Inspection Procedure 27: Overheating


COMMENT ON TROUBLE SYMPTOM



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2 .

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?
Go to Step 3 .
Replace or add engine coolant.

STEP 3. M.U.T.-III actuator test

  • Refer to Actuator Test .

    1. Item No. 8: Radiator fan (Hi)
    2. Item No. 9: Radiator fan (Low)
OK: Fan motor rotating

Q. Are the check results normal?
Go to Step 4 .
Check engine cooling (Refer to GROUP 14 -Trouble Shooting-Inspection Chart for Trouble Symptom ).

STEP 4. M.U.T.-III data list

  • Refer to Data List Reference Table .

    1. Item No. 8: Engine coolant temperature sensor
OK:
    Engine cold state: At ambient temperature (atmospheric temperature) or equivalent.
    Engine hot state: At 80 - 120°C

Q. Are the check results normal?
Go to Step 5 .
Check engine coolant temperature sensor system (Refer to Code No. P0115 ).

STEP 5. Check thermostat.

  • Check thermostat (Refer to GROUP 14 - Thermostat - Thermostat Inspection ).

Q. Is the check result normal?
Go to Step 6 .
Replace the thermostat.

STEP 6. Check water pump.

  • Check water pump.

Q. Is the check result normal?
Replace the radiator.
Replace the water pump.