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Home >> Infiniti >> 2011 >> G25 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (LAN System) >> Can >> Service Information >> Can Communication Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2010 Nissan Sentra. 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.

    CONNECTOR TERMINAL CONTINUITY CHART

    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.

    CONNECTOR TERMINAL CONTINUITY CHART

    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.
      • MR20DE
        CONNECTOR TERMINAL RESISTANCE CHART

        ECM Resistance (Ω)
        Terminal No.
        84 83 Approx. 108 - 132
      • QR25DE
        CONNECTOR TERMINAL RESISTANCE CHART

        ECM Resistance (Ω)
        Terminal No.
        98 97 Approx. 108 - 132
        Fig 1: Checking ECM And IPDM E/R
        G04879096Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check the resistance between the IPDM E/R terminals.
      CONNECTOR TERMINAL RESISTANCE CHART

      IPDM E/R Resistance (Ω)
      Terminal No.
      41 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.

    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 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.

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

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