Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H79Q
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2019]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Sedan)): C151A17; Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold; 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]

DTC

C151A17

Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold

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 C151A17 is detected, power assist is stopped or assist amount is limited due to fail-safe operation.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C151A17

Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold

TRQV1 voltage is 5.6 V or more
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU with motor assembly

EPS warning light: Comes on

Ignition switch ON again

-

WIRING DIAGRAM

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 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Sedan)): 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 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Sedan)): CALIBRATION

PROCEDURE

1.

INSPECT TORQUE SENSOR (ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY) (CHECK FOR SHORT)

(a) Disconnect the z7 power steering ECU with motor assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

z7-7 (TRQV1) - Body ground

Always

10 kΩ or higher

z7-7 (TRQV1) - z7-8 (TRQG1)

Always

10 kΩ or higher
NG

REPLACE 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

OK

2.

INSPECT POWER STEERING ECU WITH MOTOR ASSEMBLY (POWER SOURCE OF TORQUE SENSOR)

(a) Start the engine.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

z7-7 (TRQV1) - z7-8 (TRQG1)

Engine running

4.5 to 5.5 V

*a

Component with harness connected

(Power Steering ECU with Motor Assembly)
OK

REPLACE 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

NG

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