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CAN Communication Circuit Inspection

WARNING: This page is about a different car, the 2006 Nissan Titan. 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.

    Fig 1: Checking Continuity Between Data Link Connector Terminals
    G04189575Courtesy of NISSAN MOTOR CO., U.S.A.
    DATA LINK CONNECTOR CONTINUITY

    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.
  3. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between data link connector terminals and ground.

    Fig 2: Checking Continuity Between Data Link Connector Terminals And Ground
    G04189576Courtesy of NISSAN MOTOR CO., U.S.A.
    DATA LINK CONNECTOR TERMINALS AND GROUND CONTINUITY

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

    OK or NG 

    OK: GO TO 4.

    NG:

    • Repair harness.
    • Change 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.
      Fig 3: Checking Resistance Between ECM And IPDM E/R Terminals
      G04189577Courtesy of NISSAN MOTOR CO., U.S.A.
      ECM TERMINALS RESISTANCE

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

      Terminal Resistance (Approx.)
      39 40 108 - 132 Ω

    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. 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. (Do not confuse it with the symptom related to removed unit.)
    6. Make sure that the same symptom is reproduced.

    Inspection results 

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

    Not reproduced: Replace removed unit.

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