COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed engine cooling system, failed fan controller, failed engine coolant temperature sensor or other faults.
PROBABLE CAUSE
- Insufficient or deteriorated engine coolant
- Failed fan controller
- Failed engine coolant temperature sensor
- Failed thermostat
- Failed water pump
- Failed radiator core
- Failed engine-A/T-ECU
STEP 2. Check engine coolant
NOTE: If engine coolant level falls too early, check for leaky spots, and repair if necessary.
- Check engine coolant (Refer to GROUP 14 -
On-vehicle Service -
Engine
Coolant Leak Check
).
Q: Is the check result normal?
YES:
Go to Step 3 
.NO: Replace or add engine coolant.
STEP 4. MUT-II/III data list
- Item 21: Engine coolant temperature sensor
OK:
- Engine cold state: At ambient temperature (atmospheric temperature) or equivalent.
- Engine hot state: At 80 -
120°C
Q: Is the check result normal?
YES:
Go to Step 5 .NO: Check engine coolant temperature sensor system (Refer to Code No. P0115
).