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Home >> Nissan-Datsun >> 2005 >> Altima SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 450 (LAN System) >> Can >> Trouble Diagnosis >> CAN Communication Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Nissan Quest. 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.

    CONTINUITY CHART

    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.

    CONTINUITY CHART

    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.
      RESISTANCE CHART

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

      IPDM E/R Resistance (Ω)
      Terminal No.
      48 49 Approx. 108-132

    OK or NG 

    OK: GO TO 5.

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

    Fig 1: Checking ECM And IPDM E/R Resistance
    G04879096Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK SYMPTOM 

    Connect all the connectors. Check if the symptoms described in the "Symptom (Results of 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 unit whose connector was disconnected.

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