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Inspection Procedure
20: Overheating
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COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed engine cooling system, failed fan controller,
failed engine coolant temperature sensor or other faults.
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PROBABLE CAUSE
- Insufficient or deteriorated engine coolant
- Failed engine coolant temperature sensor
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| STEP 1. MUT-II/III diagnosis code Q: Diagnosis code set?
YES:
Inspection chart for diagnosis code (Refer to  ).
NO:
Go to Step 2  .
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| 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 ).
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Replace or add engine coolant.
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| STEP 3. MUT-II/III actuator test OK: Fan motor rotating
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Check fan control relay system (Refer to Inspection Procedure 25 ).
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| 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 ).
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| STEP 5. Check thermostat. - Check thermostat (Refer to GROUP 14 -
Thermostat ).
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Replace thermostat.
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| STEP 6. Check water pump. Q: Is the check result normal?
YES:
Replace radiator.
NO:
Replace water pump.
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