Code No.C1555:
Output error in steering wheel sensor
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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 Diagnosis Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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The steering wheel sensor output signal is sent to TCL/ASC-ECU via the special
CAN bus lines.
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DIAGNOSIS CODE SET CONDITIONS
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When an abnormality (larger than the actual maximum steering angle) is detected in the
steering angle, the diagnosis is set.
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- Malfunction of the steering wheel sensor
- Steering wheel sensor improper installation
- Steering wheel sensor calibration error
- Malfunction of TCL/ASC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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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 lines. (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 the diagnosis code No.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 .)
Then go to Step 4.
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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 shows the deviation within ±5° from
the neutral position.(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 5.
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Perform calibration of steering wheel sensor. (Refer to .)
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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.11: 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, perform the steering wheel sensor
calibration.(Refer to .)
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STEP 6. Diagnosis code recheck
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is the diagnosis code No.C1555 set?
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Replace the hydraulic unit (integrated with TCL/ASC-ECU) (Refer to ).
Then go to Step 7.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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STEP 7. Diagnosis code recheck
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is the diagnosis code No.C1555 set?
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Return to Step 1.
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This diagnosis is complete.
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