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CAN COMMUNICATION SYSTEM Check Bus 3 Line for Short to +B

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DTC Code DTC Name
  Check Bus 3 Line for Short to +B
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DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

Symptom Trouble Area
There is no resistance between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

  • Short to +B in CAN main bus line

  • Short to +B in CAN branch line

  • Central gateway ECU (network gateway ECU)

  • Telematics transceiver (w/ Telematics Transceiver)

  • Radio receiver assembly

  • Option connector (bus buffer ECU) (w/ CAN Compatible Optional Devices)

  • No. 3 CAN junction connector (for LHD)

  • No. 4 CAN junction connector (for RHD)
Figure 2. for RHD: B0067KFE01
Figure 1. for LHD:
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WIRING DIAGRAM

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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.

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  • 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.

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  • 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.

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Tip:

  • 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.

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PROCEDURE


  1. Click here

    CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

  2. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 3 CAN JUNCTION CONNECTOR)


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

    2. B0066X0C13
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 3 CAN Junction Connector)

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

      to Telematics Transceiver

      (w/ Telematics Transceiver)

      		 *d to Radio Receiver Assembly
      *e to Option Connector (Bus Buffer ECU) - -

      Disconnect the O106 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 Connected to
      O106-7 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      O106-18 (CANL) - O8-16 (BAT)
      O106-8 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Telematics transceiver*
      O106-19 (CANL) - O8-16 (BAT)
      O106-9 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Radio receiver assembly
      O106-20 (CANL) - O8-16 (BAT)
      O106-10 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Option connector (bus buffer ECU)
      O106-21 (CANL) - O8-16 (BAT)
      O106-11 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      O106-22 (CANL) - O8-16 (BAT)

      • *: w/ Telematics Transceiver

      Result
      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to ECU or sensor) C

  3. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR)


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

    2. B0066X0C19
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 4 CAN Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c to Radio Receiver Assembly - -

      Disconnect the O107 No. 4 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
      O107-7 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      O107-18 (CANL) - O8-16 (BAT)
      O107-9 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Radio receiver assembly
      O107-20 (CANL) - O8-16 (BAT)
      O107-11 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      O107-22 (CANL) - O8-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to ECU or sensor) C

  4. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. B0065JAC33
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

      		 - -

      Disconnect the O145 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
      O145-6 (CA3H) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      O145-21 (CA3L) - O8-16 (BAT)
      O145-19 (CAYH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      O145-20 (CAYL) - O8-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    • A

      REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)Click here

    • B

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

    • C

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

  5. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected.

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    3. B00680BC43
      *1 DLC3 - -
      *a

      Component with harness connected

      (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
      O145-6 (CA3H) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      O145-21 (CA3L) - O8-16 (BAT)
      Tip:

      If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      Result
      Result
      OK
      NG

    • OK

      REPLACE ECU OR SENSOR

    • NG

      REPAIR OR REPLACE ECU OR SENSOR BRANCH LINES OR CONNECTOR