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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Security Control System (DTC/Circuit Diagnosis) (Except Hybrid)) >> DTC/Circuit Diagnosis >> DTC B2603: Shift Position >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

  1. CHECK CVT SHIFT SELECTOR SWITCH FUNCTION

    1. Turn ignition switch ON.
    2. Select "DETE/CANCEL SW" and "SFT PN/N SW" in DATA MONITOR mode with CONSULT.
    3. Check "DETE/CANCEL SW" and "SFT PN/N SW" indication under the following conditions.
      Monitor item Condition Indication
      DETE/CANCEL SW CVT Shift selector In any position other than P (Park) OFF
      P (Park) ON
      SFT PN/N SW CVT Shift selector In any position other than P (Park) OFF
      P (Park) ON

    Is the inspection result normal?

    YES 

    Refer to INTERMITTENT INCIDENT .

    NO-1 

    If DETE/CANCEL SW is incorrect. GO TO 6.

    NO-2 

    If SFT PN/N SW is incorrect. GO TO 2.

  2. CHECK BCM INPUT SIGNAL

    1. Turn ignition switch ON.
    2. Check voltage between BCM harness connector and ground.
      (+) (-) Condition Voltage (V)
      (Approx.)
      BCM
      Connector Terminal
      M18 39 Ground Selector lever P or N position 12
      Other than above 0

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 3  .

  3. CHECK BCM INPUT SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect BCM connector.
    3. Disconnect transmission range switch connector.
    4. Check continuity between transmission range switch harness connector and BCM harness connector.
      Transmission range switch BCM Continuity
      Connector Terminal Connector Terminal
      F29 10 M18 39 Yes
    5. Check continuity between transmission range switch harness connector and ground.
      Transmission range switch Ground Continuity
      Connector Terminal
      F29 10 No

    Is the inspection result normal?

    YES 

    Refer to INTERMITTENT INCIDENT .

    NO 

    GO TO 5.

  4. REPLACE BCM

    1. Replace BCM. Refer to REMOVAL AND INSTALLATION .
    2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

    Inspection End.

  5. CHECK DTC OF TCM

    Check DTC in "Self Diagnostic Result" mode of "TCM" using CONSULT.

    Is DTC detected?

    YES 

    Perform the trouble diagnosis related to the detected DTC. Refer to DTC LOGIC (RE0F10E) or DTC LOGIC (RE0F10J).

    NO 

    Perform the trouble diagnosis related to the TCM power and ground circuits  . Refer to DIAGNOSIS PROCEDURE (RE0F10E) or DIAGNOSIS PROCEDURE (RE0F10J).

  6. CHECK CVT SHIFT SELECTOR POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Disconnect CVT shift selector (park position switch) connector.
    3. Check voltage between CVT shift selector (park position switch) harness connector and ground.
      (+) (-) Voltage (V)
      (Approx.)
      CVT shift selector (park position switch)
      Connector Terminal
      M78 5 Ground 12

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair or replace harness  .

  7. CHECK CVT SHIFT SELECTOR POWER SUPPLY CIRCUIT

    1. Disconnect BCM connector.
    2. Check continuity between CVT shift selector (park position switch) harness connector and BCM harness connector.
      CVT shift selector (park position switch) BCM Continuity
      Connector Terminal Connector Terminal
      M78 5 M19 69 Yes
    3. Check continuity between CVT shift selector (park position switch) harness connector and ground.
      CVT shift selector (park position switch) Ground Continuity
      Connector Terminal
      M78 5 No

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Repair or replace harness.

  8. CHECK CVT SHIFT SELECTOR CIRCUIT

    1. Disconnect BCM connector and IPDM E/R connector.
    2. Check continuity between CVT shift selector (park position switch) harness connector and BCM harness connector.
      CVT shift selector (park position switch) BCM Continuity
      Connector Terminal Connector Terminal
      M78 6 M18 20 Yes
    3. Check continuity between CVT shift selector (park position switch) harness connector and ground.
      CVT shift selector (park position switch) Ground Continuity
      Connector Terminal
      M78 6 No

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    Repair or replace harness.

  9. CHECK CVT SHIFT SELECTOR (PARK POSITION SWITCH)

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Replace CVT shift selector. Refer to REMOVAL AND INSTALLATION (RE0F10E) or REMOVAL AND INSTALLATION (RE0F10J).

  10. REPLACE BCM

    1. Replace BCM. Refer to REMOVAL AND INSTALLATION .
    2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

    Inspection End.

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