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 -40°C (-40°F) for 0.5 seconds when ignition switch is ON 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 140°C (284°F) for 0.5 seconds when ignition switch is ON 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 -40°C (-40°F) Open or short to +B circuit
More than 140°C (284°F) Short to GND

WIRING DIAGRAM

A01383KE05

INSPECTION PROCEDURE

Note

After replacing 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 USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the value.

      Standard
      75°C to 97°C (167°F to 207°F) after warming up the engine.
      Result
      Result Proceed to
      Less than -40°C (-40°F) A
      More than 140°C (284°F) B
      Same as actual engine coolant temperature C

      Tech Tips


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

      • If there is a short to GND, the intelligent tester indicates more than 140°C (284°F).


    B

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

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. A0136B1E05

      Confirm good condition at engine coolant temperature sensor.

    2. Disconnect the engine coolant temperature sensor connector.

    3. Connect terminals THW and E2 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 tester on.

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

    7. Read the value.

      Standard
      140°C (284°F) or more

    8. Reconnect the engine coolant temperature sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

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


    1. A01373PE01

      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
      B22-2 (THW) - B25-12 (THW) Always Below 1 Ω
      B22-1 (E2) - B25-30 (E2) Always Below 1 Ω

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

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


    1. A0136KXE07

      Disconnect the engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

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

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

    5. Read the value.

      Standard
      -40°C (-40°F) or less

    6. Reconnect the engine coolant temperature sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

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


    1. A01373PE02

      Disconnect the engine coolant temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B22-2 (THW) or B25-12 (THW) - Body ground Always 10 kΩ or higher

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here