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Home >> Infiniti >> 2012 >> FX35 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Security Control System) >> DTC/Circuit Diagnosis >> DTC B2603: Shift Position Status >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC WITH TCM

    Check "Self diagnostic result" with CONSULT-III. Refer to "DTC INDEX ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace the malfunctioning parts.

  2. CHECK TRANSMISSION RANGE SWITCH CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector and BCM connector.
    3. Check continuity between TCM harness connector and BCM harness connector.
      CONTINUITY SPECIFICATION

      TCM BCM Continuity
      Connector Terminal Connector Terminal
      F51 9 M123 140 Existed
    4. Check continuity between TCM harness connector and ground.
    CONTINUITY SPECIFICATION

    TCM Ground Continuity
    Connector Terminal
    F51 9 Not existed

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace harness or connector.

  3. CHECK A/T SHIFT SELECTOR POWER SUPPLY
    1. Disconnect A/T shift selector (detention switch) connector.
    2. Check voltage between A/T shift selector (detention switch) harness connector and ground.
    VOLTAGE SPECIFICATION

    (+) (-) Voltage (V) (Approx.)
    A/T shift selector (detention switch)
    Connector Terminal
    M137 10 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. CHECK A/T SHIFT SELECTOR POWER SUPPLY CIRCUIT
    1. Disconnect BCM connector.
    2. Check continuity between A/T shift selector (detention switch) harness connector and BCM harness connector.
      CONTINUITY SPECIFICATION

      A/T shift selector (detention switch) BCM Continuity
      Connector Terminal Connector Terminal
      M137 10 M122 96 Existed
    3. Check continuity between A/T shift selector (detention switch) harness connector and ground.
    CONTINUITY SPECIFICATION

    A/T shift selector (detention switch) Ground Continuity
    Connector Terminal
    M137 10 Not existed

    Is the inspection result normal? 

    YES: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness or connector.

  5. CHECK A/T SHIFT SELECTOR CIRCUIT
    1. Disconnect BCM connector and IPDM E/R connector.
    2. Check continuity between A/T shift selector (detention switch) harness connector and BCM harness connector.
      CONTINUITY SPECIFICATION

      A/T shift selector (detention switch) BCM Continuity
      Connector Terminal Connector Terminal
      M137 11 M122 99 Existed
    3. Check continuity between A/T shift selector (detention switch) harness connector and ground.
    CONTINUITY SPECIFICATION

    A/T shift selector (detention switch) Ground Continuity
    Connector Terminal
    M137 11 Not existed

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair or replace harness or connector.

  6. CHECK A/T SHIFT SELECTOR (DETENTION SWITCH)

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Replace A/T shift selector. Refer to "REMOVAL AND INSTALLATION ".

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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