CAN COMMUNICATION SYSTEM Skid Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Skid Control ECU Communication Stop Mode

  • "Skid Control (ABS/VSC/TRAC)" is not displayed on "CAN Bus Check" screen of the GTS.

  • Applies to Skid Control ECU Communication Stop Mode in DTC Combination Table.

  • Brake booster with master cylinder (Skid control ECU) branch wire or connector

  • Power source circuit of brake booster with master cylinder (skid control ECU)

  • Brake booster with master cylinder (Skid control ECU)

WIRING DIAGRAM

A0043TZE04
A0043TZE06

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN main bus wires and between CAN main bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

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

Tech Tips


  • Operating the power 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 may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK DTC (BRAKE SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.

      OK
      DTC C1241 is not output.

    NG

    GO TO CIRCUITS INDICATED BY OUTPUT DTC Click here

    OK

  2. CHECK FOR OPEN IN CAN BUS WIRES (SKID CONTROL ECU BRANCH WIRE)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. A0044BAE84
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Booster with Master Cylinder (Skid Control ECU))

      Disconnect the A57 brake booster with master cylinder (skid control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A57-37 (CA1H) - A57-38 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (SKID CONTROL ECU) Click here

    C

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

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (SKID CONTROL ECU) Click here