Toyota Yaris: Vehicle Stability Control System / Diagnosis System

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Diagnosis System

DIAGNOSIS SYSTEM

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.

(a) Check the auxiliary battery voltage.

Standard voltage:

11 to 14 V

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

(b) Check the DLC3.

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DIAGNOSIS

(a) 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 system warning light or slip indicator light).

(b) The DTCs are simultaneously stored in memory. The DTCs can be read by connecting the GTS.

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WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

(a) When the ignition switch is turned to ON, check that the ABS warning light, brake system warning light, VSC OFF indicator light and slip indicator light come on for approximately 3 seconds.

HINT:

When the brake fluid level is low, the brake system 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 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).

Trouble Area	See procedure
ABS warning light circuit (Remains on)
ABS warning light circuit (Does not come on)
Brake warning light circuit (Remains on)
Brake warning light circuit (Does not come on)
VSC OFF indicator light circuit (Remains on)
VSC OFF indicator light circuit (Does not come on)
Slip indicator light circuit (Remains on)
Slip indicator light circuit (Does not come on)

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE If there are no DTCs output and the problem still occurs, check the suspected areas for each problem symptom in the order given in the following table and proceed to the relevant troubleshooting page...

Terminals Of Ecu

TERMINALS OF ECU TERMINALS OF ECU *a Component without harness connected (Skid Control ECU [Brake Actuator Assembly]) - - Terminal No...

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