CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) Check CAN Bus Lines for Short Circuit (RHD Models)

DESCRIPTION

There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

  • Short between CAN bus lines

  • ECM

  • Combination meter assembly

  • Center airbag sensor assembly

  • Skid control ECU (brake actuator assembly)

  • Main body ECU (multiplex network body ECU)

  • Power steering ECU assembly

  • Certification ECU (smart key ECU assembly)*1

  • Steering angle sensor (spiral cable sub-assembly)*2

  • Radio receiver assembly*3

  • Air conditioning amplifier assembly*4

  • Engine stop and start ECU*5

  • No. 1 junction connector

  • No. 2 junction connector

WIRING DIAGRAM

A01VETVE03
A01VENIE06

CAUTION / NOTICE / HINT

Note


  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. CHECK SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE)


    1. Turn the ignition switch off.

    2. Disconnect the F83 No. 2 junction connector.

    3. A01VLJ8E01
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F4-6 (CANH) - F4-14 (CANL) Ignition switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (DLC3 BRANCH WIRE)

    OK

  2. CONNECT CONNECTOR


    1. Reconnect the F83 No. 2 junction connector.


    NEXT

  3. CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR)


    1. Disconnect the A61 and F82 No. 1 junction connectors.

    2. A01VLJ8E01
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F4-6 (CANH) - F4-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) Click here

    OK

  4. CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ECM)


    1. A01VF6VE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-9 (CANH) - A61-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK SHORT IN CAN BUS WIRES (ECM MAIN WIRE) Click here

    OK

  5. CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)


    1. A01VGW1E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-10 (CANH) - A61-21 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE) Click here

    OK

  6. CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ENGINE STOP AND START ECU)

    Tech Tips

    For vehicles without stop and start system, go to step 7.


    1. A01VI3KE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F82-5 (CANH) - F82-16 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (ENGINE STOP AND START ECU BRANCH WIRE) Click here

    OK

  7. CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. A01VLP5E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F82-1 (CANH) - F82-12 (CANL) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    CHECK SHORT IN CAN BUS WIRES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE) Click here

  8. CHECK SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. Disconnect the F83 No. 2 junction connector.

    2. A01VIENE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F82-4 (CANH) - F82-15 (CANL) Ignition switch off 1 MΩ or higher

    NG

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

    OK

  9. CONNECT CONNECTOR


    1. Reconnect the A61 and F82 No. 1 junction connectors.


    NEXT

  10. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. A01VGAAE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-7 (CANH) - F83-18 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY MAIN WIRE) Click here

    OK

  11. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    Tech Tips

    For vehicles without Air Conditioning System or PTC heater, go to step 12.


    1. A01VM1UE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-8 (CANH) - F83-19 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE) Click here

    OK

  12. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY))

    Tech Tips

    For vehicles without VSC, go to step 13.


    1. A01VFGVE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-1 (CANH) - F83-12 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE) Click here

    OK

  13. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - POWER STEERING ECU ASSEMBLY)


    1. A01VJ3VE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-6 (CANH) - F83-17 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (POWER STEERING ECU ASSEMBLY) Click here

    OK

  14. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - RADIO RECEIVER ASSEMBLY)

    Tech Tips

    For vehicles without display audio type, go to step 15.


    1. A01VFTPE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-5 (CANH) - F83-16 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (RADIO RECEIVER ASSEMBLY BRANCH WIRE) Click here

    OK

  15. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

    Tech Tips

    For vehicles without entry and start system, go to step 16.


    1. A01VJ78E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-3 (CANH) - F83-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT IN CAN BUS WIRES (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH WIRE) Click here

    OK

  16. CHECK SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A01VIX8E03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-4 (CANH) - F83-15 (CANL) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

    CHECK SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE) Click here

  17. CHECK SHORT IN CAN BUS WIRES (ECM MAIN WIRE)


    1. Disconnect the A58*1, A71*2 or A59*3 ECM connector.

      *1: for 1NR-FE

      *2: for 1KR-FE

      *3: for 1ND-TV

    2. A01VF6VE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-9 (CANH) - A61-20 (CANL) Ignition switch off 1 MΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for 1NR-FE) B
      OK (for 1KR-FE) C
      OK (for 1ND-TV) D

    A

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM MAIN WIRE)

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

  18. CHECK SHORT IN CAN BUS WIRES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)


    1. Disconnect the A54*1 or A78*2 skid control ECU (brake actuator assembly) connector.

      *1: for TMC Made

      *2: for TMMF Made

    2. A01VGW1E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-10 (CANH) - A61-21 (CANL) Ignition switch off 1 MΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for TMC Made) B
      OK (for TMMF Made) C

    A

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)

    B

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    C

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

  19. CHECK SHORT IN CAN BUS WIRES (ENGINE STOP AND START ECU BRANCH WIRE)


    1. Disconnect the F75 engine stop and start ECU connector.

    2. A01VI3KE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F82-5 (CANH) - F82-16 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE ENGINE STOP AND START ECU

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (ENGINE STOP AND START ECU BRANCH WIRE)

  20. CHECK SHORT IN CAN BUS WIRES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)


    1. Disconnect the F76 main body ECU (multiplex network body ECU) connector.

    2. A01VLP5E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F82-1 (CANH) - F82-12 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)

  21. CHECK SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY MAIN WIRE)


    1. Disconnect the F1 combination meter assembly connector.

    2. A01VGAAE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-7 (CANH) - F83-18 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY MAIN WIRE)

  22. CHECK SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)


    1. Disconnect the F42*1 or F41*2 air conditioning amplifier assembly connector.

      *1: w/ Automatic Air Conditioning System

      *2: w/ Manual Air Conditioning System or PTC Heater

    2. A01VM1UE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-8 (CANH) - F83-19 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

  23. CHECK SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)


    1. Disconnect the F30 steering angle sensor (spiral cable sub-assembly) connector.

    2. A01VFGVE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-1 (CANH) - F83-12 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)

  24. CHECK SHORT IN CAN BUS WIRES (POWER STEERING ECU ASSEMBLY)


    1. Disconnect the F6 power steering ECU assembly connector.

    2. A01VJ3VE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-6 (CANH) - F83-17 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POWER STEERING ECU ASSEMBLY BRANCH WIRE)

  25. CHECK SHORT IN CAN BUS WIRES (RADIO RECEIVER ASSEMBLY BRANCH WIRE)


    1. Disconnect the F115 radio receiver assembly connector.

    2. A01VFTPE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-5 (CANH) - F83-16 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (RADIO RECEIVER ASSEMBLY BRANCH WIRE)

  26. CHECK SHORT IN CAN BUS WIRES (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH WIRE)


    1. Disconnect the F63 certification ECU (smart key ECU assembly) connector.

    2. A01VJ78E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-3 (CANH) - F83-14 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH WIRE)

  27. CHECK SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)


    1. Disconnect the F16 center airbag sensor assembly connector.

    2. A01VIX8E03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-4 (CANH) - F83-15 (CANL) Ignition switch off 1 MΩ or higher

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)