Lexus NX: Torque Sensor1 (C1511-C1514,C1517)

DESCRIPTION

The torque sensor converts the steering wheel rotation torque 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

On

Power switch on (IG) again

-

C1512

Torque Sensor2

Torque sensor malfunction

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

On

Power switch on (IG) again

-

C1513

Torque Sensor Deviation Excessive

Torque sensor malfunction

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

On

Power switch on (IG) again

-

C1514

Torque Sensor Power Supply Voltage

Torque sensor malfunction

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

On

Power switch on (IG) again

-

C1517

Torque Hold

Torque sensor malfunction

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

On

Power 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 power switch 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

Switch Condition

Specified Condition

z11-8 (TRQV) - z11-2 (TRQG)

Power 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) Turn the power switch on (READY).

*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

z11-9 (TRQ1) - z11-2 (TRQG)

Power switch on (READY), steering wheel not being turned (without load)

2.3 to 2.7 V

Power switch on (READY), steering wheel being turned to the right with vehicle stopped

2.5 to 3.8 V

Power switch on (READY), steering wheel being turned to the left with vehicle stopped

1.2 to 2.5 V

z11-1 (TRQ2) - z11-2 (TRQG)

Power switch on (READY), steering wheel not being turned (without load)

2.3 to 2.7 V

Power switch on (READY), steering wheel being turned to the right with vehicle stopped

1.2 to 2.5 V

Power switch on (READY), steering wheel being turned to the left with vehicle stopped

2.5 to 3.8 V

(c) Under each condition, measure the voltage according to the value(s) in the table below, and calculate the sum.

Standard Voltage:

Tester Connection

Condition

Specified Condition

Sum of voltage between z11-9 (TRQ1) and z11-2 (TRQG) and voltage between z11-1 (TRQ2) and z11-2 (TRQG)

Power switch on (READY), steering wheel not being turned (without load)

Between 4.75 V and 5.25 V

Power switch on (READY), steering wheel being turned to the right with vehicle stopped

Power switch on (READY), steering wheel being turned to the left with vehicle stopped

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

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