2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1552

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1552

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

P0699

DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LAU)

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.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1162

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1162

1. Ignition ON, verify that DTC P0697, P0698, or P0699 is not set.

瀚慖f a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LAU) ( See: P Code Charts/P0641/ECM) for further

diagnosis.

2. Clear the DTC Info with a scan tool.

3. Start the engine, observe the scan tool Throttle Position Sensor 1 and 2 Voltage parameters. throttle position sensor 1 should be between

0.17-4.6 V, and throttle position sensor 2 should be between 0.15-4.8 V.

4. Observe the scan tool Throttle Position Sensor 1 and 2 parameters while performing the tests listed below. The parameter should display

Agree.

* Rapidly depress the accelerator pedal from the rest position to the WOT position and release pedal. Repeat the procedure several times.

* Slowly depress the accelerator pedal to WOT, then slowly return the pedal to closed throttle. Repeat the procedure several times.

5. Observe the DTC information with a scan tool. DTCs P0121, P0122, P0123, P0221, P0222, and P0223 should not set.

6. 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 Q38 throttle body.

2. 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 low reference circuit terminal C and ground.

瀚慖f greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests

normal, replace the K20 engine control module.

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

瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20

engine control module.

瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.

4. Ignition ON, verify that the scan tool Throttle Position Sensor 1 Voltage parameter is less than 0.3 V.

瀚慖f greater than the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the K20

engine control module.

5. Connect a 3 A fused jumper wire between the 5 V reference circuit terminal E and the throttle position sensor 1 signal circuit terminal D.

Verify the scan tool Throttle Position Sensor 1 Voltage parameter is greater than 4.89 V.

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

replace the K20 engine control module.

6. Verify the scan tool Throttle Position Sensor 2 Voltage parameter is greater than 4.97 V.

瀚慖f less than the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the K20 engine

control module.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage.

7. Connect a 3 A fused jumper wire between the throttle position sensor 2 signal circuit terminal F and the low reference circuit terminal C.

Verify the scan tool Throttle Position Sensor 2 Voltage parameter is less than 0.10 V.

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

replace the K20 engine control module.

8. If all circuits test normal, replace the Q38 throttle body assembly.

Repair Instructions

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

* 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)

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

programming, and setup