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 the serial communication, the ECU will store DTC C1595/55.

DTC Code 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

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

  • Steering angle sensor

  • Steering control ECU

  • Wire 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

A001BCCE05
*1 Steering Control ECU
*2 Steering Angle Sensor

CAUTION / NOTICE / HINT

Note

When replacing the steering angle sensor, confirm that the replacement part is of the correct specification.

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


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

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

    B

    GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) 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 specifications is installed.

    NG

    REPLACE STEERING ANGLE SENSOR Click here

    OK

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

    A001AMME03
    *1 Rear view of wire harness connector: (to Steering Control ECU)
    *2 Rear view of wire harness connector: (to Steering Angle Sensor)

    1. Disconnect the A41 steering control ECU connector.

    2. Disconnect the L21 steering angle sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A41-10 (SS1-) - L21-7 (SS1-) Always Below 1 Ω
      A41-19 (SS1+) - L21-8 (SS1+) Always Below 1 Ω
      A41-19 (SS1+) - Body ground Always 10 kΩ or higher
      A41-10 (SS1-) - Body ground Always 10 kΩ or higher
      A41-19 (SS1+) - A41-10 (SS1-) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK STEERING ANGLE SENSOR


    1. A001CZ8E03
      *1 Rear view of wire harness connector: (to Steering Control ECU)

      Disconnect the A41 steering control ECU connector.

      Tech Tips

      The resistance must be measured after the steering angle sensor connector is connected.

    2. Adjust the shift lever to neutral.

    3. Jack up the vehicle.

    4. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition

      A41-19 (SS1+) -

      A41-10 (SS1-)

      		 Engine switch on (IG), rotate steering wheel 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.


    OK

    REPLACE STEERING CONTROL ECU Click here

    NG

    REPLACE STEERING ANGLE SENSOR Click here