Circuit/System Verification

Ignition ON.
Verify the scan tool Engine Coolant Temperature parameter was less than 125° C (257° F) when DTC set by reviewing the scan tool Freeze Frame/Failure Records.
- If 125° C (257° F) or greater
  Refer to Engine Overheating .
- If less than 125° C (257° F)
Verify the transmission fluid level and condition is correct. Refer to Transmission Fluid Level and Condition Check .
- If the transmission fluid level and condition is not correct
  Repair as necessary.
- If the transmission fluid level and condition is correct
Clear the TCM DTCs with a scan tool.
Operate the vehicle until normal engine temperature is reached.
Verify the scan tool Transmission Fluid Temperature parameter is less than 140° C (284° F).
- If 140° C (284° F) or greater
1. Ignition OFF.
2. Verify the conditions listed below do not exist:
  - Obstructions to the airflow to the radiator or transmission
  - Radiator damage
  - Transmission cooler damage
  - Transmission cooler pipe kinked or damaged
  - If a condition exists, repair or replace as necessary.
  - If no condition exists, refer to Transmission Fluid Cooler Flow Test and Flushing .
- If less than 140° C (284° F)
Verify DTC P0634 does not set.
- If the DTC sets
  Replace the Q8 Control Solenoid Valve Assembly.
- If the DTC does not set
Operate the vehicle within the conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Record data.
Verify the DTC does not set.
- If the DTC sets
  Replace the Q8 Control Solenoid Valve Assembly.
- If the DTC does not set
All OK.