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CAN COMMUNICATION SYSTEM(for LHD with Central Gateway ECU) Open in Bus 5 Main Bus Line

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DTC Code DTC Name
  Open in Bus 5 Main Bus Line
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DESCRIPTION

There may be an open circuit in one of the bus 5 CAN main wires when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Symptom Trouble Area
Resistance between terminals 15 (CA5H) and 16 (CA5L) of central gateway ECU (network gateway ECU) is 70 Ω or higher.

  • CAN main wire or connector

  • Central gateway ECU (network gateway ECU)

  • No. 3 CAN junction connector

This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.

Table 1. *1 CAXH *2 CAXL *3 No. 3 CAN Junction Connector *4 Central Gateway ECU (Network Gateway ECU)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

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  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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Tip:

  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

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PROCEDURE


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    CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU)


    1. B0024YDC06
      *a

      Front view of wire harness connector

      (to No. 3 CAN Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the No. 3 CAN junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G131-6 (CANH) - G131-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      G131-7 (CANH) - G131-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE NO. 3 CAN JUNCTION CONNECTOR

    • NGClick here
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    CONNECT CONNECTOR


    1. Reconnect the G131 No. 3 CAN junction connector.

      Result
      Proceed to
      NEXT

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    CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU)


    1. B002547C70
      *a

      Front view of wire harness connector

      (to Central Gateway ECU [Network Gateway ECU])

      Disconnect the central gateway ECU (network gateway ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G128-15 (CA5H) - G128-16 (CA5L) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      G128-9 (CAXH) - G128-24 (CAXL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)Click here

    • NG

      REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 3 CAN JUNCTION CONNECTOR)