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
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- 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 - CAN Bus Diagnostics Table
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- 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
ASC-ECU learn the neutral point (Refer to ).
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the G and yaw rate sensor and the steering wheel sensor (Refer to and ).
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OPERATION
The steering wheel sensor output signal is sent to ASC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
- When an abnormal signal is output from the steering wheel sensor, the ASC-ECU
determines that the trouble occurs and sets the diagnosis code.
- When an abnormality (larger than the actual maximum steering angle) is detected in
the steering angle, the diagnosis code is set.
PROBABLE CAUSES
- The CAN bus line is defective.
- Steering wheel sensor improper installation
- Steering wheel sensor calibration error
- Malfunction of the steering wheel sensor
- Malfunction of the hydraulic unit assembly (integrated with ASC-ECU)
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STEP 1. M.U.T.-III CAN bus diagnosis.
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines.
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Q.
Is diagnosis code No. C1505, C1506 or C1555 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Steering wheel sensor installation state check.
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Check that the steering wheel sensor is installed correctly.
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Q.
Is the check result normal?
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Go to Step 4.
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Install the steering wheel sensor correctly. (Refer to ),
calibrate the steering wheel sensor. (Refer to ). Then go to
Step 7.
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STEP 4. M.U.T.-III data list.
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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 ).
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- Item No.07: Steering angle
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Q.
Is the check result normal?
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Go to Step 5.
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Calibrate the steering wheel sensor (Refer to ).
Then go to Step 7.
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STEP 5. M.U.T.-III data list.
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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 ).
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- Item No.07: Steering angle
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Q.
Is the check result normal?
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Go to Step 6.
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After the steering wheel sensor is replaced (Refer to ),
calibrate the steering wheel sensor.(Refer to ). Then go to
Step 7.
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STEP 6. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. C1505, C1506 or C1555 set?
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Replace the hydraulic unit assembly (integrated with ASC-ECU) (Refer to ).
Then go to Step 7.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction).
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STEP 7. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. C1505, C1506 or C1555 set?
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Return to Step 3.
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This diagnosis is complete.
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