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Home >> Infiniti >> 2017 >> Q50 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 428 (Security Control System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC B2604: Shift Position >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 

    If DTC B2604 is displayed with DTC U1000 or U1010, first perform the trouble diagnosis for DTC U1000 or U1010.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. U1000: Refer to DTC Description . U1010: Refer to DTC Description .

    NO

    GO TO 2.

  2. 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 Index .

    NO

    GO TO 3.

  3. CHECK P/N POSITION SIGNAL 
    1. Turn ignition switch ON.
    2. Check voltage between BCM harness connector and ground.

      (+)

      (-)

      Condition

      Voltage

      BCM

      Connector

      Terminal

      M13

      39

      Ground

      Selector lever

      P or N position
      GNSJSMIA1472GB-472Courtesy of NISSAN NORTH AMERICA, INC.

      Other than above

      0 V

    Is the inspection result normal?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    GO TO 4.

  4. CHECK P/N POSITION SIGNAL CIRCUIT 1 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector, BCM connector and A/T assembly connector.
    3. Check continuity between A/T assembly harness connector and BCM harness connector.

      A/T assembly

      BCM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F2

      9

      M13

      39

      Existed
    4. Check continuity between A/T assembly harness connector and ground.

      A/T assembly

      Ground

      Continuity

      Connector

      Terminal

      F2

      9

      Not existed

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace harness.

  5. CHECK P/N POSITION SIGNAL CIRCUIT 2 
    1. Check continuity between A/T assembly harness connector and IPDM E/R harness connector.

      A/T assembly

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F2

      9

      E121

      37

      Existed
    2. Check continuity between A/T assembly harness connector and ground.

      A/T assembly

      Ground

      Continuity

      Connector

      Terminal

      F2

      9

      Not existed

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace harness.

  6. CHECK JOINT CONNECTOR 
    1. Remove joint connector.
    2. Check continuity between joint connector terminals.

      A/T assembly harness connector side

      TCM harness connector side

      Continuity

      Terminal

      Terminal

      9

      9

      Existed

    Is the inspection result normal?

    YES

    Replace TCM. Refer to Removal and Installation .

    NO

    Replace joint connector. Refer to Removal and Installation .

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