VEHICLE STABILITY CONTROL 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 a malfunction occurs in one part of the system, the skid control ECU (brake actuator assembly) illuminates the warning light corresponding to the malfunctioning system (ABS warning light, brake warning light or slip indicator light) or blinks the brake hold operated indicator light.

      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, slip indicator and brake hold standby indicator lights, 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. Check that the ABS warning light, VSC OFF indicator light, brake warning light, slip indicator light, brake hold standby indicator light and brake hold operated indicator light illuminate, and then turn off after approximately 3 seconds.

        Tech Tips


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

        • If a light does not illuminate, check the communication line between the combination meter assembly and skid control ECU (brake actuator assembly).

        • If the ABS warning light or slip indicator light remains illuminated after approximately 3 seconds or the brake hold operated indicator light blinks, check for DTCs and check the corresponding code. If no DTC is output, check the communication line between the combination meter assembly and skid control ECU (brake actuator assembly).

    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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      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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      Brake hold standby indicator light circuit

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      Brake hold operated indicator light circuit

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