POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Hatchback)): C1512; Torque Sensor2; 2019 - 2020 MY Corolla Corolla Hatchback GR Corolla [06/2018

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001C0X0
Model Year Start: 2019	Model: GR Corolla	Prod Date Range: [06/2018 - 09/2019]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Hatchback)): C1512; Torque Sensor2; 2019 - 2020 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2019]

DTC

C1512

Torque Sensor2

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 C1512 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

C1512

Torque Sensor2

Diagnosis Condition: IG ON

Malfunction Status: TRQ2 voltage is less than 0.66 V or more than 4.6 V

Torque sensor (Electric power steering column sub-assembly)
Power steering ECU with motor assembly

EPS warning light: Comes on

Engine switch on (IG) again

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the electric power steering column sub-assembly has been replaced, perform torque sensor zero point calibration.
Click here
If the power steering ECU with motor assembly has been replaced, perform torque sensor zero point calibration.
Click here

PROCEDURE

1.	CHECK POWER STEERING ECU WITH MOTOR ASSEMBLY (TRQ2 VOLTAGE)

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

*a	Component without harness connected (Torque Sensor (Electric Power Steering Column Sub-assembly))

(b) Connect 3 new 1.5 V batteries in series to prepare a 4.5 V power supply.

HINT:

Check that the voltage of the prepared power supply is 4.5 V.

Standard Voltage:

Tester Connection	Condition	Specified Condition
z7-1 (TRQ2) - z7-2 (TRQG2)	Connect the 4.5 V positive (+) terminal to z7-3 (TRQV2) and 4.5 V negative (-) terminal to z7-2 (TRQG2) Steering wheel not being turned (without load)	2.07 to 2.43 V
	Connect the 4.5 V positive (+) terminal to z7-3 (TRQV2) and 4.5 V negative (-) terminal to z7-2 (TRQG2) Steering wheel being turned to right with vehicle stopped	1.08 to 2.25 V
	Connect the 4.5 V positive (+) terminal to z7-3 (TRQV2) and 4.5 V negative (-) terminal to z7-2 (TRQG2) Steering wheel being turned to left with vehicle stopped	2.25 to 3.42 V

NOTICE:

To avoid damaging the torque sensor (electric power steering column sub-assembly), do not apply a voltage of more than 5 V.

HINT:

The voltage values specified above are applicable when using an applied voltage of 4.5 V, and vary depending on the applied voltage (When compared to values for an applied voltage of 5 V, these values differ by a factor of 0.9).

When using an applied voltage of 5 V, the specified values are as follows.

Condition	Specified Condition
Steering wheel not being turned (without load)	2.3 to 2.7 V
Steering wheel being turned to right with vehicle stopped	1.2 to 2.5 V
Steering wheel being turned to left with vehicle stopped	2.5 to 3.8 V

REPLACE POWER STEERING ECU WITH MOTOR ASSEMBLY

REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY