Code No. P0117: Engine Coolant Temperature Sensor Circuit Low Input




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSTIC PROCEDURE


STEP 1. 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 ).
Go to Step 2.

STEP 2. 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 3.
Repair or replace the connector, or replace the engine coolant temperature sensor.

STEP 3. 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 6.
Go to Step 4.

STEP 4. Check harness between engine coolant temperature sensor connector terminal and engine-ECU connector terminal WTS.



  • Check output line for short circuit.

Q. Is the check result normal?

Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 5. 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 6. 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 8.
Go to Step 7.

STEP 7. Check harness between engine coolant temperature sensor connector terminal and engine-ECU connector terminal WTSE.



  • Check earthing line for damage.

Q. Is the check result normal?

Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

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



  • Check output line for damage.

Q. Is the check result normal?

Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.