POWER STEERING SYSTEM, Diagnostic DTC:C1511,C1512,C1513 and C1514

DTC Code DTC Name
C1511 Torque Sensor Circuit Malfunction
C1512 Torque Sensor Circuit Malfunction
C1513 Torque Sensor Circuit Malfunction
C1514 Torque Sensor Power Supply Abnormal

DESCRIPTION

The torque sensor converts the rotation torque input to the steering wheel into an electrical signal and sends it to the power steering ECU. Based on this signal, the ECU detects steering effort.

DTC Code

DTC Detection Condition

Trouble Area

C1511

A torque sensor (TRQ1) signal error or stop.

  • Steering column assembly (torque sensor)

  • Power steering ECU assembly

C1512

A torque sensor (TRQ2) signal error or stop.

C1513

The deviation between torque sensor TRQ1 and TRQ2 exceeds a specified value.

C1514

A torque sensor power supply voltage error.

WIRING DIAGRAM

C206012E01

CAUTION / NOTICE / HINT

Note:

If the power steering ECU assembly is replaced, perform the assist map writing (Click here).

PROCEDURE

  1. CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - POWER STEERING ECU)

    1. U123033E02

      Check the connection condition of the z18 torque sensor connector.

      OK

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

      Table 1. Text in Illustration

      *1

      Component with harness connected

      (Power Steering ECU)

    CONNECT CONNECTOR SECURELY

  2. CHECK POWER STEERING ECU ASSEMBLY

    1. Turn the ignition switch off.

    2. Turn the ignition switch to ON.

    3. U123035E02

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      z18-3 (TRQV) - z18-1 (TRQG)

      Ignition switch ON

      8.5 to 11 V

      z18-5 (TRQF) - z18-1 (TRQG)

      Ignition switch ON

      3.28 to 3.32 V
      Table 2. Text in Illustration

      *1

      Component with harness connected

      (Power Steering ECU)

    REPLACE POWER STEERING ECU ASSEMBLY

    (Click here)

  3. CHECK STEERING COLUMN ASSEMBLY

    1. Turn the ignition switch off.

    2. Turn the ignition switch to ON.

    3. U123036E02

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      z18-7 (TRQ1) - z18-1 (TRQG)

      Engine running, steering wheel not turned (without load)

      2.3 to 2.7 V

      Engine running, steering wheel turned to right with vehicle stopped

      2.5 to 4.04 V

      Engine running, steering wheel turned to left with vehicle stopped

      0.95 to 2.5 V

      z18-2 (TRQ2) - z18-1 (TRQG)

      Engine running, steering wheel not turned (without load)

      2.3 to 2.7 V

      Engine running, steering wheel turned to right with vehicle stopped

      0.95 to 2.5 V

      Engine running, steering wheel turned to left with vehicle stopped

      2.5 to 4.04 V

    4. Add the voltage measured at terminal TRQ1 minus 2.5 V to the voltage measured at terminal TRQ2 minus 2.5 V.

      OK

      Below 0.25 V (Absolute value)

      Table 3. Text in Illustration

      *1

      Component with harness connected

      (Power Steering ECU)

    REPLACE POWER STEERING ECU ASSEMBLY

    (Click here)

    REPLACE STEERING COLUMN ASSEMBLY

    (Click here)