Code No. P0217: Engine Coolant Over Temperature


FUNCTION



TROUBLE JUDGEMENT


Check Condition
Judgement Criterion

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. 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 2.
Replace or fill the engine coolant (Refer to GROUP 14 - On-vehicle Service - Engine coolant change ).

STEP 2. Check cooling fan and fan clutch.

  • Check blades for damage and cracks.
  • Check for cracks and damage around bolt holes in fan hub.
  • Check to ensure that fluid in cooling fan clutch is not leaking at case joint and seals. If fluid quantity decreases due to leakage, fan speed will decrease and engine overheating might result.
  • When a fan attached to an engine is turned by hand, it should give a sense of some resistance. If fan turns lightly, it is faulty.

Q. Is the check result normal?
Go to Step 3.
Replace the cooling fan or cooling fan clutch.

STEP 3. Check thermostat.

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

Q. Is the check result normal?
Go to Step 4.
Replace the thermostat.

STEP 4. Check water pump.

  • Check water pump.

Q. Is the check result normal?
Go to Step 5.
Replace the water pump.

STEP 5. Check radiator.

  • Check radiator.

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

STEP 6. Perform resistance measurement at engine coolant temperature sensor connector.

  • Engine coolant temperature sensor connector check.
  • Disconnect connector, and measure at sensor side.
  • Resistance between terminals.
OK:
    Engine coolant temperature at -20°C: 14 - 17 kΩ
    (Engine coolant temperature at 0°C: 5.1 - 6.5 kΩ)
    Engine coolant temperature at 20°C: 2.1 - 2.7 kΩ
    (Engine coolant temperature at 40°C: 0.9 - 1.3 kΩ)
    (Engine coolant temperature at 60°C: 0.48 - 0.68 kΩ)
    (Engine coolant temperature at 80°C: 0.26 - 0.36 kΩ)

Q. Is the check result normal?
Go to Step 7.
Replace the engine coolant temperature sensor.

STEP 7. Perform voltage measurement at engine coolant temperature sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: "ON"
  • Voltage between terminal engine-ECU WTS line and body earth.
OK: 4.5 - 4.9 V

Q. Is the check result normal?
Go to Step 10.
Go to Step 8.

STEP 8. Check harness between engine coolant temperature sensor connector terminal and engine-ECU connector terminal WTS.

  • Check output line for open circuit and damage.

Q. Is the check result normal?
Go to Step 9.
Repair or replace the connector, or repair the damaged harness wire.

STEP 9. 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?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.

STEP 10. Perform resistance measurement at engine coolant temperature sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU WTSE line and body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 9.
Go to Step 11.

STEP 11. Check harness between engine coolant temperature sensor connector terminal and engine-ECU connector terminal WTSE.

  • Check earthing line for open circuit and damage.

Q. Is the check result normal?
Go to Step 9.
Repair the damaged harness wire.