CAN COMMUNICATION SYSTEM Check Bus 4 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

  • Short in CAN main bus wire

  • Short in CAN branch wire

  • Central gateway ECU (network gateway ECU)

  • Skid control ECU assembly

  • Parking brake ECU assembly

  • Rear steering control ECU*1

  • Rack and pinion power steering gear assembly

  • Pedestrian detection ECU assembly

  • Front steering control ECU*2

  • Yaw rate sensor

  • Airbag ECU assembly

  • Steering sensor

  • Absorber control ECU

  • Tire pressure warning ECU and receiver

  • No. 2 CAN junction terminal

  • No. 3 CAN junction terminal

  • No. 2 CAN junction connector

  • No. 12 CAN junction connector

  • No. 13 CAN junction connector
*1: w/ Dynamic Rear Steering System
*2: w/ Variable Gear Ratio Steering System

WIRING DIAGRAM

B000WMRE06
B000VXZE03
B000X07E04

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 SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION TERMINAL - NO. 13 CAN JUNCTION CONNECTOR)


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

    2. B000V9HC09
      *a

      Front view of wire harness connector

      (to No. 3 CAN Junction Terminal)

      Disconnect the No. 3 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X108-3 (CANH) - X108-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 3 CAN JUNCTION TERMINAL

    NG

  2. CONNECT CONNECTOR


    1. Reconnect the X108 No. 3 CAN junction terminal connector.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION TERMINAL - NO. 12 CAN JUNCTION CONNECTOR)


    1. B000V9HC10
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the No. 2 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X98-3 (CANH) - X98-2 (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

    A

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    C

    CONNECT CONNECTOR Click here

    B

  4. CONNECT CONNECTOR


    1. Reconnect the X98 No. 2 CAN junction terminal connector.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 12 CAN JUNCTION CONNECTOR)


    1. B000XEZC04
      *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
      P59-22 (CA2H) - P59-7 (CA2L) 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

  6. CONNECT CONNECTOR


    1. Reconnect the P59 central gateway ECU (network gateway ECU) connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 CAN JUNCTION CONNECTOR)


    1. B000VRUC04
      *a

      Front view of wire harness connector

      (to No. 12 CAN Junction Connector)
      *b to No. 2 CAN Junction Terminal
      *c to Tire Pressure Warning ECU and Receiver
      *d to Absorber Control ECU
      *e to No. 2 CAN Junction Connector
      *f to Central Gateway ECU (Network Gateway ECU)

      Disconnect the No. 12 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X96-1 (CANH) - X96-7 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      X96-2 (CANH) - X96-8 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Tire pressure warning ECU and receiver
      X96-3 (CANH) - X96-9 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Absorber control ECU
      X96-4 (CANH) - X96-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      X96-5 (CANH) - X96-11 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Central gateway ECU (network gateway ECU)
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal CAN main wire) B
      NG (Central gateway ECU [network gateway ECU] CAN branch wire) C
      NG (No. 2 CAN junction connector CAN main wire) D
      NG (Wire to ECU or sensor) E

    A

    REPLACE NO. 12 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

    C

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU])

    E

    GO TO STEP 20 Click here

    D

  8. CONNECT CONNECTOR


    1. Reconnect the X96 No. 12 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the No. 2 CAN junction connector.

      B000ZBKC13
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to Pedestrian Detection ECU Assembly
      *c to Front Steering Control ECU (w/ Variable Gear Ratio Steering System) *d to Yaw Rate Sensor
      *e to Airbag ECU Assembly *f to Steering Sensor
      *g to No. 13 CAN Junction Connector *h to No. 12 CAN Junction Connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      P108-1 (CANH) - P108-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Pedestrian detection ECU assembly
      P108-2 (CANH) - P108-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front steering control ECU*
      P108-4 (CANH) - P108-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Yaw rate sensor
      P108-5 (CANH) - P108-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Airbag ECU assembly
      P108-6 (CANH) - P108-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Steering sensor
      P108-7 (CANH) - P108-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 13 CAN junction connector
      P108-8 (CANH) - P108-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 12 CAN junction connector
      *: w/ Variable Gear Ratio Steering System
      Result
      Result Proceed to
      OK A
      NG (No. 12 CAN junction connector CAN main wire) B
      NG (No. 13 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR)

    D

    GO TO STEP 20 Click here

    C

  10. CONNECT CONNECTOR


    1. Reconnect the P108 No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 13 CAN JUNCTION CONNECTOR)

    Tech Tips


    • Before disconnecting the connectors, make a note of where it is connected.

    • Reconnect the connector to its original position.


    1. Disconnect the No. 13 CAN junction connectors.

      B000XRKC01
      *1 No. 13 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 13 CAN Junction Connector)

      		 - -
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connect to
      X100 V P Parking brake ECU assembly
      X101 LG P Rear steering control ECU*
      X102 B P Rack and pinion power steering gear assembly
      X103 GR P No. 2 CAN junction connector
      X104 G P Skid control ECU assembly
      X107 R P No. 3 CAN junction terminal

      *: w/ Dynamic Rear Steering System

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X100-1 (CANH) - X100-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Parking brake ECU assembly
      X101-1 (CANH) - X101-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rear steering control ECU*
      X102-1 (CANH) - X102-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rack and pinion power steering gear assembly
      X103-1 (CANH) - X103-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      X104-1 (CANH) - X104-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Skid control ECU assembly
      X107-1 (CANH) - X107-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 3 CAN junction terminal
      *: w/ Dynamic Rear Steering System
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction connector CAN main wire) B
      NG (No. 3 CAN junction terminal CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 13 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 13 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 13 CAN JUNCTION CONNECTOR - NO. 3 CAN JUNCTION TERMINAL)

    D

    GO TO STEP 20 Click here

  12. CONNECT CONNECTOR


    1. Reconnect the X98 No. 2 CAN junction terminal connector.

      Result
      Proceed to
      NEXT

    NEXT

  13. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 13 CAN JUNCTION CONNECTOR)


    1. B000XEZC04
      *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
      P59-22 (CA2H) - P59-7 (CA2L) 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

  14. CONNECT CONNECTOR


    1. Reconnect the P59 central gateway ECU (network gateway ECU) connector.

      Result
      Proceed to
      NEXT

    NEXT

  15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 CAN JUNCTION CONNECTOR)


    1. B000VRUC05
      *a

      Front view of wire harness connector

      (to No. 12 CAN Junction Connector)
      *b to No. 2 CAN Junction Terminal
      *c to Tire Pressure Warning ECU and Receiver
      *d to Absorber Control ECU
      *e to No. 2 CAN Junction Connector
      *f to Skid Control ECU Assembly

      Disconnect the No. 12 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X96-1 (CANH) - X96-7 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      X96-2 (CANH) - X96-8 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Tire pressure warning ECU and receiver
      X96-3 (CANH) - X96-9 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Absorber control ECU
      X96-4 (CANH) - X96-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      X96-6 (CANH) - X96-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Skid control ECU assembly
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal CAN main wire) B
      NG (No. 2 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 12 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

    D

    GO TO STEP 20 Click here

    C

  16. CONNECT CONNECTOR


    1. Reconnect the X96 No. 12 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the No. 2 CAN junction connector.

      B000ZBKC13
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to Pedestrian Detection ECU Assembly
      *c to Front Steering Control ECU (w/ Variable Gear Ratio Steering System) *d to Yaw Rate Sensor
      *e to Airbag ECU Assembly *f to Steering Sensor
      *g to No. 13 CAN Junction Connector *h to No. 12 CAN Junction Connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      P108-1 (CANH) - P108-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Pedestrian detection ECU assembly
      P108-2 (CANH) - P108-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front steering control ECU*
      P108-4 (CANH) - P108-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Yaw rate sensor
      P108-5 (CANH) - P108-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Airbag ECU assembly
      P108-6 (CANH) - P108-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Steering sensor
      P108-7 (CANH) - P108-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 13 CAN junction connector
      P108-8 (CANH) - P108-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 12 CAN junction connector
      *: w/ Variable Gear Ratio Steering System
      Result
      Result Proceed to
      OK A
      NG (No. 12 CAN junction connector CAN main wire) B
      NG (No. 13 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR)

    D

    GO TO STEP 20 Click here

    C

  18. CONNECT CONNECTOR


    1. Reconnect the P108 No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT

  19. CHECK FOR SHORT IN CAN BUS WIRES (NO. 13 CAN JUNCTION CONNECTOR)

    Tech Tips


    • Before disconnecting the connectors, make a note of where it is connected.

    • Reconnect the connector to its original position.


    1. Disconnect the No. 13 CAN junction connectors.

      B000XRKC03
      *1 No. 13 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 13 CAN Junction Connector)

      		 - -
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connect to
      X100 V P Parking brake ECU assembly
      X101 LG P Rear steering control ECU*
      X102 B P Rack and pinion power steering gear assembly
      X103 GR P No. 2 CAN junction connector
      X105 L P Central gateway ECU (network gateway ECU)
      X107 R P No. 3 CAN junction terminal

      *: w/ Dynamic Rear Steering System

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X100-1 (CANH) - X100-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Parking brake ECU assembly
      X101-1 (CANH) - X101-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rear steering control ECU*
      X102-1 (CANH) - X102-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rack and pinion power steering gear assembly
      X103-1 (CANH) - X103-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      X105-1 (CANH) - X105-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Central gateway ECU (network gateway ECU)
      X107-1 (CANH) - X107-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 3 CAN junction terminal
      *: w/ Dynamic Rear Steering System
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction connector CAN main wire) B
      NG (No. 3 CAN junction terminal CAN main wire) C
      NG (Central gateway ECU [network gateway ECU] CAN branch wire) D
      NG (Wire to ECU or sensor) E

    A

    REPLACE NO. 13 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 13 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 13 CAN JUNCTION CONNECTOR - NO. 3 CAN JUNCTION TERMINAL)

    D

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 13 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU])

    E

  20. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)


    1. B000W3PC42
      *a

      Component with harness connected

      (Central Gateway ECU [Network Gateway ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P59-22 (CA2H) - P59-7 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Tech Tips

      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 HARNESS OR CONNECTOR