POWER STEERING SYSTEM, Diagnostic DTC:C1514

DTC Code DTC Name
C1514 Torque Sensor Power Supply Voltage

DESCRIPTION

The power steering ECU assembly supplies a voltage of 5 V to the torque sensor (steering column sub-assembly) and monitors the voltage value of the Hall IC inside the torque sensor (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 C1514 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
C1514 Torque Sensor Power Supply Voltage

Diagnosis Condition: IG ON

Malfunction Status: TRQV voltage is less than 4.5 V or more than 5.5 V.

  • Torque sensor (Steering column sub-assembly)

  • Power steering ECU assembly

 EPS warning light: Comes on Ignition switch ON again

WIRING DIAGRAM

B0045L5E05
*a Torque Sensor (Steering Column Sub-assembly)
*b Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note


  • If the 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. INSPECT TORQUE SENSOR (STEERING COLUMN SUB-ASSEMBLY) (CHECK FOR SHORT)


    1. Disconnect the z6 power steering ECU assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      z6-8 (TRQV) - Body ground Always 10 kΩ or higher
      z6-8 (TRQV) - z6-2 (TRQG) Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE STEERING COLUMN SUB-ASSEMBLY Click here

    C

    REPLACE STEERING COLUMN SUB-ASSEMBLY Click here

    A

  2. INSPECT POWER STEERING ECU ASSEMBLY (POWER SOURCE OF TORQUE SENSOR)


    1. Start the engine.

    2. B0047CZC17
      *a

      Component with harness connected

      (Power Steering ECU Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z6-8 (TRQV) - z6-2 (TRQ6) Engine start 4.5 to 5.5 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (for LHD) C
      NG (for RHD) D

    A

    REPLACE STEERING COLUMN SUB-ASSEMBLY Click here

    B

    REPLACE STEERING COLUMN SUB-ASSEMBLY Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    D

    REPLACE POWER STEERING ECU ASSEMBLY Click here