Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.

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 scan tool TCM Temperature parameter is less than 146°C (295°F).
- If 146°C (295°F) or greater
  Replace the Q8 control solenoid valve assembly.
- If less than 146°C (295°F)
Verify correct fluid level and condition. Refer to Transmission Fluid Level and Condition Check .
Clear the DTCs from the TCM using a scan tool.
Operate the vehicle within the conditions for running and setting the DTC until normal engine temperature is reached.
Verify the scan tool Transmission Fluid Temperature parameter is less than 140°C (284°F) and DTC P0634 did not set.
- If 140°C (284°F) or greater
  Inspect the transmission cooling system for obstructions to the airflow of the radiator or transmission due to debris, kinked or damaged transmission fluid lines, or damage to the transmission cooler.
- If problems with cooling system are found, repair or replace as necessary.
- If no problems are found, refer to Transmission Fluid Cooler Flushing and Flow Test .
- If less than 140°C (284°F) and DTC P0634 set
  Replace the Q8 control solenoid valve assembly.
- If less than 140°C (284°F) and DTC P0634 did not set
After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, refer to Testing for Intermittent Conditions and Poor Connections .