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Home › Infiniti › 2010 › M35 Base › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS U0101 To P0128 › DTC P0117, P0118: ECT Sensor › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connections M16, M70. Refer to "GROUND INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connections.

  2. CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect ECT sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECT sensor harness connector and ground.
      CONNECTOR TERMINAL VOLTAGE CHART

      ECT sensor Ground Voltage (V)
      Connector Terminal
      F13 1 Ground Approx. 5
      Fig 1: Checking Voltage Between ECT Sensor Terminal 1 And Ground
      G04874990Courtesy of NISSAN MOTOR CO., U.S.A.

      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.
      CONNECTOR TERMINAL CONTINUITY CHART

      ECT sensor ECM Continuity
      Connector Terminal Connector Terminal
      F13 2 F106 84 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 ECT SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace ECT sensor.

  5. CHECK INTERMITTENT INCIDENT

    Refer to "DESCRIPTION ".

    INSPECTION END

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