Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H796
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): EPS Warning Light Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

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 with motor assembly controls the warning light in the combination meter assembly via CAN communication.

CAUTION / NOTICE / HINT

NOTICE:

When the power steering ECU with motor assembly has been replaced, perform PowerSteering ECU Initial Setting (torque sensor zero point calibration and assist map writing).

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): CALIBRATION

PROCEDURE

1.

CHECK VEHICLE CONTROL HISTORY (POWER STEERING SYSTEM)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

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

(d) Using the Techstream, check for Vehicle Control History.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): VEHICLE CONTROL HISTORY

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 with motor assembly

A

Vehicle control history stored for power steering ECU with motor assembly

B
B

PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY

NOTICE:

After performing troubleshooting and repair regarding vehicle control history, clear the vehicle control history.
A

2.

INSPECT COMBINATION METER ASSEMBLY

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

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for HV Model): DATA LIST / ACTIVE TEST

Body Electrical > Combination Meter > Active Test

Tester Display

Multi Display All (White)

(b) Check the combination meter assembly.

OK:

The multi-information display in the combination meter assembly turns on according to the operation of the Active Test.

OK

REPLACE POWER STEERING ECU WITH MOTOR ASSEMBLY 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL

NG

GO TO METER / GAUGE SYSTEM