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Home >> Infiniti >> 2009 >> G37 Base, 2D Convertible >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System -- Convertible >> DTC/Circuit Diagnosis >> Engine Speed Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM ECM SELF-DIAGNOSIS

    With CONSULT-III 

    1. Turn the ignition switch ON.
      CAUTION: Never start the engine
    2. Perform ECM self-diagnosis. Refer to "CONSULT-III FUNCTION ".

    Is any DTC detected? 

    YES: Check the DTC.

    NO: GO TO 2.

  2. CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT
    1. Turn the ignition switch OFF.
    2. Disconnect ECM harness connectors.
    3. Disconnect power steering control unit harness connector.
    4. Check the continuity between ECM harness connector and power steering control unit harness connector.
      CONTINUITY CHART

      ECM Power steering control unit Continuity
      Connector Terminal Connector Terminal
      M107 110 M108 10 Existed
    5. Check the continuity between power steering control unit harness connector and ground.
    CONTINUITY CHART

    Power steering control unit - Continuity
    Connector Terminal
    M108 10 Ground Not existed

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace error-detected parts.

  3. CHECK ENGINE SPEED SIGNAL (1)
    1. Connect ECM harness connectors.
    2. Turn the ignition switch ON.
    3. Check the signal between ECM harness connector and ground with oscilloscope.
    VOLTAGE CHART

    ECM - Condition Voltage (Approx.)
    Connector Terminal
    M107 110 Ground Engine is running
    • Warm-up condition
    • Idle speed
    G05887071Courtesy of NISSAN MOTOR CO., U.S.A.
    Engine is running
    • Warm-up condition
    • Engine speed: Approx. 2,000 RPM
    G05729713Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Replace ECM. Refer to "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : DESCRIPTION ".

  4. CHECK ENGINE SPEED SIGNAL (2)
    1. Turn the ignition switch OFF.
    2. Connect power steering control unit harness connector.
    3. Check the signal between power steering control unit harness connector and ground with oscilloscope.
    VOLTAGE CHART

    Power steering control unit - Condition Voltage (Approx.)
    Connector Terminal
    M108 10 Ground Engine is running
    • Warm-up condition
    • Idle speed
    G05729712Courtesy of NISSAN MOTOR CO., U.S.A.
    Engine is running
    • Warm-up condition
    • Engine speed: Approx. 2,000 RPM
    G05729713Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace power steering control unit. Refer to "EXPLODED VIEW ".

  5. CHECK TERMINALS AND HARNESS CONNECTORS
    • Check the power steering control unit pin terminals for damage or loose connection with harness connector.
    • Check the ECM pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Repair or replace error-detected parts.

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