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Check CAN Bus Lines for Short Circuit: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CAN BUS WIRE (DLC3 SUB BUS LINE) 
    1. Turn the ignition switch off.
    2. Disconnect the connector from CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying DLC3 Branch Wire And Can No. 1 Bus Circuit Main Wire
      GTY304361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard resistance

      Tester Connection Condition Specified value
      D20-6 (CANH) - D20-14 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR 

    OK: Go to next step 

  2. CHECK CAN BUS WIRE (NETWORK GATEWAY ECU SUB BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying Network Gateway ECU Connector Terminals)
      GTY304783Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Network Gateway ECU

      Standard resistance

      Tester Connection Condition Specified value
      D73-6 (CANH) - D73-17 (CANL) Ignition switch off 200 Ω or more

    NG → See step   9 

    OK: Go to next step 

  3. CHECK CAN BUS WIRE (ECM MAIN BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 3: Identifying CAN Bus Wire (ECM) Connector Terminals
      GTY304784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to ECM

      Standard resistance

      Tester Connection Condition Specified value
      D73-10 (CANH) - D73-21 (CANL) Ignition switch off 108 to 132 Ω

    NG → See step   10 

    OK: Go to next step 

  4. CHECK CAN BUS WIRE (YAW RATE SENSOR SUB BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying CAN Bus Wire (Yaw Rate Sensor) Connector Terminals
      GTY307622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Yaw Rate Sensor

      Standard resistance

      Tester Connection Condition Specified value
      D73-2 (CANH) - D73-13 (CANL) Ignition switch off 200 Ω or more

    NG → See step   11 

    OK: Go to next step 

  5. CHECK CAN BUS WIRE (STEERING ANGLE SENSOR SUB BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 5: Identifying CAN Bus Wire (Steering Angle Sensor Sub Bus Line) Connector Terminals
      GTY304782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Steering Angle Sensor

      Standard resistance

      Tester Connection Condition Specified value
      D73-4 (CANH) - D73-15 (CANL) Ignition switch off 200 Ω or more

    NG → See step   12 

    OK: Go to next step 

  6. CHECK CAN BUS WIRE (SKID CONTROL ECU MAIN BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 6: Identifying CAN Bus Wire (Skid Control ECU Main Bus Line) Connector Terminals
      GTY304786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Skid Control ECU

      Standard resistance

      Tester Connection Condition Specified value
      D73-9 (CANH) - D73-20 (CANL) Ignition switch off 108 to 132 Ω

    NG → See step   13 

    OK: Go to next step 

  7. CHECK CAN BUS WIRE (NAVIGATION ECU SUB BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 7: Identifying CAN Bus Wire (Navigation ECU Sub Bus Line) Connector Terminals
      GTY304805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Navigation ECU

      Standard resistance

      Tester Connection Condition Specified value
      D73-7 (CANH) - D73-18 (CANL) Ignition switch off 200 Ω or more

    NG → See step   14 

    OK: Go to next step 

  8. CHECK CAN BUS WIRE (CENTER AIRBAG SENSOR ASSEMBLY SUB BUS LINE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 8: Identifying CAN Bus Wire (Center Airbag Sensor Assembly Sub Bus Line) Connector Terminals
      GTY304785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Center Airbag Sensor Assembly

      Standard resistance

      Tester Connection Condition Specified value
      D73-8 (CANH) - D73-19 (CANL) Ignition switch off 200 Ω or more

    NG → See step   15 

    OK → REPLACE JUNCTION CONNECTOR (CAN J/C) 

  9. CHECK CAN BUS WIRE (NETWORK GATEWAY ECU) 
    1. Disconnect the network gateway ECU connector (E23).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 9: Identifying Network Gateway ECU Connector Terminals
      GTY304783Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Network Gateway ECU

      Standard resistance

      Tester Connection Condition Specified value
      D73-6 (CANH) - D73-17 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE NETWORK GATEWAY ECU SUB BUS LINE OR CONNECTOR 

    OK → REPLACE NETWORK GATEWAY ECU 

  10. CHECK CAN BUS WIRE (ECM) 
    1. Disconnect the ECM connector (A55).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 10: Identifying CAN Bus Wire (ECM) Connector Terminals
      GTY304784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to ECM

      Standard resistance

      Tester Connection Condition Specified value
      D73-10 (CANH) - D73-21 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR 

    OK → See step   16 

  11. CHECK CAN BUS WIRE (YAW RATE SENSOR) 
    1. Disconnect the yaw rate sensor connector (D28).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 11: Identifying CAN Bus Wire (Yaw Rate Sensor) Connector Terminals
      GTY307622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Yaw Rate Sensor

      Standard resistance

      Tester Connection Condition Specified value
      D73-2 (CANH) - D73-13 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR 

    OK → See step   17 

  12. CHECK CAN BUS WIRE (STEERING ANGLE SENSOR) 
    1. Disconnect the steering angle sensor connector (D12).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 12: Identifying CAN Bus Wire (Steering Angle Sensor Sub Bus Line) Connector Terminals
      GTY304782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Steering Angle Sensor

      Standard resistance

      Tester Connection Condition Specified value
      D73-4 (CANH) - D73-15 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR 

    OK → See step   18 

  13. CHECK CAN BUS WIRE (SKID CONTROL ECU) 
    1. Disconnect the skid control ECU connector (A34).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 13: Identifying CAN Bus Wire (Skid Control ECU Main Bus Line) Connector Terminals
      GTY304786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Skid Control ECU

      Standard resistance

      Tester Connection Condition Specified value
      D73-9 (CANH) - D73-20 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE SKID CONTROL ECU MAIN BUS LINE OR CONNECTOR 

    OK → See step   19 

  14. CHECK CAN BUS WIRE (NAVIGATION ECU) 
    1. Disconnect the navigation ECU connector (E54).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 14: Identifying CAN Bus Wire (Navigation ECU Sub Bus Line) Connector Terminals
      GTY304805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Navigation ECU

      Standard resistance

      Tester Connection Condition Specified value
      D73-7 (CANH) - D73-18 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE NAVIGATION ECU SUB BUS LINE OR CONNECTOR 

    OK → See step   20 

  15. CHECK CAN BUS WIRE (CENTER AIRBAG SENSOR ASSEMBLY) 
    1. Disconnect the center airbag sensor assembly connector (D23).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 15: Identifying CAN Bus Wire (Center Airbag Sensor Assembly Sub Bus Line) Connector Terminals
      GTY304785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector:
      (to CAN Junction Connector)      		 *b to Center Airbag Sensor Assembly

      Standard resistance

      Tester Connection Condition Specified value
      D73-8 (CANH) - D73-19 (CANL) Ignition switch off 1 MΩ or more

    NG → REPAIR OR REPLACE CENTER AIRBAG SENSOR ASSEMBLY SUB BUS LINE OR CONNECTOR 

    OK → REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

  16. REPLACE ECM. Refer to  REMOVAL 
  17. REPLACE YAW RATE AND ACCELERATION SENSOR. Refer to  REMOVAL 
  18. REPLACE STEERING ANGLE SENSOR. Refer to  REMOVAL 
  19. REPLACE SKID CONTROL ECU. Refer to  REMOVAL 
  20. REPLACE NAVIGATION ECU. Refer to  REMOVAL 
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