Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H78R
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table.
  • Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Power Steering System

Symptom

Suspected Area

Link

Heavy steering

Front tires (improperly inflated, unevenly worn)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION

Front wheel alignment (incorrect)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2020]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2020 - 06/2021]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2021 - 09/2022]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT

Front suspension (Lower ball joint)

2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; FRONT SUSPENSION: FRONT LOWER BALL JOINT: INSPECTION

Steering gear assembly

2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; STEERING GEAR / LINKAGE: STEERING GEAR: REMOVAL

Auxiliary battery and power source circuit

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (BATTERY / CHARGING): CHARGING SYSTEM: ON-VEHICLE INSPECTION

Power source voltage of power steering ECU with motor assembly

2020 - 2021 MY Corolla Corolla HV [01/2019 - 06/2021]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): TERMINALS OF ECU 2022 MY Corolla Corolla HV [06/2021 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): TERMINALS OF ECU

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

Vehicle condition (Steering wheel is turned from left to right repeatedly with vehicle stopped or heavy load is continuously applied to vehicle)

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DATA LIST / ACTIVE TEST

Steering effort differs between right and left or is uneven

Power steering ECU zero point calibrationnot completed

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

Front tires (improperly inflated, unevenly worn)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION

Front wheel alignment (incorrect)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2020]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2020 - 06/2021]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2021 - 09/2022]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT

Front suspension (Lower ball joint)

2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; FRONT SUSPENSION: FRONT LOWER BALL JOINT: INSPECTION

Steering gear assembly

2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; STEERING GEAR / LINKAGE: STEERING GEAR: REMOVAL

Torque sensor (Electric power steering column sub-assembly)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

Electric power steering column sub-assembly

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

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

While driving, steering effort does not change in accordance with vehicle speed, or steering wheel does not return to its centered position easily

Skid control ECU (Brake booster with master cylinder assembly)

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (for HV Model): REMOVAL

Speed sensor

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): DTC CHECK / CLEAR

Torque sensor (Electric power steering column sub-assembly)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

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

CAN communication system

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

Friction sounds occur when turning steering wheel during low speed driving

Power steering motor (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

Electric power steering column sub-assembly

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

Spiral with cable sensor sub-assembly

2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: INSPECTION

Steering column cover contacting steering wheel assembly

2020 - 2025 MY Corolla Corolla Hatchback Corolla HV [01/2019 -        ]; STEERING COLUMN: STEERING WHEEL (except G16E-GTS): INSTALLATION

High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped

Power steering motor (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

Steering wheel installation (incorrect)

2020 - 2025 MY Corolla Corolla Hatchback Corolla HV [01/2019 -        ]; STEERING COLUMN: STEERING WHEEL (except G16E-GTS): INSTALLATION

Steering wheel vibrates and noise occurs when turning steering wheel from lock to lock

Power steering motor (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

Electric power steering column sub-assembly

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

Steering wheel installation (incorrect)

2020 - 2025 MY Corolla Corolla Hatchback Corolla HV [01/2019 -        ]; STEERING COLUMN: STEERING WHEEL (except G16E-GTS): INSTALLATION

EPS warning light remains on

EPS warning light circuit

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): EPS Warning Light Circuit