Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Torque Sensor1 (C1511-C1514,C1517)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Suspension / Power Assist Systems / Power Steering System / Torque Sensor1 (C1511-C1514,C1517)

DESCRIPTION

The torque sensor converts the rotational torque received from the steering wheel into electric signals and sends them to the power steering ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C1511

Torque Sensor1

Torque sensor malfunction
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU assembly

EPS warning light: Comes on

The ECU judges the system has returned to normal or the power switch is turned on (IG) again

-

C1512

Torque Sensor2

Torque sensor malfunction
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU assembly

EPS warning light: Comes on

The ECU judges the system has returned to normal or the power switch is turned on (IG) again

-

C1513

Torque Sensor Deviation Excessive

Torque sensor malfunction
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU assembly

EPS warning light: Comes on

The ECU judges the system has returned to normal or the power switch is turned on (IG) again

-

C1514

Torque Sensor Power Supply Voltage

Torque sensor malfunction
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU assembly

EPS warning light: Comes on

Engine switch on (IG) again

-

C1517

Torque Hold

Torque sensor malfunction
  • Torque sensor (Electric power steering column sub-assembly)
  • Power steering ECU 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 assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

    Click here

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION

(a) Check the connection condition of the torque sensor connector.

OK:

Torque sensor connector is securely connected to the power steering ECU assembly.

NG

CONNECT CONNECTOR
OK

2.

CHECK POWER STEERING ECU ASSEMBLY (TRQV VOLTAGE)

(a) Turn the engine switch to on (IG).

*a

Component with harness connected

(Power Steering ECU Assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z8-7 (TRQV1) - z8-8 (TRQG1)

Engine switch on (IG)

4.5 to 5.5 V

z8-3 (TRQV2) - z8-2 (TRQG2)

Engine switch on (IG)

4.5 to 5.5 V
NG

REPLACE POWER STEERING ECU ASSEMBLY

OK

3.

CHECK POWER STEERING ECU ASSEMBLY (TRQ1, TRQ2 VOLTAGE)

(a) Start the engine.

*a

Component with harness connected

(Power Steering ECU Assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z8-9 (TRQ1) - z8-8 (TRQG1)

Engine running and steering wheel not being turned (without load)

2.3 to 2.7 V

Engine running and steering wheel being turned to the right with vehicle stopped

2.5 to 3.8 V

Engine running and steering wheel being turned to the left with vehicle stopped

1.2 to 2.5 V

z8-1 (TRQ2) - z8-2 (TRQG2)

Engine running and steering wheel not being turned (without load)

2.3 to 2.7 V

Engine running and steering wheel being turned to the right with vehicle stopped

1.2 to 2.5 V

Engine running and steering wheel being turned to the left with vehicle stopped

2.5 to 3.8 V

(c) Under each condition, measure the voltage at terminals TRQ1 and TRQ2, and calculate the sum.

Standard Voltage:

Tester Connection

Condition

Specified Condition

Sum of voltage between z8-9 (TRQ1) and z8-8 (TRQG1) and voltage between z8-1 (TRQ2) and z8-2 (TRQG2)

Engine running and steering wheel not being turned (without load)

Between 4.75 V and 5.25 V

Engine running and steering wheel being turned to the right with vehicle stopped

Engine running and steering wheel being turned to the left with vehicle stopped
OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

    Power Steering System
    ...

    Torque Sensor Zero Point Adjustment Undone (C1515)
    DESCRIPTION This DTC does not indicate a malfunction. The power steering ECU assembly stores this DTC when it determines that torque sensor zero point calibration has not been performed. DTC No. ...

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