Code No. C1505: Steering angle sensor (signal seizure or abnormal neutral point)
Code No. C1506: Steering angle sensor error (steering wheel sensor malfunction)
Code No. C1555: Steering angle SNS.out of range


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the steering wheel sensor is replaced, always carry out calibration to make ASTC-ECU learn the neutral point (Refer to ).
  • When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).

OPERATION


The steering wheel sensor output signal is sent to ASTC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No. C1505, C1506 or C1555 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Steering wheel sensor installation state check
Check that the column switch assembly (Integrated with steering wheel sensor) is installed correctly (Refer to GROUP 54A - Column Switch .).

Q. Is the check result normal?
Go to Step 4.
Install the column switch assembly (Integrated with steering wheel sensor) correctly (Refer to GROUP 54A - Column Switch ).

STEP 4. M.U.T.-III data list
With the front wheel facing in the straight-ahead direction, check the steering wheel sensor signal using the data list. Check that the data list deviates within ±5° from the neutral position (Refer to ).

  • Item No.07: Steering angle

Q. Is the check result normal?
Go to Step 5.
Calibrate the steering wheel sensor (Refer to ).

STEP 5. M.U.T.-III data list
Turn the steering wheel fully to the left, and then turn it fully to the right. Then check that the value of the steering wheel sensor changes smoothly using the data list. In addition, check that the steering wheel angle on the data list almost matches the actual steering wheel angle (Refer to ).

  • Item No.07: Steering angle

Q. Is the check result normal?
Go to Step 6.
Replace the column switch assembly (Integrated with steering wheel sensor) (Refer to GROUP 54A - Column Switch ), calibrate the steering wheel sensor (Refer to ).

STEP 6. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set.
(1)Erase the set diagnosis code.
(2)Ignition switch: "LOCK" (OFF)
(3)Ignition switch: "ON"

Q. Is diagnosis code No. C1505, C1506 or C1555 set?
Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).