CAN COMMUNICATION SYSTEM Open in Bus 5 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines 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 the central gateway ECU (network gateway ECU) is 70 Ω or higher.

  • CAN main bus lines or connector

  • Central gateway ECU (network gateway ECU)

  • Combination meter assembly

  • No. 3 CAN junction connector

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 5 junction connector

    (for RHD)

  • No. 6 junction connector

    (for LHD)

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

WIRING DIAGRAM

B0070VFE04

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 ignition 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 ignition 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

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

    DTC check procedure: Turn the ignition switch to ON 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 MAIN BUS LINES (NO. 2 JUNCTION CONNECTOR)


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

    2. Disconnect the R97 No. 2 junction connector.

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

      B006ZE9C44
      *a

      Front view of wire harness connector

      (to No. 2 Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c

      to No. 5 Junction Connector

      (for RHD)

      		 *d

      to No. 6 Junction Connector

      (for LHD)
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R97-1 (CANH) - R97-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      R97-2 (CANH) - R97-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 junction connector*1
      R97-2 (CANH) - R97-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 junction connector*2

      • *1: for RHD

      • *2: for LHD

      Result
      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 5 junction connector (for RHD)) C
      NG (Line to No. 6 junction connector (for LHD)) D

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

    C

    CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 5 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 6 JUNCTION CONNECTOR) Click here

    B

  2. CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 2 JUNCTION CONNECTOR)


    1. Reconnect the R97 No. 2 junction connector.

    2. Disconnect the K76 central gateway ECU (network gateway ECU) connector.

    3. B006YY1C18
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K76-15 (CA5H) - K76-16 (CA5L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 2 JUNCTION CONNECTOR)

  3. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 5 JUNCTION CONNECTOR)


    1. Reconnect the R97 No. 2 junction connector.

    2. Disconnect the R100 No. 5 junction connector.

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

      B006ZE9C46
      *a

      Front view of wire harness connector

      (to No. 5 Junction Connector)

      		 *b to No. 2 Junction Connector
      *c to No. 1 Junction Connector - -
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R100-5 (CANH) - R100-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 junction connector
      R100-6 (CANH) - R100-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 junction connector
      Result
      Result Proceed to
      OK A
      NG (Line to No. 2 junction connector) B
      NG (Line to No. 1 junction connector) C

    A

    REPLACE NO. 5 JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

    GO TO STEP 5 Click here

  4. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 6 JUNCTION CONNECTOR)


    1. Reconnect the R97 No. 2 junction connector.

    2. Disconnect the R101 No. 6 junction connector.

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

      B007124C34
      *a

      Front view of wire harness connector

      (to No. 6 Junction Connector)

      		 *b to No. 2 Junction Connector
      *c to No. 1 Junction Connector - -
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R101-1 (CANH) - R101-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 junction connector
      R101-2 (CANH) - R101-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 junction connector
      Result
      Result Proceed to
      OK A
      NG (Line to No. 2 junction connector) B
      NG (Line to No. 1 junction connector) C

    A

    REPLACE NO. 6 JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

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


    1. Reconnect the R100 No. 5 junction connector or R101 No. 6 junction connector.

    2. Disconnect the R94 No. 1 junction connector.

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

      B006ZE9C59
      *a

      Front view of wire harness connector

      (to No. 1 Junction Connector)

      		 *b to No. 3 CAN Junction Connector
      *c

      to No. 5 Junction Connector

      (for RHD)

      		 *d

      to No. 6 Junction Connector

      (for LHD)
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R94-3 (CANH) - R94-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 3 CAN junction connector
      R94-4 (CANH) - R94-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 junction connector*1
      R94-4 (CANH) - R94-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 junction connector*2

      • *1: for RHD

      • *2: for LHD

      Result
      Result Proceed to
      OK A
      NG (Line to No. 5 junction connector (for RHD)) B
      NG (Line to No. 6 junction connector (for LHD)) C
      NG (Line to No. 3 CAN junction connector) D

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 6 JUNCTION CONNECTOR)

    D

  6. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR)


    1. Reconnect the R94 No. 1 junction connector.

    2. Disconnect the K126 No. 3 CAN junction connector.

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

      B007124C23
      *a

      Front view of wire harness connector

      (to No. 3 CAN Junction Connector)

      		 *b to No. 1 Junction Connector
      *c to Combination Meter Assembly - -
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      K126-3 (CANH) - K126-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 junction connector
      K126-5 (CANH) - K126-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      Result
      Result Proceed to
      OK A
      NG (Line to No. 1 junction connector) B
      NG (Line to combination meter assembly) C

    A

    REPLACE NO. 3 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

  7. CHECK FOR OPEN IN CAN MAIN BUS LINES (COMBINATION METER ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)


    1. Reconnect the K126 No. 3 CAN junction connector.

    2. Disconnect the K21 combination meter assembly connector.

    3. B00716QC25
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-32 (CANH) - K21-31 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)