SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P0117, P0118

DTC Code DTC Name
P0117 Engine Coolant Temperature Circuit Low Input
P0118 Engine Coolant Temperature Circuit High Input

DESCRIPTION

A thermistor is built into the engine coolant temperature sensor and changes its resistance value according to the engine coolant temperature. The structure of the sensor and connection to the ECM is the same as that of the intake air temperature sensor.

Tech Tips


  • When the engine coolant temperature sensor output is outside the normal range, the ECM determines this as a malfunction.

  • If DTC P0117 or P0118 is detected, the ECM performs engine control using an estimated engine coolant temperature calculated from the intake air temperature at the time of engine start and the intake air volume.

DTC No. DTC Detection Condition Trouble Area
P0117 Engine coolant temperature sensor output is less than -47°C (-53°F) for 0.5 seconds when ignition switch is in ON position or engine is running (3 trip detection logic)

  • Open in engine coolant temperature sensor circuit

  • Short to power source circuit

  • Engine coolant temperature sensor

  • ECM
P0118 Engine coolant temperature sensor output is more than 143°C (289°F) for 0.5 seconds when ignition switch is in ON position or engine is running (3 trip detection logic)

  • Short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM

Tech Tips

When DTC P0117 or P0118 is detected, check the engine coolant temperature by selecting Powertrain / Engine and ECT / Data List / Coolant Temp on the intelligent tester.

Temperature Displayed Malfunction
Less than -47°C (-53°F) Open or short to +B circuit
More than 143°C (289°F) Short to GND

WIRING DIAGRAM

A0136ZBE02

INSPECTION PROCEDURE

Note

After replace the ECM, perform electronic throttle learning Click here.

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE OF ENGINE COOLANT TEMPERATURE SENSOR


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester ON.

    3. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

    4. Read the value.

      Standard
      75°C to 97°C (167°F to 207°F) after warning up the engine.
      Result
      Temperature Displayed Proceed To
      Less than -47°C (-53°F) A
      More than 143°C (289°F) B
      Same as actual engine coolant temperature C

      Tech Tips


      • If there is an open circuit, the intelligent tester indicates less than -47°C (-53°F).

      • If there is a short to GND, the intelligent tester indicates more than 143°C (289°F).


    B

    CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    GO TO "CHECK FOR INTERMITTENT PROBLEMS"

    A

  2. CHECK WIRE HARNESS (CHECK FOR OPEN IN WIRE HARNESS)


    1. A0136B1E01

      Confirm good condition at engine coolant temperature sensor.

    2. Disconnect the B22 engine coolant temperature sensor connector.

    3. Connect terminals THW and B22 of the engine coolant temperature sensor wire harness side connector.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to ON and turn the intelligent tester ON.

    6. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

    7. Read the value.

      Standard
      143°C (289°F) or more

    8. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    NG

  3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. A0137VYE01

      Disconnect the B22 engine coolant temperature sensor connector.

    2. Disconnect the B26 ECM connector.

    3. Measure the resistance.

      Standard resistance
      Tester Connection Specified Condition
      THW (B22-2) - THW (B26-9) Below 1 Ω
      E2 (B22-1) - E2 (B26-32) Below 1 Ω

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM

  4. CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS)


    1. A0136KSE02

      Disconnect the B22 engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON and turn the intelligent tester ON.

    4. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

    5. Read the value.

      Standard
      -47°C (-53°F) or less

    6. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    NG

  5. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. A0137VYE06

      Disconnect the B22 engine coolant temperature sensor connector.

    2. Disconnect the B26 ECM connector.

    3. Measure the resistance.

      Standard resistance
      Tester Connection Specified Condition
      THW (A8-4) or THW(B26-32) - body ground 10 kΩ or higher

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM