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DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONNECTOR INSPECTION 
    1. Turn the ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Disconnect all the unit connectors on CAN communication system.
    4. Check terminals and connectors for damage, bend and loose connection.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) 

    Check the continuity between the data link connector terminals.

    Data link connector

    Continuity

    Connector No.

    Terminal No.

    M22

    6

    14

    Not existed

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Check the harness and repair the root cause.

  3. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) 

    Check the continuity between the data link connector and the ground.

    Data link connector

    Ground

    Continuity

    Connector No.

    Terminal No.

    M22

    6

    Not existed

    14

    Not existed

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Check the harness and repair the root cause.

  4. CHECK ECM AND IPDM E/R TERMINATION CIRCUIT 
    1. Remove the ECM and the IPDM E/R.
    2. Check the resistance between the ECM terminals.

      ECM

      Resistance (Ohm)

      Terminal No.

      124

      123

      Approx. 108 - 132
    3. Check the resistance between the IPDM E/R terminals.

      IPDM E/R

      Resistance (Ohm)

      Terminal No.

      39

      40

      Approx. 108 - 132

    Is the measurement value within the specification?

    YES

    GO TO 5.

    NO

    Replace the ECM and/or the IPDM E/R.

  5. CHECK SYMPTOM 

    Connect all the connectors. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced.

    Inspection result

    Reproduced

    GO TO 6.

    NO

    Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.

  6. CHECK UNIT REPRODUCTION 

    Perform the reproduction test as per the following procedure for each unit.

    1. Turn the ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Disconnect one of the unit connectors of CAN communication system.
      NOTE: ECM and IPDM E/R have a termination circuit. Check other units first.
    4. Connect the battery cable to the negative terminal. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced.
      NOTE: Although unit-related error symptoms occur, do not confuse them with other symptoms.

    Inspection result

    Reproduced

    Connect the connector. Check other units as per the above procedure.

    NO

    Replace the unit whose connector was disconnected.

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