Code No.C1505: Steering Wheel Sensor (Signal Seizure or Abnormal Neutral Point)
Code No.C1506: Steering Wheel Sensor (Steering Wheel Sensor Malfunction)


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • The steering wheel sensor-related diagnosis code may be set when diagnosis code No.C1506 is set. Diagnose the steering wheel sensor first when the steering wheel sensor-related diagnosis code is set.

OPERATION
The steering wheel sensor detects a steering wheel angle and sends it to ASTC-ECU via the CAN bus line.

DIAGNOSIS CODE SET CONDITION
These diagnosis codes are set in the following cases:
Code No.C1505
  • The power supply voltage of ASTC-ECU is normal, but when the vehicle is driving at the speed of 20 to 65 km/h, the G and yaw rate sensor outputs the signal of cornering and the steering wheel sensor does not change the output.
  • The power supply voltage of ASTC-ECU is normal, but when the vehicle is driving straight at the speed of 35 km/h or more, the output of the steering wheel sensor indicates a turning state.
Code No.C1506
  • The power supply voltage of ASTC-ECU is normal, but the steering wheel sensor is abnormal.

PROBABLE CAUSES
The most likely causes for these diagnosis codes to set are:

  • Malfunction of steering wheel sensor
  • Damaged wiring harness or connector
  • Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - CAN Bus Diagnostics Table ). Then go to Step 2.

STEP 2. Check whether the diagnosis code is reset.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1505 or C1506 set?
Replace the steering wheel sensor (Refer to ). Then go to Step 4.
The procedure is complete.

STEP 3. Check whether the diagnosis code is reset.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1505 or C1506 set?
Replace the hydraulic unit (integrated with ASTC-ECU) (Refer to ). Then go to Step 4.
The procedure is complete.

STEP 4. Check whether the diagnosis code is reset.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.No.C1505 or C1506 set?
Go to Step 3.
The procedure is complete.