2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1503
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuel Pressure Sensor Replacement - Fuel Feed Pipe (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure
Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Feed Pipe)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for fuel pump control module replacement, setup,
and programming
P0642
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
DTC P0651
- 5 V Reference 2 Circuit
DTC P0652
- 5 V Reference 2 Circuit Low Voltage
DTC P0653
- 5 V Reference 2 Circuit High Voltage
DTC P0697
- 5 V Reference 3 Circuit
DTC P0698
- 5 V Reference 3 Circuit Low Voltage
DTC P0699
- 5 V Reference 3 Circuit High Voltage
Circuit/System Description
The engine control module (ECM) has 3 internal 5 V reference circuits. Each internal reference circuit provides external 5 V reference circuits for
more than one sensor. A short to ground or short to voltage on one external 5 V reference circuit can affect all the components connected to the
same internal 5 V reference circuit.
Conditions for Running the DTC
* The ignition is ON for greater than 3 s.
* DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 run continuously when the above condition is met.
Conditions for Setting the DTC
The 5 V reference circuit voltage is above or below a predetermined threshold for greater than 1 s or for a cumulative of 10 s.
Action Taken When the DTC Sets
DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.
