SFI SYSTEM, Diagnostic DTC:P0118

DTC Code DTC Name
P0118 Engine Coolant Temperature Sensor 1 Circuit High

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0118 Engine Coolant Temperature Sensor 1 Circuit High

DTC Detection Condition


    Enable Criteria

  • Engine running


    Malfunction Criteria

  • Voltage at ECU 4.892 V or higher for time 0.5 seconds or more


    Diagnostic Mask

  • The MIL will be illuminated if these faults are present for 2 consecutive trips


    Monitor

  • Continuous


    Potential failure modes

  • Signal open circuit

  • Sensor failure

  • Open in engine coolant temperature sensor circuit

  • Wire harness or connector

  • Engine coolant temperature sensor

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

The engine coolant temperature sensor is a thermistor device which changes resistance with temperature.

As coolant temperature decreases the thermistor resistance value increases, and conversely as coolant temperature increases so the thermistor resistance value decreases.

WIRING DIAGRAM

Refer to DTC P0117.

Click here

CAUTION / NOTICE / HINT

Tech Tips


  • If DTC P0117 is stored, check that the engine does not overheat (the DTC P0117 may be stored due to engine overheating).

  • Read freeze frame data using the GTS. 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 GTS (COOLANT TEMP)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the value displayed on the GTS.

      Standard Value
      Between 75°C and 100°C (167°F and 212°F) with warm engine.
      Result
      Result Proceed to
      140°C (284°F) A
      Between 75°C and 100°C (167°F and 212°F) B

      Tech Tips


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

      • If there is a short circuit, the GTS indicates 140°C (284°F).


    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)

    B0045HLC04
    *1 Engine Coolant Temperature Sensor
    *2 ECM

    1. Disconnect the B33 engine coolant temperature sensor connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. Read the value displayed on the GTS.

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

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the B142 ECM connector.

    2. Disconnect the B33 engine coolant temperature sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B142-31 (THW) or B33-2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR