VEHICLE STABILITY CONTROL SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION

    When troubleshooting a vehicle using 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 skid control ECU (brake actuator assembly).

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

    To check for DTCs, connect the GTS to the DLC3 on the vehicle. The GTS can be used to clear the DTCs, activate 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, brake warning, and/or slip indicator lights will come on in order to warn the driver.

      2. 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 and slip indicator lights, or by connecting the GTS.

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

        The DTCs can be read by connecting SST between terminals TS and CG of the DLC3 and observing the blinking pattern of the ABS warning and slip indicator lights, or by connecting the GTS.

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    4. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


      1. When the engine switch is turned on (IG), check that the ABS warning, brake warning, TRC OFF indicator, VSC OFF indicator and slip indicator lights all 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, brake warning, TRC OFF indicator, VSC OFF indicator and slip indicator light circuits.

        • If any of the indicators 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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      TRC OFF indicator light circuit (Remains on)

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      TRC OFF indicator light circuit (Does not come on)

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      VSC OFF indicator light circuit (Remains on)

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      VSC OFF indicator light circuit (Does not come on)

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      Slip indicator light circuit (Remains on)

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      Slip indicator light circuit (Does not come on)

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