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Home >> Infiniti >> 2008 >> EX35 Base, RWD >> Repair and Diagnosis >> Steering >> Power Steering >> Steering Control System >> Component Diagnosis >> Engine Speed Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM ECM SELF-DIAGNOSIS 

    With CONSULT-III 

    1. Turn the ignition switch ON.

    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 continuity between ECM harness connector and power steering control unit harness connector.
      TERMINALS CONTINUITY REFERENCE

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

    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 damaged parts.

  3. CHECK ENGINE SPEED SIGNAL (1) 
    1. Connect ECM harness connectors.
    2. Check signal between ECM harness connector and ground with oscilloscope.
    TERMINALS VOLTAGE REFERENCE

    ECM - Condition Voltage (Approx.)
    Connector Terminal
    M107 110 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  4.

    NO: Replace ECM. Refer to DESCRIPTION .

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

    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 power steering control unit pin terminals for damage or loose connection with harness connector.
    • Check ECM pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Repair or replace damaged parts.

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