Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001H78P
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 -           ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING; 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the power steering system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

INSPECT AUXILIARY BATTERY

(a) Turn the power switch off.

(b) Measure the voltage of the auxiliary battery.

Standard Voltage:

11 to 14 V

HINT:

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

NEXT

3.

CHECK DTC AND FREEZE FRAME DATA*

HINT:

Refer to DTC Check / Clear.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DTC CHECK / CLEAR

Chassis > EMPS > Trouble Codes

NEXT

4.

PROBLEM SYMPTOM CONFIRMATION

Result

Proceed to

Symptom does not occur.

A

Symptom occurs.

B
B

GO TO STEP 6

A

5.

SYMPTOM SIMULATION
NEXT

6.

CHECK CAN COMMUNICATION SYSTEM*

(a) Check for DTCs.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

Result

Proceed to

CAN communication system DTCs are not output.

A

CAN communication system DTCs are output.

B

HINT:

  • If any CAN communication system DTCs are output, perform troubleshooting for the CAN communication system first.
  • If communication to the power steering ECU assembly cannot be established through the Techstream, inspect terminals CANH and CANL of the DLC3 and the power steering ECU assembly, and the IG circuit of the power steering ECU assembly.
B

PROCEED TO 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 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

A

7.

CHECK FOR DTC*

(a) Check for DTCs.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DTC CHECK / CLEAR

Chassis > EMPS > Trouble Codes

HINT:

Refer to Diagnostic Trouble Code Chart when any DTCs are output.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART

Result

Proceed to

DTCs are not output.

A

DTCs are output.

B
B

GO TO STEP 10

A

8.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE

Result

Proceed to

Fault is not listed in Problem Symptoms Table.

A

Fault is listed in Problem Symptoms Table.

B
B

GO TO STEP 10

A

9.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Refer to Terminals of ECU.

Click here 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 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): TERMINALS OF ECU

(b) Refer to Data List / Active Test.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DATA LIST / ACTIVE TEST 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): DATA LIST / ACTIVE TEST

NEXT

10.

REPAIR OR REPLACE
NEXT

11.

CONFIRMATION TEST
NEXT

END