Vehicle Stability Control System (For Hatchback With Built-In Type Yaw Rate Sensor) Diagnosis System

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

  1. DESCRIPTION

  1. DIAGNOSIS

  1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

Vehicle Stability Control System (For Hatchback With Built-In Type Yaw Rate Sensor) -- Diagnosis System



DESCRIPTION
When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream 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 Techstream to the DLC3 on the vehicle. The Techstream enables you to clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.

  1. Check the battery voltage.

    Standard voltage:
    11 to 14 V
    If the voltage is below 11 V, recharge the battery before proceeding to the next step.

  2. Check the DLC3 (YARIS_NCP93 RM000000UZ209YX.html).


DIAGNOSIS

  1. If the skid control ECU (brake actuator assembly) detects a malfunction, the ABS warning, brake warning, Slip indicator 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 and Slip indicator lights, or by connecting the Techstream (YARIS_NCP93 RM000000XHV0CQX.html).

  3. This system has a Test Mode (signal check) function (YARIS_NCP93 RM000000XHT098X.html).


WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

  1. Release the parking brake.

    NOTICE:
    When releasing the parking brake, move the shift lever to P (for CVT) or set chocks (except CVT) to prevent the vehicle from rolling.
    HINT:
    When the parking brake is applied or the level of the brake fluid is low, the brake warning light comes on.

  2. When the ignition switch is turned to ON, check that the ABS warning, brake warning, VSC OFF indicator, TRAC OFF indicator, and Slip indicator lights come on for approximately 3 seconds.

    HINT:
    If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning, brake warning, VSC OFF indicator, TRAC OFF indicator, and Slip indicator light circuits.
    If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below.
    Trouble Area
    		See procedure
    ABS warning light circuit (Remains on)
    		YARIS_NCP93 RM000000XIH0CBX.html
    ABS warning light circuit (Does not come on)
    		YARIS_NCP93 RM000000XIQ0C8X.html
    Brake warning light circuit (Remains on)
    		YARIS_NCP93 RM000000YHG0CDX.html
    Brake warning light circuit (Does not come on)
    		YARIS_NCP93 RM000000YHH0CCX.html
    TRAC OFF indicator light circuit (Remains on)
    		YARIS_NCP93 RM00000452200UX.html
    TRAC OFF indicator light circuit (Does not come on)
    		YARIS_NCP93 RM00000452300TX.html
    VSC OFF indicator light circuit (Remains on)
    		YARIS_NCP93 RM000001FQO0BFX.html
    VSC OFF indicator light circuit (Does not come on)
    		YARIS_NCP93 RM000001FQP0B5X.html
    Slip indicator light circuit (Remains on)
    		YARIS_NCP93 RM000000YHI091X.html
    Slip indicator light circuit (Does not come on)
    		YARIS_NCP93 RM000000YHJ090X.html