ANTI-LOCK BRAKE SYSTEM PRECAUTION


  1. IGNITION SWITCH EXPRESSION

    Tech Tips

    The type of ignition switch used on this model differs according to the specifications of the vehicle.

    The expressions listed in the table below are used in this section.

    Expression Ignition Switch (Position) Engine Switch (Condition)
    Ignition switch off LOCK Off
    Ignition switch ACC ACC On (ACC)
    Ignition switch ON ON On (IG)
    Engine Start START Start

  2. TROUBLESHOOTING PRECAUTIONS


    1. When there are malfunctions with terminal contact points or part installation problems, removal and installation of the suspected problem parts may return the system to the normal condition either completely or temporarily.

    2. In order to determine the malfunctioning area, check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record them before disconnecting each connector or removing and installing parts.

    3. Since the system may be influenced by malfunctions in systems other than the ABS system, be sure to check for DTCs in other systems.

  3. HANDLING PRECAUTIONS


    1. Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the ignition switch off unless otherwise specified in the inspection procedure.

    2. If the ECU, brake actuator or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the intelligent tester, and also check that system functions and signals received by the ECU are normal using Test Mode.

    3. If replacing the brake actuator assembly (skid control ECU), always replace it with a new one (if the brake actuator assembly (skid control ECU) is not replaced with a new one, DTCs may be stored).

      Note

      Do not use a brake actuator assembly (skid control ECU) from another vehicle. (display model, etc.)

  4. DTC PRECAUTION


    1. Some DTCs cannot be cleared only by repairing the malfunctioning parts. If the DTC is output after repair work, turn the ignition switch off to clear the DTC.

      Note

      If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.

  5. CAN COMMUNICATION SYSTEM PRECAUTIONS


    1. The CAN communication system is used for data communication among the skid control ECU other ECUs. If there is trouble in the CAN communication line, corresponding communication line DTCs are output.

    2. If any CAN communication line DTC is output, repair the malfunction in the communication line and troubleshoot the ABS system after data communication becomes normal.

    3. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires of equal length. A bypass wire should not be used because the data being transmitted will be corrupted.