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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

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