2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1506
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.
Conditions for Clearing the DTC
DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.
Diagnostic Aids
The 5 V reference 1, 2, and 3 circuits provide 5 V to the following sensors:
P0641, P0642, and P0643
* Economy mode switch
* Turbocharger pressure sensor
* Secondary air injection (AIR) pressure sensor
* Engine oil pressure (EOP) sensor
* Fuel tank pressure sensor
P0651, P0652, and P0653
* All four camshaft position sensors
* Accelerator pedal position (APP) sensor 1
P0697, P0698, and P0699
* Throttle position sensor 1 and 2
* Crankshaft position sensor
* Accelerator pedal position (APP) sensor 2
* A/C refrigerant pressure sensor
It may be possible to locate the fault by disconnecting one component at a time from the 5 V reference circuit while viewing the 5 V Reference
Circuit parameter on the scan tool. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all
5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.
