CAN COMMUNICATION SYSTEM Open in Bus Chassis Local Bus Line

DESCRIPTION

There may be an open circuit in the CAN main line and/or CAN branch line when the resistance between terminals 3 (CANP) and 2 (CANN) of the No. 8 CAN junction terminal is 70 Ω or higher.

Symptom Trouble Area
The resistance between terminals 3 (CANP) and 2 (CANN) of the No. 8 CAN junction terminal is 70 Ω or higher.

  • Open in CAN main bus wire

  • No. 10 CAN junction connector

  • No. 8 CAN junction connector

  • No. 5 CAN junction connector

  • No. 15 CAN junction connector

WIRING DIAGRAM

B006G41E01

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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.

    Click here

  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any 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 engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

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

    Click here

Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR)


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

    2. Disconnect the G123 No. 5 CAN junction connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition Specified Condition
      G123-18 (CANH) - G123-8 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 15 CAN junction connector
      G123-11 (CANH) - G123-1 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction terminal
      for RHD
      Tester Connection Condition Specified Condition Specified Condition
      G123-11 (CANH) - G123-1 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 15 CAN junction connector
      G123-17 (CANH) - G123-7 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (No. 10 CAN junction terminal CAN main wire) B
      NG (No. 15 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    C

    CHECK FOR OPEN IN CAN BUS WIRE (NO. 15 CAN JUNCTION CONNECTOR) Click here

    B

  2. CHECK FOR OPEN IN CAN BUS WIRE (NO. 10 CAN JUNCTION TERMINAL - NO. 5 CAN JUNCTION CONNECTOR)


    1. Reconnect the G123 No. 5 CAN junction connector.

    2. Disconnect the G124 No. 10 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G124-3 (CANH) - G124-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 10 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION TERMINAL - NO. 5 CAN JUNCTION CONNECTOR)

  3. CHECK FOR OPEN IN CAN BUS WIRE (NO. 15 CAN JUNCTION CONNECTOR)


    1. Reconnect the G123 No. 5 CAN junction connector.

    2. Disconnect the L120 No. 15 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L120-3 (CANH) - L120-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 8 CAN junction terminal
      L120-4 (CANH) - L120-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (No. 8 CAN junction terminal CAN main wire) B
      NG (No. 5 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 15 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 15 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    B

  4. CHECK FOR OPEN IN CAN BUS WIRE (NO. 8 CAN JUNCTION TERMINAL - NO. 15 CAN JUNCTION CONNECTOR)


    1. Reconnect the L120 No. 15 CAN junction connector.

    2. Disconnect the L133 No. 8 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L133-3 (CANP) - L133-2 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 8 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 8 CAN JUNCTION TERMINAL - NO. 15 CAN JUNCTION CONNECTOR)