CAN COMMUNICATION SYSTEM Check CAN Bus Line

DESCRIPTION

When any DTC for the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to determine the trouble area, and check that there is no short in the CAN main wire, between the CAN bus lines, to +B, or to GND.

WIRING DIAGRAM

A011BAFE03
A0118ZVE02
A0118BSE02
A0117V2E02

INSPECTION PROCEDURE

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. SYSTEM CHECK


    1. Check the vehicle specifications.

      Result
      Result Proceed to
      w/o Stop and Start System A
      w/ Stop and Start System B

    B

    CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT) Click here

    A

  2. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)


    1. Turn the ignition switch off.

    2. A011935E01
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Proceed to
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 54 to 69 Ω A
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 70 Ω or higher B
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 53 Ω or less C

    B

    CHECK CAN MAIN WIRE FOR DISCONNECTION Click here

    C

    CHECK CAN BUS LINES FOR SHORT CIRCUIT Click here

    A

  3. CHECK FOR SHORT TO B+ IN CAN BUS WIRE


    1. A011935E02
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D47-6 (CANH) - D47-16 (BAT) Ignition switch off 6 kΩ or higher
      D47-14 (CANL) - D47-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK CAN BUS LINE FOR SHORT TO +B Click here

    OK

  4. CHECK CAN BUS LINE FOR SHORT TO GND


    1. A011935E03
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D47-6 (CANH) - D47-4 (CG) Ignition switch off 200 Ω or higher
      D47-14 (CANL) - D47-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK CAN BUS LINE FOR SHORT TO GND Click here

    OK

    HOW TO PROCEED WITH TROUBLESHOOTING Click here

  5. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)


    1. Turn the ignition switch off.

    2. A011935E01
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Proceed to
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 54 to 69 Ω A
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 70 Ω or higher B
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 53 Ω or less C

    B

    CHECK CAN MAIN WIRE FOR DISCONNECTION Click here

    C

    CHECK CAN BUS LINES FOR SHORT CIRCUIT Click here

    A

  6. CHECK FOR SHORT TO B+ IN CAN BUS WIRE


    1. A011935E02
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D47-6 (CANH) - D47-16 (BAT) Ignition switch off 6 kΩ or higher
      D47-14 (CANL) - D47-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK CAN BUS LINE FOR SHORT TO +B Click here

    OK

  7. CHECK CAN BUS LINE FOR SHORT TO GND


    1. A011935E03
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D47-6 (CANH) - D47-4 (CG) Ignition switch off 200 Ω or higher
      D47-14 (CANL) - D47-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK CAN BUS LINE FOR SHORT TO GND Click here

    OK

    HOW TO PROCEED WITH TROUBLESHOOTING Click here