Code No.C1555:
Steering wheel sensor out of range
OPERATION
The steering wheel sensor output signal is sent to the ABS/Active stability control
system-ECU via the private CAN bus line.
DIAGNOSIS CODE SET CONDITIONS
If the system detects an abnormal steering angle (bigger than actual maximum steering
angle), it will set the diagnosis code.
PROBABLE CAUSES
- Malfunction of the steering wheel sensor
- Malfunction of the steering wheel sensor installation
- Malfunction of the steering wheel sensor calibration
- Malfunction of the hydraulic unit (integrated with ABS/Active stability
control system-ECU)
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STEP 1. M.U.T.-III data list
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Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
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Use the Data List to check the steering wheel sensor signal with the steering wheel at
straight-forward position. Check whether the Data List shows deviation of within ± 5° from
the neutral position. Refer to  .
- Item No.11: Steering angle
Q.
Is the check result normal?
 Go to Step 2.
 Perform the steering wheel sensor calibration again (Refer to ).
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STEP 2. M.U.T.-III data list
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When the steering wheel is turned to left then right full lock, the steering wheel sensor
value shown on the Data List should correspond to the actual steering angle. Refer to .
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- Item No.11: Steering angle
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the installation condition of the steering wheel sensor.
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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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Correct the installation condition.
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STEP 4. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Turn the steering wheel lock-to-lock.
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(6)Check if the diagnosis code is set.
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(7)Turn the ignition switch to the "LOCK" (OFF) position.
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(8)Disconnect M.U.T.-III.
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Replace the hydraulic unit (integrated with ABS/Active stability control
system-ECU). Then perform the variant coding and write the VIN data (Refer to GROUP 00, Precautions
Before Service - How to Perform Variant Coding ).
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
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