Toyota Yaris: Power Steering System / Power Steering Torque Sensor "A" Signal Compare Failure (C151162,C151187,C151262,C151287)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / Power Steering Torque Sensor "A" Signal Compare Failure (C151162,C151187,C151262,C151287)

DESCRIPTION

The power steering ECU 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 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
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 assembly	EPS warning light: Comes on	Ignition switch ON 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 assembly	EPS warning light: Comes on	Ignition switch ON 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 assembly	EPS warning light: Comes on	Ignition switch ON 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 assembly	EPS warning light: Comes on	Ignition switch ON again	-

CAUTION / NOTICE / HINT

NOTICE:

When the electric power steering column sub-assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).
Click here
When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).
Click here

PROCEDURE

1.	REPLACE POWER STEERING ECU ASSEMBLY AND ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

(a) Replace the power steering ECU assembly.

Click here

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

Click here

END

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Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold (C151A17)

DESCRIPTION The power steering ECU 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...

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