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Home >> Infiniti >> 2011 >> QX56 AWD >> Repair and Diagnosis >> Steering >> Power Steering >> Power Steering Control System >> DTC/Circuit Diagnosis >> Vehicle Speed Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM COMBINATION METER SELF-DIAGNOSIS

    With CONSULT-III 

    Perform "METER/M&A" self-diagnosis. Refer to "CONSULT-III FUNCTION ".

    Is any DTC detected? 

    YES: Check the DTC.

    NO: GO TO 2.

  2. CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT
    1. Turn the ignition switch OFF.
    2. Disconnect combination meter harness connector.
    3. Disconnect power steering control unit harness connector.
    4. Check the continuity between combination meter harness connector and power steering control unit harness connector.
      CONTINUITY SPECIFICATION

      Combination meter Power steering control unit Continuity
      Connector Terminal Connector Terminal
      M34 30 M108 8 Existed
    5. Check the continuity between power steering control unit harness connector and ground.
      CONTINUITY SPECIFICATION

      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 (COMBINATION METER)
    1. Connect combination meter harness connector.
    2. Check the combination meter input/output standard values. Refer to "REFERENCE VALUE ".

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Replace combination meter Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT)
    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 SPECIFICATION

      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).
      G07025315Courtesy of NISSAN MOTOR CO.

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Replace power steering control unit. Refer to "REMOVAL AND INSTALLATION ".

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