SW1-SW7 when pushing

the appropriate switch.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the right steering wheel control switch.

2. Ignition ON, test for B+ between the voltage reference circuit terminal 3 and ground.

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

normal, replace the BCM.

瀚慖f greater than the specified value, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.

3. If all circuits test normal, test or replace the right steering wheel control switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the right steering wheel control switch.

2. Test the resistance between the voltage reference terminal 3 and the signal terminal 4 while depressing the appropriate steering wheel

controls switch listed below.

瀚慖f not the specified range, replace the steering wheel switch.

Repair Instructions

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

* Steering Wheel Control Switch Assembly Replacement (See: Accessories and Optional Equipment/Sensors and Switches - Accessories and

Optional Equipment/Steering Mounted Controls Assembly/Service and Repair)

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

B1544

DTC B1544, B1600, or B1605

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 B1544 01

- Mirror Motors Common Circuit Short to Battery

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 420

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 420

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 rear video display.

2. Ignition ON, test for 100-300 Hz at the control circuit terminal 9.

瀚慖f not within the specified range, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit

tests normal, replace the radio.

3. If all circuits test normal, replace the rear video display.

Repair Instructions

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

* Video Display Replacement (Second Row) (See: Accessories and Optional Equipment/Entertainment Systems/Television / Monitor/Service

and Repair/Video Display Replacement (Second Row))Video Display Replacement (Third Row) (See: Accessories and Optional

Equipment/Entertainment Systems/Television / Monitor/Service and Repair/Video Display Replacement (Third Row))

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

Engine Electrical

DTC B1325

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 B1325 03

- Device Power Circuit Voltage Below Threshold

DTC B1325 07

- Device Power Circuit Voltage Above Threshold

Diagnostic Fault Information

Circuit/System Description

The control modules on this vehicle monitor the voltage on the battery positive (B+) voltage circuits. The following modules on this vehicle will set

DTC B1325 if high or low battery voltage is detected:

* Audio amplifier

* Instrument panel cluster (IPC)

* Passenger presence system (PPS)

* Radio

* Rear object sensor control module

Conditions for Running the DTC

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 413

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 413

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-48028 Digital Radio Test Antenna

Circuit System Verification

With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM. Verify XM reception is clear and the No XM Signal

message is not displayed on the radio.

Circuit/System Testing

1. Ignition OFF, disconnect the antenna coax from the DRR. Connect the EL-48028 to the DRR.

2. Radio ON, tuned to XM, verify DTC B1259 is not set as current.

瀚慖f the DTC is current, replace the DRR.

3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the digital radio antenna.

4. Ignition ON, test for 4.5-5.5 volts between the antenna coax center terminal and the coax outer shield.

瀚慖f not within the specified range, replace the antenna coax.

5. If all circuits test normal, replace the digital radio antenna.

Repair Instructions

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

* Cellular Communications/Digital Radio Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service

and Repair/Cellular Communications/Digital Radio Antenna Replacement)

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

B1277

DTC B1277, B127C, or B127D

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 B1277 01

- Microphone 1 (LF) Input Signal Circuit Short to Battery

DTC B1277 02

- Microphone 1 (LF) Input Signal Circuit Short to Ground

DTC B1277 04

- Microphone 1 (LF) Input Signal Circuit Open

DTC B1277 1A

- Microphone 1 (LF) Input Signal Circuit Bias Level Out of Range

DTC B127C 01

- Microphone 2 (RF) Input Signal Circuit Short to Battery

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 719

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 719

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

Verify DTC B3109, B3110, B3111, or B3112 are not set.

If any of the DTCs are set, replace the battery in the appropriate keyless entry transmitter. Operate the transmitter 3 consecutive times. If the DTC

resets, replace the keyless entry transmitter.

Repair Instructions

Important: This vehicle may be equipped with the 2-Way Advanced Remote Start System. Vehicle equipped with the 2-Way Advanced

Remote Start System can be identified by an LCD screen on the keyless entry transmitter or a yellow label on the RCDLR. When servicing

the 2-Way Advanced Remote Start System, ensure that the correct parts are installed during replacement. Service parts for the 2-Way

Advanced Remote Start System can be found in the Accessory section of the parts manual.

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

Remote Control Door Lock Transmitter Programming (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless

Entry/Keyless Entry Transmitter/Testing and Inspection)

B3112

DTC B3109, B3110, B3111, or B3112

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 B3109 00

- Keyless Entry Transmitter 1 Low Battery

DTC B3110 00

- Keyless Entry Transmitter 2 Low Battery

DTC B3111 00

- Keyless Entry Transmitter 3 Low Battery

DTC B3112 00

- Keyless Entry Transmitter 4 Low Battery

Circuit/System Description

With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the remote control

door lock receiver (RCDLR) along with the commanded keyless entry function.

Conditions for Running the DTC

A keyless transmitter button is pressed.

Conditions for Setting the DTC

The DTC sets after 3 consecutive low battery signals from the same programmed transmitter.

Action Taken When the DTC Sets

2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1997

2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1997

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

* DT-47825-10 Jumper Harness

* DT-48493 Jumper Harness

Circuit/System Verification

Test for correct operation of the Direction IMS in every range selection. Refer to Typical Scan Tool Data.

If the IMS operation matches the logic table, the system is functioning normally.

Circuit/System Testing

1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool Direction IMS parameter should display HIGH for the R1,

R2, D1, D2 and S signal circuit displays.

锟斤拷If a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground.

锟斤拷If the circuit tests normal, replace the PIM.

2. Install DT-48493 to the vehicle harness connector X176. Verify that a test lamp illuminates between the direction IMS switch ground circuit

and battery positive.

锟斤拷If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to

voltage condition.

锟斤拷If the circuit tests normal, replace the PIM.

3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493 and the ground circuit terminal. The scan tool

parameter should display LOW for each signal circuit when grounded.

锟斤拷If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to

voltage condition.

锟斤拷If the circuit tests normal, replace the PIM.

4. Disconnect the transmission 16-way X1 connector. Install DT-47825-10 to the vehicle harness. Connect a 3-amp fused jumper wire between

the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.

锟斤拷If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to

voltage condition.

锟斤拷If the circuit tests normal, replace the PIM.

Important: The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid

pan assembly must be removed in order to perform the diagnostic tests.

5. Disconnect the IMS connector at the switch.

Important: Connect one end of the DT-48493 to the transmission connector. Use the other end as the terminal testing point.

锟斤拷Test the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to

ground, open, high resistance or short to voltage condition.

Important: Connect one end of the DT-47825-10 to the transmission connector. Use the other end as the terminal testing point.

锟斤拷Test the Starter signal circuit between the IMS and the transmission 16-way X1 connector for a short to ground, open, high resistance or

short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path.

锟斤拷If the circuit, including the TCM, tests normal, replace the IMS switch.

Repair Instructions

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