SFI 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 are 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 interprets 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 turned ON or engine is running (3 trip detection logic)

  • Open or short 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 turned ON or engine is running (3 trip detection logic)

  • Short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM

Tech Tips


  • DTC P0117 and P0118 are detected when the engine idles for approximately 10 minutes.

  • When any of these DTCs are output, check the engine coolant temperature using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

Temperature Displayed Malfunction
-40°C (-40°F) Open circuit
140°C (284°F) or higher Short circuit

WIRING DIAGRAM

A01VF3SE02
*a Engine Coolant Temperature Sensor

CAUTION / NOTICE / HINT

Note

Perform electronic throttle learning after replacing the ECM Click here.

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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 USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    5. Read the value displayed on the tester.

      Standard value
      Between 75°C and 100°C (167°F and 212°F) with warm engine.
      Result
      Result Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      Between 75 and 100°C (167 and 212°F) C

      Tech Tips


      • If there is an open circuit, the intelligent tester indicates -40°C (-40°F).

      • If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.


    B

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)

    A01VM7KE02
    Text in Illustration
    *1 Engine Coolant Temperature Sensor
    *2 ECM
    *a

    Front view of wire harness connector

    (to Engine Coolant Temperature Sensor)

    1. Disconnect the engine coolant temperature sensor connector.

    2. Connect terminals 2 and 1 of the engine coolant temperature sensor wire harness side connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    7. Read the value displayed on the tester.

      Standard value
      140°C (284°F) or higher

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B33-2 - B87-12 (THW) Always Below 1 Ω
      B33-1 - B87-30 (ETHW) Always Below 1 Ω

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)

    A01VHTYE01
    Text in Illustration
    *1 Engine Coolant Temperature Sensor
    *2 ECM

    1. Disconnect the engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    6. Read the value displayed on the tester.

      Standard value
      -40°C (-40°F)

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B33-2 or B87-12 (THW) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR