VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C1595/55, C15C4/68

DTC Code DTC Name
C1595/55 Lost Communication with Steering Angle Sensor Module
C15C4/68 Steering Angle Signal (Test Mode DTC)

DESCRIPTION

Signal transmission between the VGRS ECU (steering control ECU) and steering sensor is performed via serial communication.

If a serial communication error occurs between the VGRS ECU (steering control ECU) and steering sensor, the ECU stores DTC C1595/55.

The test mode DTC C15C4/68 is only stored during test mode.

DTC No. DTC Detection Condition Trouble Area
C1595/55 With the engine switch on (IG) and a power source voltage of 10 V or more, serial communication from the steering sensor is interrupted for 3 seconds or more.

  • Steering sensor

  • VGRS ECU (steering control ECU)

  • Harness or connector
C15C4/68 The system enters test mode.

  • Steering sensor

  • VGRS ECU (steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A01WWZJE19
*a Steering Sensor
*b VGRS ECU (Steering Control ECU)

CAUTION / NOTICE / HINT

Note

When replacing the VGRS ECU (steering control ECU), perform actuator angle neutral point calibration and initialization after replacement Click here.

PROCEDURE


  1. CHECK DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs C15C1/74, C15C2/74 and U0126/56 are not output A
      DTCs C15C1/74, C15C2/74 and U0126/56 are output B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK HARNESS AND CONNECTOR (VGRS ECU (STEERING CONTROL ECU) - STEERING SENSOR)


    1. Turn the engine switch off.

    2. Disconnect the E129 VGRS ECU (steering control ECU) connector.

    3. Disconnect the E131 steering sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E129-5 (SS1-) - E131-9 (SS2-) Always Below 1 Ω
      E129-6 (SS1+) - E131-8 (SS2+) Always Below 1 Ω
      E129-5 (SS1-) or E131-9 (SS2-) - Body ground Always 100 kΩ or higher
      E129-6 (SS1+) or E131-8 (SS2+) - Body ground Always 100 kΩ or higher
      E129-5 (SS1-) - E129-6 (SS1+) Always 1000 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STEERING SENSOR


    1. A01WV2LE02
      Text in Illustration
      *a

      Component with harness connected

      (VGRS ECU [Steering Control ECU])

      Reconnect the VGRS ECU (steering control ECU) connector.

    2. Reconnect the steering sensor connector.

    3. Start the engine.

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

      Tech Tips

      With the connector connected to the VGRS ECU (steering control ECU), measure the voltage from the rear of the connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E129-5 (SS1-) - E129-6 (SS1+) Steering wheel rotated slowly Pulse waveform that alternates between 0 and 5 V is output
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE VGRS ECU (STEERING CONTROL ECU) Click here

    B

    REPLACE VGRS ECU (STEERING CONTROL ECU) Click here

    C

    REPLACE STEERING SENSOR Click here