ANTI-LOCK BRAKE SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION

    When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the GTS to the vehicle and reading various data output from the vehicle's skid control ECU (brake actuator assembly).

    The skid control ECU (brake actuator assembly) records DTCs when the ECU detects a malfunction in the ECU itself or in its circuits.

    To check the DTCs, connect the GTS to the DLC3 on the vehicle. The GTS enables you to clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.


    1. Check the battery voltage.

      If the voltage is below 11 V, recharge the battery before proceeding to the next step.

    2. Check the DLC3.

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    3. DIAGNOSIS


      1. If the skid control ECU (brake actuator assembly) detects a malfunction, the ABS warning and brake warning will come on in order to warn the driver.

      2. The DTCs are simultaneously stored in memory. The DTCs can be read by connecting SST between terminals TC and CG of the DLC3 and observing the blinking pattern of the ABS warning light, or by connecting the GTS.

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      3. This system has a Test Mode (signal check) function.

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    4. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


      1. When the ignition switch is turned to ON, check that the ABS warning and brake warning lights come on for approximately 3 seconds.

        Tech Tips


        • When the brake fluid level is low, the brake warning light comes on.

        • If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning and brake warning light circuits. If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

      5. Trouble Area See procedure
      ABS warning light circuit (Remains on)

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      ABS warning light circuit (Does not come on)

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      Brake warning light circuit (Remains on)

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      Brake warning light circuit (Does not come on)

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