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Home >> Infiniti >> 2010 >> FX50 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (VK50VE) - DTC U0101, U0113, U1003, U1001, U1024 & P0011 Through P0159 >> DTC P0117, P0118: ECT Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in CIRCUIT INSPECTION .

      Is the inspection result normal? 

      YES: GO TO  2.

      NO: Repair or replace ground connection.

  2. CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect engine coolant temperature (ECT) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECT sensor harness connector and ground.
      VOLTAGE REFERENCE TABLE

      ECT sensor Ground Voltage (V)
      Connector Terminal
      F17 1 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECT sensor harness connector and ECM harness connector.
      CONTINUITY REFERENCE TABLE

      ECT sensor ECM Continuity
      Connector Terminal Connector Terminal
      F17 2 F110 23 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  4. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: Replace engine coolant temperature sensor.

  5. CHECK INTERMITTENT INCIDENT 

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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