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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 >> Vehicle Speed Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM UNIFIED METER AND A/C AMP. SELF-DIAGNOSIS

    With CONSULT-III 

    1. Turn the ignition switch ON.
    2. Perform unified meter and A/C amp. self-diagnosis. Refer to "CONSULT-III FUNCTION (METER/M&A) ".

    Is any DTC detected? 

    YES: Check the DTC.

    NO: GO TO 2.

  2. CHECK HARNESS BETWEEN UNIFIED METER AND A/C AMP. AND POWER STEERING CONTROL UNIT
    1. Turn the ignition switch OFF.
    2. Disconnect unified meter and A/C amp. harness connector.
    3. Disconnect power steering control unit harness connector.
    4. Check the continuity between unified meter and A/C amp. harness connector and power steering control unit harness connector.
      CONTINUITY CHART

      Unified meter and A/C amp. Power steering control unit Continuity
      Connector Terminal Connector Terminal
      M66 8 M108 8 Existed
    5. Check the continuity between power steering control unit harness connector and ground.
    CONTINUITY CHART

    Power steering control unit - Continuity
    Connector Terminal
    M108 8 Ground Not existed

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace error-detected parts.

  3. CHECK VEHICLE SPEED SIGNAL (1)
    1. Connect unified meter and A/C amp. harness connector.
    2. Check the unified meter and A/C amp. input/output standard values. Refer to "REFERENCE VALUE ".

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Replace unified meter and A/C amp. Refer to "EXPLODED VIEW ".

  4. CHECK VEHICLE 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 8 Ground Vehicle speed: 40 km/h (25 MPH)
    CAUTION: Check air pressure of tire under standard condition.
    NOTE: The maximum voltage varies depending on the specification (destination unit).
    G05223700Courtesy 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 unified meter and A/C amp. 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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