2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1505

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1505

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

P0643

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.

DTC Descriptors

DTC P0641

- 5 V Reference 1 Circuit

DTC P0642

- 5 V Reference 1 Circuit Low Voltage

DTC P0643

- 5 V Reference 1 Circuit High Voltage