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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 460 (Can System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> It Can Communication Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti QX60. 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. Check the terminals and connectors of the 3CH CAN gateway for damage, bend and loose connection (unit side and connector side).

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 
    1. Disconnect the connector of 3CH CAN gateway.
    2. Check the continuity between the 3CH CAN gateway harness connector terminals.

      3CH CAN gateway harness connector

      Continuity

      Connector No.

      Terminal No.

      M6

      9

      13

      Existed

      10

      14

      Existed

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Check the harness and repair or replace the root cause.

  3. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) 
    1. Disconnect all the unit connectors on IT CAN communication circuit.
    2. Check the continuity between the 3CH CAN gateway harness connector terminals.

      3CH CAN gateway harness connector

      Continuity

      Connector No.

      Terminal No.

      M6

      9

      10

      Not existed

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Check the harness and repair or replace the root cause.

  4. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) 

    Check the continuity between the 3CH CAN gateway harness connector and the ground.

    3CH CAN gateway harness connector

    Ground

    Continuity

    Connector No.

    Terminal No.

    M6

    9

    Not existed

    10

    Not existed

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Check the harness and repair or replace the root cause.

  5. CHECK 3CH CAN GATEWAY TERMINATION CIRCUIT 
    1. Remove the 3CH CAN gateway.
    2. Check the resistance between the 3CH CAN gateway terminals.

      3CH CAN gateway

      Resistance (Ohm)

      Terminal No.

      9

      10

      Approx. 108 - 132

      13

      14

      Approx. 108 - 132

    Is the measurement value within the specification?

    YES

    GO TO 6.

    NO

    Replace the 3CH CAN gateway.

  6. 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 7.

    NO

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

  7. 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 IT CAN communication circuit.
      NOTE: 3CH CAN gateway have two termination circuits. 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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