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CAN COMMUNICATION SYSTEM Check Bus 2 Lines for Short Circuit

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DTC Code DTC Name
  Check Bus 2 Lines for Short Circuit
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DESCRIPTION

There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 18 (CA4H) and 17 (CA4L) of central gateway ECU (network gateway ECU) is below 54 Ω.

  • Short in CAN main bus lines

  • Short in CAN branch lines

  • Central gateway ECU (network gateway ECU)

  • ECM

  • Combination meter assembly

  • Air conditioning amplifier assembly

  • Power steering ECU assembly

  • Certification ECU (smart key ECU assembly)

  • Airbag ECU assembly

  • Yaw rate sensor

  • Main body ECU (multiplex network body ECU)

  • Skid control ECU (brake actuator assembly)

  • Steering sensor

  • Stereo component equalizer assembly

  • Torque vectoring differential ECU assembly (w/ Torque Vectoring Differential System)

  • Spoiler control ECU assembly

  • No. 1 CAN junction connector

  • No. 2 CAN junction connector
B0067HVE02
Figure 2. for RHD: B0065B5E02
B0067P4E01
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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  • Before replacing the ECM, main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.

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 FOR SHORT IN CAN BUS LINES (ECM)


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

    2. B0066J2C64
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A78 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A78-13 (CANH) - A78-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

  2. Click here

    CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY)


    1. Reconnect the A78 ECM connector.

    2. B0067KNC02
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the O3 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O3-29 (CANH) - O3-30 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

  3. Click here

    CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR)


    1. Reconnect the O3 combination meter assembly connector.

    2. B0066MIC28
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Connector
      *c to Combination Meter Assembly *d to Central Gateway ECU (Network Gateway ECU)
      *e to Air Conditioning Amplifier Assembly *f

      to Torque Vectoring Differential ECU Assembly

      (w/ Torque Vectoring Differential System)
      *g to Certification ECU (Smart Key ECU Assembly) *h to Stereo Component Equalizer Assembly
      *i to Power Steering ECU Assembly - -

      Disconnect the O104 No. 1 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
      O104-1 (CANH) - O104-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      O104-2 (CANH) - O104-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      O104-4 (CANH) - O104-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Central gateway ECU (network gateway ECU)
      O104-5 (CANH) - O104-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
      O104-6 (CANH) - O104-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Torque vectoring differential ECU assembly*
      O104-7 (CANH) - O104-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)
      O104-8 (CANH) - O104-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Stereo component equalizer assembly
      O104-9 (CANH) - O104-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Power steering ECU assembly

      • *: w/ Torque Vectoring Differential System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 2 CAN junction connector) B
      NG (Line to combination meter assembly) C
      NG (Line to central gateway ECU (network gateway ECU)) D
      NG (Line to ECU or sensor) E

    • A

      REPLACE NO. 1 CAN JUNCTION CONNECTOR

    • BClick here
    • C

      REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)

    • DClick here
    • EClick here

      GO TO STEP 9

  4. Click here

    CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the O104 No. 1 CAN junction connector.

    2. B0066MIC36
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 1 CAN Junction Connector
      *c to Main Body ECU (Multiplex Network Body ECU) *d to ECM
      *e to Airbag ECU Assembly *f to Yaw Rate Sensor
      *g to Spoiler Control ECU Assembly *h to Steering Sensor
      *i to Skid Control ECU (Brake Actuator Assembly) - -

      Disconnect the O105 No. 2 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
      O105-1 (CANH) - O105-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      O105-2 (CANH) - O105-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      O105-3 (CANH) - O105-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      O105-5 (CANH) - O105-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Airbag ECU assembly
      O105-6 (CANH) - O105-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Yaw rate sensor
      O105-7 (CANH) - O105-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Spoiler control ECU assembly
      O105-9 (CANH) - O105-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Steering sensor
      O105-10 (CANH) - O105-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Skid control ECU (brake actuator assembly)
      Result
      Result Proceed to
      OK A
      NG (Line to No. 1 CAN junction connector) B
      NG (Line to ECM) C
      NG (Line to ECU or sensor) D

    • A

      REPLACE NO. 2 CAN JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

    • C

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

    • DClick here

      GO TO STEP 9

  5. Click here

    CHECK FOR SHORT IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Reconnect the O104 No. 1 CAN junction connector.

    2. B0065T7C73
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

      Disconnect the O145 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O145-18 (CA4H) - O145-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    • OK

      REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)Click here

    • NG

      REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

  6. Click here

    CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR)


    1. Reconnect the O3 combination meter assembly connector.

    2. B0066MIC37
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Connector
      *c to Combination Meter Assembly *d to Airbag ECU Assembly
      *e

      to Torque Vectoring Differential ECU Assembly

      (w/ Torque Vectoring Differential System)

      		 *f to Steering Sensor
      *g to Stereo Component Equalizer Assembly *h to Skid Control ECU (Brake Actuator Assembly)

      Disconnect the O104 No. 1 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
      O104-1 (CANH) - O104-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      O104-2 (CANH) - O104-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      O104-4 (CANH) - O104-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Airbag ECU assembly
      O104-6 (CANH) - O104-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Torque vectoring differential ECU assembly*
      O104-7 (CANH) - O104-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Steering sensor
      O104-8 (CANH) - O104-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Stereo component equalizer assembly
      O104-9 (CANH) - O104-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Skid control ECU (brake actuator assembly)

      • *: w/ Torque Vectoring Differential System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 2 CAN junction connector) B
      NG (Line to combination meter assembly) C
      NG (Line to ECU or sensor) D

    • A

      REPLACE NO. 1 CAN JUNCTION CONNECTOR

    • BClick here
    • C

      REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)

    • DClick here

      GO TO STEP 9

  7. Click here

    CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the O104 No. 1 CAN junction connector.

    2. B0066MIC39
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 1 CAN Junction Connector
      *c to Main Body ECU (Multiplex Network Body ECU) *d to ECM
      *e to Central Gateway ECU (Network Gateway ECU) *f to Air Conditioning Amplifier Assembly
      *g to Yaw Rate Sensor *h to Certification ECU (Smart Key ECU Assembly)
      *i to Spoiler Control ECU Assembly *j to Power Steering ECU Assembly

      Disconnect the O105 No. 2 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
      O105-1 (CANH) - O105-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      O105-2 (CANH) - O105-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      O105-3 (CANH) - O105-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      O105-5 (CANH) - O105-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Central gateway ECU (network gateway ECU)
      O105-6 (CANH) - O105-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
      O105-7 (CANH) - O105-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Yaw rate sensor
      O105-8 (CANH) - O105-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)
      O105-9 (CANH) - O105-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Spoiler control ECU assembly
      O105-10 (CANH) - O105-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Power steering ECU assembly
      Result
      Result Proceed to
      OK A
      NG (Line to No. 1 CAN junction connector) B
      NG (Line to ECM) C
      NG (Line to central gateway ECU (network gateway ECU)) D
      NG (Line to ECU or sensor) E

    • A

      REPLACE NO. 2 CAN JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

    • C

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

    • DClick here
    • EClick here
  8. Click here

    CHECK FOR SHORT IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Reconnect the O105 No. 2 CAN junction connector.

    2. B0065T7C73
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

      Disconnect the O145 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O145-18 (CA4H) - O145-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    • OK

      REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)Click here

    • NG

      REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

  9. Click here

    CHECK FOR SHORT IN CAN BUS LINES (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 short circuited branch line is connected.

      Click here

    3. B0066SDC59
      *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
      O145-18 (CA4H) - O145-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Tip:

      If the resistance becomes normal (between 54 and 69 Ω) 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