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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 >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK POWER SUPPLY
    1. Turn the ignition switch OFF.
    2. Disconnect power steering control unit harness connector.
    3. Check the voltage between power steering control unit harness connector and ground.
      VOLTAGE CHART

      Power steering control unit - Voltage
      Connector Terminal
      M108 3 Ground 0 V
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between power steering control unit harness connector and ground.
    VOLTAGE CHART

    Power steering control unit - Voltage
    Connector Terminal
    M108 3 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Check the following. If any items are damaged, repair or replace damaged parts.

    • 10A fuse (#45) open
    • Harness for short or open between ignition switch and power steering control unit harness connector No. 3 terminal.
    • Ignition switch. Refer to "EXPLODED VIEW ".
  2. CHECK GROUND CIRCUIT
    1. Turn the ignition switch OFF.
    2. Check the continuity between power steering control unit harness connector and ground.
    CONTINUITY CHART

    Power steering control unit - Continuity
    Connector Terminal
    M108 6 Ground Existed

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace error-detected parts.

  3. CHECK TERMINALS AND HARNESS CONNECTORS

    Check the power steering control unit 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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