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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Security Control System (DTC/Circuit Diagnosis)) >> DTC / Circuit Diagnosis >> DTC B2603: Shift Position >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CVT SHIFT SELECTOR SWITCH FUNCTION 
    1. Turn ignition switch ON.
    2. Select "DETE/CANCL SW" and "SFT PN/N SW" in "Data Monitor" mode.
    3. Check "DETE/CANCL SW" and "SFT PN/N SW" indication under the following conditions:

      Monitor item

      Condition

      Indication

      DETE/CANCL SW

      CVT Shift selector

      In any position other than P (Park)

      ON

      P (Park)

      OFF

      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

    If "DETE/CANCL SW" is incorrect. GO TO 6.

    NO

    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

      (Approx.)

      BCM

      Connector

      Terminal

      M21

      39

      Ground

      Selector lever

      P or N position

      Battery voltage

      Other than above

      0

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 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

      F86

      10

      M21

      39

      Yes

    5. Check continuity between transmission range switch harness connector and ground.

      Transmission range switch

      Ground

      Continuity

      Connector

      Terminal

      F86

      10

      No

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace harness.

  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 

    SYMBOL CONSULT

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

    Is DTC detected?

    YES

    Perform the trouble diagnosis related to the detected DTC. Refer to DTC Index .

    NO

    Perform the trouble diagnosis related to the TCM power and ground circuits. Refer to Diagnosis Procedure .

  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

      (Approx.)

      CVT shift selector (park position switch)

      Connector

      Terminal

      M78

      5

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 7.

  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

      M20

      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

    Replace BCM. Refer to Removal and Installation .

    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

      M21

      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 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 10.

    NO

    Replace CVT shift selector. Refer to Removal and Installation .

  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.