Sunday, November 1, 2020

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1607

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