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Home >> Infiniti >> 2008 >> EX35 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0137 To P0448 >> P0197, P0198 EOT Sensor >> Diagnosis Procedure
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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 EOT SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect engine oil temperature (EOT) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between EOT sensor harness connector and ground.
      VOLTAGE SPECIFICATIONS

      EOT sensor Ground Voltage (V)
      Connector Terminal
      F38 1 Ground Approx. 5

    Is the inspection result normal? 

    YES: GO TO 3.

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

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

      EOT sensor ECM Continuity
      Connector Terminal Connector Terminal
      F38 2 F102 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 or short to ground or short to power in harness or connectors.

  4. CHECK ENGINE OIL TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace engine oil temperature sensor.

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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