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CAN Communication Circuit Inspection

WARNING: This page is about a different car, the 2006 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONNECTOR INSPECTION 
    1. Turn ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Disconnect the harness connector for each unit on the CAN network and check terminals for deformation, disconnection, looseness or damage.

    OK or NG 

    OK: GO TO 2.

    NG: Repair terminal or connector.

  2. CHECK HARNESS FOR SHORT CIRCUIT 

    With all module and control unit connectors disconnected, check continuity between data link connector terminals.

    CONTINUITY REFERENCE CHART

    Data link connector Terminal Continuity
    M22 6 14 No

    OK or NG 

    OK: GO TO 3.

    NG :

    • Repair harness.
    • Change harness if shielded lines are used for the harness.
      Fig 1: Identifying Continuity Between Data Link Connector Terminals
      G04201421Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between data link connector terminals and ground.

    CONTINUITY REFERENCE CHART

    Data link connector Terminal Ground Continuity
    M22 6 No
    14 No
    Fig 2: Identifying Continuity Between Data Link Connector Terminals And Ground
    G04201422Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG :

    • Repair harness.
    • Change harness if shielded lines are used for the harness.
  4. CHECK ECM AND IPDM E/R INTERNAL CIRCUIT 
    1. Remove ECM and IPDM E/R from vehicle.
    2. Check resistance between ECM terminals.
      RESISTANCE REFERENCE CHART

      Terminal Resistance (Approx.)
      94 86 108 - 132 ohm
    3. Check resistance between IPDM E/R terminals.
      RESISTANCE REFERENCE CHART

      Terminal Resistance (Approx.)
      48 49 108 - 132 ohm
      Fig 3: Identifying Resistance Between IPDM E/R Terminals
      G04201423Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 5.

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

  5. CHECK SYMPTOM 
    1. Fill in described symptoms on the column "Symptom" in the check sheet.
    2. Connect all connectors, and then make sure that the symptom is reproduced.

    OK or NG 

    OK: GO TO 6.

    NG: Refer to "EXAMPLE OF FILLING IN CHECK SHEET WHEN INITIAL CONDITIONS ARE NOT REPRODUCED ".

  6. CHECK UNIT REPRODUCIBILITY 

    Performs the following procedure for each unit, and then perform reproducibility test.

    1. Turn ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Disconnect the unit connector.
    4. Connect the battery cable to the negative terminal.
    5. Make sure that the symptom filled in the "Symptom" of the check sheet is reproduced. (Do not confuse it with the symptom related to removed unit.)
    6. Make sure that the same symptom is reproduced.

    Check results 

    Reproduce: Install removed unit, and then check the other unit.

    Not reproduced: Replace removed unit.

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