CAN COMMUNICATION SYSTEM Skid Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Skid Control ECU Communication Stop Mode

  • "ABS/VSC/TRC" is not displayed on "Communication Bus Check" screen of intelligent tester

  • Applies to "Skid Control ECU Communication Stop Mode" in "DTC COMBINATION TABLE"

  • Power source circuit of skid control ECU

  • Skid control ECU branch wire or connector

  • Skid control ECU

WIRING DIAGRAM

A017B5GE34

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 the doors need to be opened in order to check the connectors, open the doors and leave them open.

Tech Tips


  • Operating the ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

PROCEDURE


  1. CHECK CAN BUS WIRE FOR DISCONNECTION (SKID CONTROL ECU BRANCH WIRE)


    1. Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

    3. A017C50E48

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A24-25 (CANH) - A24-14 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (IG1, GND1)


    1. Disconnect the skid control ECU connector.

    2. A017C50E49

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A24-1 (GND1) - Body ground Always Below 1 Ω

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

      Standard voltage
      Tester Connection Condition Specified Condition
      A24-34 (IG1) - Body ground Ignition switch on (IG) 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DTC OUTPUT


    1. Check the skid control ECU output DTC Click here.

    2. Read the DTC.

      OK
      C1241 is not stored.

    NG

    GO TO DTC CHART (C1241) Click here

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here