Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H790
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): C151162,C151187,C151262,C151287; Power Steering Torque Sensor "A" Signal Compare Failure; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C151162

Power Steering Torque Sensor "A" Signal Compare Failure

DTC

C151187

Power Steering Torque Sensor "A" Missing Message

DTC

C151262

Power Steering Torque Sensor "B" Signal Compare Failure

DTC

C151287

Power Steering Torque Sensor "B" Missing Message

DESCRIPTION

The power steering ECU with motor assembly supplies a voltage of 5 V to the torque sensor (electric power steering column sub-assembly) and monitors the voltage value of the Hall IC inside the torque sensor (electric power steering column sub-assembly) which changes in response to changes in the magnetic flux density (steering torque) detected by the Hall IC, and calculates the assist torque.

While DTC C151162, C151187, C151262 or C151287 is detected, power assist is stopped due to fail-safe operation.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C151162

Power Steering Torque Sensor "A" Signal Compare Failure

Diagnosis Condition: IG ON

Malfunction Status: The difference between 1A and 1B of the TRQ1 output signal is more than a certain value.
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU with motor assembly

EPS warning light: Comes on

Power switch on (IG) again

-

C151187

Power Steering Torque Sensor "A" Missing Message

Diagnosis Condition: IG ON

Malfunction Status: When the battery voltage is 9.0 V or more, the TRQ1 signal is not detected, breaks communication protocol, has a CRC error, or has an invalid rolling counter.
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU with motor assembly

EPS warning light: Comes on

Power switch on (IG) again

-

C151262

Power Steering Torque Sensor "B" Signal Compare Failure

Diagnosis Condition: IG ON

Malfunction Status: The difference between 2A and 2B of the TRQ2 output signal is more than a certain value.
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU with motor assembly

EPS warning light: Comes on

Power switch on (IG) again

-

C151287

Power Steering Torque Sensor "B" Missing Message

Diagnosis Condition: IG ON

Malfunction Status: When the battery voltage is 9.0 V or more, the TRQ2 signal is not detected, breaks communication protocol, has a CRC error, or has an invalid rolling counter.
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU with motor assembly

EPS warning light: Comes on

Power switch on (IG) again

-

CAUTION / NOTICE / HINT

NOTICE:

  • When the electric power steering column sub-assembly has been replaced, perform Power Steering 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

  • When the power steering ECU with motor assembly has been replaced, perform Power Steering 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.

REPLACE POWER STEERING ECU WITH MOTOR ASSEMBLY AND ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

(a) Replace the power steering ECU with motor assembly.

Click here 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

(b) Replace the electric power steering column sub-assembly.

Click here 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

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