Toyota Yaris: Power Steering System / EPS Warning Light Circuit

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / EPS Warning Light Circuit

DESCRIPTION

Use the following procedure if no DTCs are output but the EPS warning light is illuminated continuously.

The power steering ECU assembly controls the warning light in the combination meter assembly via CAN communication.

CAUTION / NOTICE / HINT

NOTICE:

When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).

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PROCEDURE

1.	CHECK VEHICLE CONTROL HISTORY (POWER STEERING SYSTEM)

(a) Enter the following menus: Chassis / EMPS / Utility / Vehicle Control History (RoB).

Chassis > EMPS > Utility

Tester Display
Vehicle Control History (RoB)

HINT:

The EPS warning light illuminates if any vehicle control history is stored.

Result	Proceed to
Vehicle control history not stored for power steering ECU assembly	A
Vehicle control history stored for power steering ECU assembly	B

PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY

2.	INSPECT COMBINATION METER ASSEMBLY

(a) Perform the Active Test of the combination meter assembly using the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display
EPS Warning

(b) Check the combination meter assembly.

OK:

The EPS warning light turns on or off in accordance with the GTS operation.

REPLACE POWER STEERING ECU ASSEMBLY

GO TO METER / GAUGE SYSTEM

Heavy Steering Feel (EPS Warning Light (Yellow))

PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List according to the display on the GTS. Chassis > EMPS > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Battery Voltage Drop History Number of times vehicle auxiliary battery voltage dropped Min...

Steering Column

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: VEHICLE CONTROL HISTORY (RoB)

VEHICLE CONTROL HISTORY (RoB) NOTICE: Replacing or repairing related components may cause vehicle control history codes to be stored. When checking the vehicle control history, make sure to record the output histories. Then, clear the histories and recheck the output histories again...

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Data List / Active Test

DATA LIST / ACTIVE TEST READ DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows values or states of switches, sensors, actuators and other items to be read without removing any parts...