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ABS Control Inspection

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform "Preparation".
  2. Connect the WDS or equivalent to the DLC-2.
    Fig 1: Identifying Data Link Connector-2
    G03702455Courtesy of MAZDA MOTORS CORP.
  3. Set up an active command mode inspection according to the combination of commands below.
    BRAKE PRESSURE RETENTION

    Command name Inspected wheels
    LF RF LR RR
    LF_TC_VLV OFF
    RF_TC_VLV
    LF_DSC_V
    RF_DSC_V
    ABS_POWER ON
    LF INLET ON OFF OFF OFF
    LF_OUTLET OFF
    LR_INLET ON
    LR_OUTLET OFF
    RF_INLET ON
    RF_OUTLET OFF
    RR_INLET ON
    RR_OUTLET OFF
    PMP_MOTOR
    BRAKE PRESSURE REDUCTION

    Command name Inspected wheels
    LF RF LR RR
    LF_TC_VLV OFF
    RF_TC_VLV
    LF_DSC_V
    RF_DSC_V
    ABS_POWER ON
    LF_INLET ON OFF OFF OFF
    LF_OUTLET
    LR_INLET OFF ON
    LR_OUTLET
    RF_INLET ON OFF
    RF_OUTLET
    RR_INLET OFF ON
    RR_OUTLET
    PMP_MOTOR ON
    CAUTION:
    • To protect the DSC HU/CM, the solenoid valve and the pump motor used during active command mode stay on for only 10 s or less each time they are switched on.
    NOTE:
    • When working with two people, one should press on the brake pedal, and the other should attempt to rotate the wheel being inspected.
  4. Send the command while depressing on the brake pedal and attempting to rotate the wheel being inspected.
  5. While brake pressure is maintained and a DSC HU/CM operation click sound is heard, confirm that the wheel does not rotate. While brake pressure is being reduced and an DSC HU/CM operation click sound is heard, confirm that the wheel rotates.
    • Performing the inspection above determines the following:
      • The DSC HU/CM brake lines are normal.
      • The DSC HU/CM hydraulic system is not significantly abnormal (including DSC HU/CM).
      • The DSC HU/CM internal electrical parts (solenoid, motor and other parts) are normal.
      • The DSC unit and DSC HU/CM output system wiring harnesses (solenoid valve, relay system) are normal.
    • However, the following items cannot be verified.
      • Malfunction with intermittent occurrence of the above items
      • Malfunction of DSC HU/CM input system wiring harnesses and parts
      • Extremely small leaks in the DSC HU/CM internal hydraulic system
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