Toyota Yaris: Power Steering System / Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold (C151A17)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / 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.

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 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 (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.

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

(a) Disconnect the z7 power steering ECU 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

OK

2.

INSPECT POWER STEERING ECU 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)

Ignition switch ON

4.5 to 5.5 V

*a

Component with harness connected

(Power Steering ECU Assembly)

OK

REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

NG

REPLACE POWER STEERING ECU ASSEMBLY

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