Inspection Procedure 15: Overheating


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

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

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

STEP 2. Check the radiator fan.

  • Check the radiator fan (Refer to GROUP 14 - Troubleshooting ).

Q. Is the check result normal?
Go to Step 3.
Repair.

STEP 3. Check engine coolant.
note When the engine coolant level is too low, check for any section that cases leakage 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 4.
Replace or fill the engine coolant.

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

  • Item 7: 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?
Go to Step 5.
Check engine coolant temperature sensor system (Refer to Code No. P0117 , Refer to Code No. P0118 ).

STEP 5. Check thermostat.

  • Check thermostat (Refer to GROUP 14 - Thermostat and Thermostat Case <4N1> - 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.