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Inspection Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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.

    OK or NG 

    OK: GO TO 2.

    NG: Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) 

    Check the continuity between the data link connector terminals.

    TERMINALS CONTINUITY REFERENCE

    Data link connector Continuity
    Connector No. Terminal No.
    M22 6 14 No

    OK or NG 

    OK: GO TO 3.

    NG: 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.

    TERMINALS CONTINUITY REFERENCE

    Data link connector Ground Continuity
    Connector No. Terminal No.
    M22 6 No
    14 No

    OK or NG 

    OK: GO TO 4.

    NG: 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.
      TERMINALS RESISTANCE SPECIFICATION

      ECM Resistance (Ω)
      Terminal No.
      94 86 Approx. 108 - 132
    3. Check the resistance between the IPDM E/R terminals.
      TERMINALS RESISTANCE SPECIFICATION

      IPDM E/R Resistance (Ω)
      Terminal No.
      39 40 Approx. 108 - 132
      Fig 1: Checking Resistance Between ECM Terminals
      G04879096Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 5.

    NG: 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.

    Non-reproduced: 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 all the unit connectors on 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.

    Non-reproduced: Replace the unit whose connector was disconnected.

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