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Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0183 >> DTC P0117, P0118: ECT Sensor >> Diagnosis Procedure
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Diagnosis Procedure

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

      Is the inspection result normal? 

      YES: GO TO 2.

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

  2. 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.
      ECT sensor ECM Continuity
      Connector Terminal Connector Terminal
      F17 2 F110 40 Existed
    4. Also check harness for short to ground and short to power.

      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 ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION (ENGINE COOLANT TEMPERATURE SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Replace engine coolant temperature sensor. Refer to "EXPLODED VIEW ".

  4. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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