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 steering control ECU and steering angle sensor is performed via serial communication.

If an error occurs between them in serial communication, the ECU will store DTC C1595/55.

DTC Code DTC Detection Condition Trouble Area
C1595/55 The steering control ECU detects an error in serial communication between the ECU and steering angle sensor.

  • Steering angle sensor

  • Steering control ECU

  • Harness or connector
C15C4/68 A steering signal indicating a tire angle of 36° or more (to the left or right) is input after entering test mode.*

  • Steering angle sensor

  • Steering control ECU

  • Harness or connector

Tech Tips

*: A tire angle of 36° and a motor rotation angle of 36° correspond to the steering wheel angle. The amount of change in tire angle and motor rotation angle is from when the mode is changed to test mode.

WIRING DIAGRAM

A0157XAE03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs in the CAN communication system (for LHD: Click here, for RHD: Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK STEERING ANGLE SENSOR


    1. Check if a steering angle sensor that complies with the vehicle specifications is installed.

      OK
      A steering angle sensor that complies with the vehicle specification is installed.

    NG

    REPLACE STEERING ANGLE SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (STEERING CONTROL ECU - STEERING ANGLE SENSOR)

    A015DU0E03

    1. Disconnect the E79 steering control ECU connector.

    2. Disconnect the E11 steering angle sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E79-10 (SS1-) - E11-7 (SS1-) Always Below 1 Ω
      E79-19 (SS1+) - E11-8 (SS1+)
      E79-19 (SS1+) - Body ground Always 10 kΩ or higher
      E79-10 (SS1-) - Body ground
      E79-19 (SS1+) - E79-10 (SS1-)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK STEERING ANGLE SENSOR


    1. A015DCOE03

      Disconnect the E79 steering control ECU connector.

    2. Move the shift lever to N.

    3. Jack up the vehicle.

    4. Check the waveform of the steering angle sensor using an oscilloscope.

      Tech Tips

      The voltage must be measured with the steering angle sensor connector connected.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E79-19 (SS1+) - E79-10 (SS1-) Engine switch on (IG), steering wheel rotated slowly

      Pulse generation

      (0 to 5 V)

      Tech Tips

      The output voltage should fluctuate up and down similarly to the diagram when the wheel is turned slowly.

      Result

      Result

      		 Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE STEERING CONTROL ECU Click here

    C

    REPLACE STEERING CONTROL ECU Click here

    A

    REPLACE STEERING ANGLE SENSOR Click here