2010 Cadillac CTS Sedan AWD V6-3.0L Page 1980

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1980



3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the



conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing



1. Ignition OFF, disconnect the X1 16-way harness connector at the T12 automatic transmission assembly.



2. Ignition OFF, test for less than 5 ohms on the vehicle harness connector X1 terminal 5 and ground at the transmission case.



瀚慖f greater than then specified valve, test the ground circuit for an open/high resistance.



3. Ignition ON, verify that a test lamp illuminates at connector X1 vehicle harness side and the following terminals:



* Terminal 4 and ground at the transmission case



* Terminal 12 and ground at the transmission case



瀚慖f the test lamp does not illuminate on any circuit, test the ignition or B+ circuit for a short to ground or an open/high resistance.



4. If all circuits test normal, replace the Q8 control solenoid valve assembly.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and



Inspection/Programming and Relearning/Service Fast Learn Adapts) following all transmission related repairs.



P2544



DTC P2544



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 P2544



- Transmission Torque Request Circuit



Circuit/System Description



To improve shift feel, the transmission control module (TCM) may request that the engine control module (ECM) reduce engine torque during shift



events. When such a request is received, the ECM responds by retarding the injection timing and notifying the TCM that the request has succeeded.



If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.



The torque reduction request is sent to the ECM through GMLAN.



Conditions for Running the DTC



* The ignition is ON for greater than 3 seconds.



* The ignition voltage is between 10-18 volts.



* The DTCs run continuously once the above condition is met for greater than 10 mS.



Conditions for Setting the DTC



The ECM detects an invalid signal from the TCM for greater than 1 second, or a cumulative of 10 seconds.



Action Taken When the DTC Sets



DTC P2544 is a Type C DTC.



Conditions for Clearing the DTC



DTC P2544 is a Type C DTC.

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