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 yaw rate sensor to specify 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

A0138M2E02

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 light reminder warning system is 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 CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)


    1. A0137APE01

      Turn the ignition switch off.

    2. Disconnect the H25 yaw rate sensor connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Proceed to
      H25-3 (CANH) - H25-1 (CANL) Ignition switch off 54 to 69 Ω OK
      H25-3 (CANH) - H25-1 (CANL) Ignition switch off 69 Ω or higher NG-A
      H25-3 (CANH) - H25-1 (CANL) Ignition switch off 54 Ω or less NG-B

    NG-A

    CHECK CAN MAIN WIRE FOR DISCONNECTION Click here

    NG-B

    CHECK CAN BUS LINES FOR SHORT CIRCUIT Click here

    OK

  2. CHECK CAN BUS LINE FOR SHORT TO +B


    1. A0135XAE01

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H25-3 (CANH) - C16-16 (BAT) Ignition switch off 6 kΩ or higher
      H25-1 (CANL) - C16-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK CAN BUS LINE FOR SHORT TO +B Click here

    OK

  3. CHECK CAN BUS LINE FOR SHORT TO GND


    1. A0135XAE02

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H25-3 (CANH) - C16-4 (CG) Ignition switch off 200 Ω or higher
      H25-1 (CANL) - C16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK CAN BUS LINE FOR SHORT TO GND Click here

    OK

    GO TO HOW TO PROCEED WITH TROUBLESHOOTING Click here