Circuit/System Verification

Ignition ON.
Verify DTC P0480, P0481, P0691, P0692, P0693, or P0694 is not set.
- If a DTC is set
  Refer to DTC P0480, P0481, P0691, P0692, P0693, or P0694 .
- If no DTCs is set

NOTE:

A short delay occurs before the ECM changes the cooling fan speed.

Verify the cooling fan operates at each available speed as commanded with a scan tool.
- Cooling fan does not operate
  Refer to Cooling Fan Inoperative .
- Cooling fan operates
Verify that the engine does not overheat.
- Engine overheats
  Refer to Engine Overheating .
- Engine does not overheat
Operate the vehicle within the Conditions for Running the DTC.
- If the DTC sets
  Refer to Symptoms - Engine Cooling .
- If the DTC does not set
All OK