Saturday, October 3, 2020

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1694

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1694



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)



Description and Operation



* Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and



Operation/Electronic Component Description)



* Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and



Operation/Transmission General Description)



* Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and



Operation/Transmission Component and System Description)



DTC Type Reference



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



Special Tools



DT-47825-10 - Jumper Harness



Circuit/System Verification



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



2. Monitor the Transmission Fluid Pressure Switch 1, Transmission Fluid Pressure Switch 3, Transmission Fluid Pressure Switch 4, and



Transmission Fluid Pressure Switch 5 parameters with a scan tool.



3. Place the gear select lever in Park, Reverse, and Neutral range. Verify the TFP switch parameter states are correct for each range. Refer to



Transmission Fluid Pressure Switch Logic (See: Specifications/Mechanical Specifications/Automatic Transmission/Transaxle/System



Specifications/Transmission Fluid Pressure Switch Logic).



4. Place the gear select lever in Drive range. Command the shift transmission with a scan tool through all forward ranges. Verify the TFP switch



parameter states are correct for each range. Refer to Transmission Fluid Pressure Switch Logic (See: Specifications/Mechanical



Specifications/Automatic Transmission/Transaxle/System Specifications/Transmission Fluid Pressure Switch Logic).



5. Operate the vehicle within the conditions for running the DTC to verify the TDC 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



Note: You must perform the Circuit/System Verification first.



1. Ignition OFF. Remove the Q8 control solenoid valve assembly. Refer to Control Valve Body Assembly Removal (See: Transmission and



Drivetrain/Automatic Transmission/Transaxle/Service and Repair/Overhaul/6L45 Transmission/5. Control Valve Body Assembly Removal).



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



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



Module Assembly Inspection).



3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.



4. Connect the DT-47825-10 - jumper harness between the vehicle wire harness electrical connector, and the Q8 control solenoid valve



assembly electrical connector.



5. Ignition ON, verify with a scan tool that each TFP switch parameters changes states when gently pushing on each TFP switch with the eraser



end of a pencil.



瀚慖f any TFP switch parameter does not change states, replace the Q8 control solenoid valve assembly.



Repair Instructions



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



* Control solenoid valve assembly replacement. Refer to Control Module References (See: Testing and Inspection/Programming and



Relearning) for replacement, setup, and programming.



* 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.



P0878



DTC P0877 or P0878



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

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