VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C1595, C15C4

DTC Code DTC Name
C1595 Lost Communication with Steering Angle Sensor Module(SIL)
C15C4 Steering Signal Not Detected

DESCRIPTION

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

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

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1595 Lost Communication with Steering Angle Sensor Module(SIL) With the engine switch (IG) and a power source voltage of 10 V or higher, serial communication from the steering sensor is interrupted for 3 seconds or more.

  • Steering sensor

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
C15C4 Steering Signal Not Detected The system enters test mode.

  • Steering sensor

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 - -

WIRING DIAGRAM

B006E4PE01
*a Steering Sensor
*b VGRS ECU (Front Steering Control ECU)

CAUTION / NOTICE / HINT

Note

When replacing the VGRS ECU (front 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


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTCs C15C1, C15C2 and U0126 are not output A
      DTCs C15C1, C15C2 and U0126 are output B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

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


    1. Turn the engine switch off.

    2. Disconnect the G79 VGRS ECU (front steering control ECU) connector.

    3. Disconnect the G29 steering sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G79-5 (SS1-) - G29-10 (SS2-) Always Below 1 Ω
      G79-6 (SS1+) - G29-5 (SS2+) Always Below 1 Ω
      G79-5 (SS1-) or G29-10 (SS2-) - Body ground Always 100 kΩ or higher
      G79-6 (SS1+) or G29-5 (SS2+) - Body ground Always 100 kΩ or higher
      G79-5 (SS1-) - G79-6 (SS1+) Always 1000 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STEERING SENSOR


    1. B006EEGC66
      *a

      Component with harness connected

      (VGRS ECU [Front Steering Control ECU])

      Reconnect the G79 VGRS ECU (front steering control ECU) connector.

    2. Reconnect the G29 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 (front steering control ECU), measure the voltage from the rear of the connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G79-5 (SS1-) - Body ground Steering wheel rotated slowly Pulse waveform that alternates between 0 and 5 V is output
      G79-6 (SS1+) - Body ground
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    NG

    REPLACE STEERING SENSOR Click here