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

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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
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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.
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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PROCEDURE


  1. Click here

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


    1. A01IQ9FE01

      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)

  2. Click here

    CHECK POWER STEERING ECU ASSEMBLY


    1. Turn the ignition switch off.

    2. Turn the ignition switch to ON.

    3. A01IQ9FE11

      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)

  3. Click here

    CHECK STEERING COLUMN ASSEMBLY


    1. Turn the ignition switch off.

    2. Turn the ignition switch to ON.

    3. A01IQ9FE12

      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)

  4. Click here

    CONNECT CONNECTOR SECURELY

  5. Click here

    REPLACE POWER STEERING ECU ASSEMBLYClick here

  6. Click here

    REPLACE STEERING COLUMN ASSEMBLYClick here

  7. Click here

    REPLACE POWER STEERING ECU ASSEMBLYClick here