Saturday, March 21, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1510

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1510



DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LAU)



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 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 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