Inspection Procedure 19: Overheating




COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


Q. Is diagnosis code set?

Inspection chart for diagnosis code (Refer to ).
Go to Step 2.

STEP 2. 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 14A - On-vehicle Service - Engine Coolant Leak Check ).

Q. Is the check result normal?

Go to Step 3.
Replace or fill the engine coolant.

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



  • Item 14: Cooling fan
OK: Fan motor rotates at high speed.

Q. Is the check result normal?

Go to Step 4.
Check fan control relay system (Refer to GROUP 14A - Troubleshooting - Symptom Procedure - Radiator Fan and Condenser Fan Do Not Operate <4B1-Except PHEV, 4J1> ).

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



  • Item 6: 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. Check code No. P0117: engine coolant temperature sensor circuit low input (Refer to ). Check code No. P0118: engine coolant temperature sensor circuit high input (Refer to ).

STEP 5. Check thermostat.



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

Q. Is the check result normal?

Go to Step 6.
Replace the thermostat.

STEP 6. Check water pump.



  • Check water pump (Refer to GROUP 14A - On-vehicle Service - Water Pump Coolant Leak Check ).

Q. Is the check result normal?

Replace the radiator.
Replace the water pump.