Friday, February 14, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1801

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1801



Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code



(DTC) Type Definitions)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Note: If other DTCs are set, diagnose those DTCs first.



1. Engine idling in Park, with parking brake applied and drive wheels chocked.



2. Perform the Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing



and Inspection/Initial Inspection and Diagnostic Overview/Transmission Fluid Level and Condition Check) to verify correct fluid level and



condition.



3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning (See: Transmission and Drivetrain/Automatic



Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/Control Solenoid Valve and Transmission Control



Module Assembly Cleaning) to dislodge debris and free up the valves.



Note: Perform a scan tool snapshot, during the road test.



4. Perform the Road Test (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Initial Inspection and



Diagnostic Overview/Road Test). Verify the transmission operation performs as indicated in the road test instructions.



5. Review the scan tool snapshot transmission data parameters. Verify the engine and transmission data parameters display the correct values in



all forward gear ranges:



* Engine Speed



* Vehicle Speed



* Transmission ISS



* Transmission OSS



* Shift Solenoid Valve 1



* Gear Command



6. Operate the vehicle within the Condition 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. Perform the Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component



Tests and General Diagnostics/Line Pressure Check). Verify the transmission line pressures are within the specified ranges.



瀚慖f not within the specified ranges, refer to Fluid Pressure High or Low (See: Transmission and Drivetrain/Automatic



Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/Fluid Pressure High or Low).



2. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly



Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids - Transmission and



Drivetrain/Actuators and Solenoids - A/T/Shift Solenoid/Service and Repair).



3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (See: Transmission and



Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/Control Solenoid Valve and



Transmission Control Module Assembly Solenoid Performance Test).



瀚慖f the Q8 control solenoid valve assembly does not pass the performance test, replace the Q8 control solenoid valve assembly.



4. Listed in the chart below, are conditions for each component that could set DTC P1751. Carefully inspect each component for that condition.



Repair or replace as necessary.



Repair Instructions



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

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