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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> DLC Branch Line Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CONNECTOR 
    1. Turn the ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
      • Data link connector
      • 6CH CAN gateway

    Is the inspection result normal?

    >>

    GO TO 2.

    >>

    Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 
    1. Disconnect the connector of 6CH CAN gateway.
    2. Check the continuity between the 6CH CAN gateway harness connector terminals.
      6CH CAN gateway harness connector Continuity
      Connector No. Terminal No.
      M462 8 11 Existed
      20 23 Existed

    Is the inspection result normal?

    >>

    GO TO 3.

    >>

    Check the harness and repair the root cause (Diagnostic CAN communication circuit side).

  3. CHECK HARNESS FOR OPEN CIRCUIT 
    1. Connect the connector of 6CH CAN gateway.
    2. Check the resistance between the data link connector terminals.
      Data link connector Resistance (Ω)
      Connector No. Terminal No.
      M22 6 14 Approx. 54 - 66

    Is the measurement value within the specification?

    >>

    Check CAN system type decision again.

    >>

    Error was detected in the data link connector branch line circuit.

    >>

    Repair the data link connector branch line.