2010 Cadillac CTS Sedan AWD V6-3.0L Page 1546

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