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CAN Communication Circuit Inspection

WARNING: This page is about a different car, the 2006 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTOR 
    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 as necessary.

  2. CHECK HARNESS FOR SHORT CIRCUIT 

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

    TERMINAL CONNECTOR CONTINUITY CHART

    Data link connector Terminal Continuity
    M22 6 14 No
    Fig 1: Disconnecting Battery Cable From Negative Terminal
    G04177592Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO 3.

    NG :

    • Repair harness.
    • Replace harness if shielded lines are used for the harness.
  3. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between data link connector terminals and ground.

    TERMINAL CONNECTOR CONTINUITY CHART

    Data link connector Terminal Ground Continuity
    M22 6 No
    14 No
    Fig 2: Checking Continuity Between Data Link Connector Terminals And Ground
    G04177593Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO 4.

    NG :

    • Repair harness.
    • Replace harness if shielded lines are used for the harness.
  4. ECM AND IPDM E/R INTERNAL CIRCUIT INSPECTION 
    1. Remove ECM and IPDM E/R from vehicle.
    2. Check resistance between ECM terminals.
      TERMINAL CONNECTOR CONTINUITY CHART

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

    Terminal Resistance (Approx.)
    39 40 108 - 132 ohm
    Fig 3: Checking Resistance Between Ipdm E/R Terminals
    G04177594Courtesy 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.

    Check results 

    Reproduced>>GO TO 6.

    Not reproduced>>Refer to , "EXAMPLE OF FILLING IN CHECK SHEET WHEN INITIAL CONDITIONS ARE NOT REPRODUCED "

  6. UNIT REPRODUCIBILITY INSPECTION 

    Perform the following procedure for each unit on the CAN network, 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.
    NOTE: Malfunction (related to a unit that the connector is disconnected) is reproduced. Do not confuse the malfunction with the symptom filled in the column of "Symptom" on the check sheet.

    Inspection results 

    Reproduced>>Connect the disconnected connector. Check other units applying the above procedure.

    Not reproduced>>Replace the unit that the connector is disconnected.

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