2010 Cadillac CTS Sedan AWD V6-3.0L Page 1607
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 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
* The ignition is ON for more 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 greater or less than a predetermined threshold.
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
DTC P0641, P0642, and P0643
The 5 V reference 1 circuit provides 5 V to the following sensors:
* B150 fuel tank pressure sensor
* B25B clutch pedal position sensor, if equipped
* B37B engine oil pressure sensor
* B1 A/C refrigerant pressure sensor
DTC P0651, P0652, and P0653
The 5 V reference 2 circuit provides 5 V to the following sensors:
* All four B23 camshaft position sensors
* B107 accelerator pedal position (APP) sensor 1
DTC P0697, P0698, and P0699
