Circuit/System Verification

Ignition ON.
Verify DTC P0480, P0691 or P0692 is not set.
- If a DTC is set
  Refer to DTC P0480, P0691 or P0692 (LTG) and/or DTC P0480, P0691 or P0692 (LGW or LGX) .
- If no DTCs is set
Verify the cooling fan operates at each available speed as commanded with a scan tool.
NOTE: A short delay occurs before the ECM changes the cooling fan speed.
- 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 that the customer experienced and verify the DTC does not set.
- If the DTC sets
  Refer to Symptoms - Engine Cooling .
- If the DTC does not set
All OK