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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (4 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0850: PNP Switch >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC WITH TCM 

    Refer to CONSULT Function .

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace malfunctioning part.

  2. CHECK STARTING SYSTEM 

    Turn ignition switch OFF, then turn it to START.

    Does starter motor operate?

    YES

    GO TO 3.

    NO

    Check DTC with BCM. Refer to DTC Index .

  3. CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect A/T assembly harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between A/T assembly harness connector and ECM harness connector.

      A/T assembly

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F55

      9

      F79

      62

      Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    GO TO 4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between A/T assembly and ECM
    • Loose or poor connection for each connector and harness

    Repair open circuit, short to ground or short to power in harness or connectors.

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