2010 Cadillac CTS Sedan AWD V6-3.0L Page 1546
P0641, P0651, P0697, or P06A3 (ECM)
DTC P0641, P0651, P0697, or P06A3 (ECM, LF1)
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 P0651
- 5 V Reference 2 Circuit
DTC P0697
- 5 V Reference 3 Circuit
DTC P06A3
- 5 V Reference 4 Circuit
Circuit/System Description
The engine control module (ECM) has 4 5 V reference circuits. The ECM provides the 5 V reference to various sensors. Each reference circuit
provides a 5 V reference for more than one sensor. An open, short to ground, or short voltage on one of the 5 V reference circuits can affect all the
components connected to that 5 V reference circuit. The ECM monitors the voltage on the 5 V reference circuits.
Conditions for Running the DTC
DTCs P0641, P0651, P0697, P06A3 run continuously when the ignition is ON.
Conditions for Setting the DTC
The 5 V reference circuit voltage is greater or less than a predetermined threshold.
Action Taken When the DTC Sets
DTCs P0641, P0651, P0697, and P06A3 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0641, P0651, P0697, and P06A3 are Type A DTCs.
Diagnostic Aids
DTC P0641
The 5 V reference 1 circuit provides 5 V to the following sensors:
* B150 fuel tank pressure (FTP) sensor
* B17 barometric pressure (BARO) sensor
* B37 engine oil pressure (EOP) sensor
* B47B fuel rail pressure (FRP) sensor
* B1 A/C refrigerant pressure sensor
* All four B23 camshaft position (CMP) sensors
DTC P0651
The 5 V reference 2 circuit provides 5 V to the following sensors:
* B25B clutch pedal position (CPP) sensor, if equipped
* B26 crankshaft position (CKP) sensor
