Toyota Yaris: Power Steering System / Fail-safe Chart

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / Fail-safe Chart

FAIL-SAFE CHART

If a problem occurs in the power steering system, the power steering assist will be stopped or the amount of power assist will be decreased to protect the system.

Power Steering System

Malfunction	Fail-safe Operation	EPS warning light	Buzzer
Torque sensor (electric power steering column sub-assembly) malfunction Power steering motor (power steering ECU assembly) malfunction Power steering ECU assembly malfunction	Power steering assist stops or assist amount is limited	Red or yellow	Sounds intermittently or once
Vehicle speed signal malfunction Skid control ECU (brake actuator assembly) malfunction Decrease in battery voltage (not malfunction)	Power steering assist is temporarily limited	Yellow	Sounds once

HINT:

If the power steering assist stops, the EPS warning light comes on (red).
If the amount of power assist is reduced, the EPS warning light comes on (yellow) and a vibration or sound may occur.
The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or being driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal when the steering wheel is not turned for approximately 10 minutes with the engine running.
If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the EPS warning light will come on. In such cases, the amount of power assist returns to normal when the auxiliary battery voltage recovers.

Freeze Frame Data

FREEZE FRAME DATA FREEZE FRAME DATA NOTICE: It is difficult to show the specified values (judgment values) clearly because freeze frame data values change significantly due to differences in measurement conditions, surroundings, or vehicle conditions...

Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...

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