Code No. C2271
SAS signal fail
| caution |
- Whenever the ECU is replaced, ensure
that the CAN bus lines are normal.
- When the steering wheel sensor is replaced, calibrate the steering wheel sensor.
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OPERATION
FCM/LDW/AHB-ECU communicates with the steering wheel sensor via the
CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality below is detected:
- The ECU receives an invalid steering wheel angle signal from the steering
wheel sensor.
PROBABLE CAUSES
- Malfunction of the steering wheel sensor (column switch assembly)
- Malfunction of the FCM/LDW/AHB-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check whether the steering wheel sensor is installed
properly.
Q.
Is the check result normal?
Go to Step 2
Install the steering wheel sensor properly.
STEP 2. M.U.T.-III data list.
Check the input signal.
- Vehicle stopped (the steering wheel is in the neutral position)
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Item No.
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Item name
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Normal condition
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17
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Steering wheel angle
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-6 to 6 deg
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Item No.
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Item name
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Normal condition
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17
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Steering wheel angle
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Nearly the same as the steering wheel operation angle (-750 to 750
deg)
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OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 3
Replace the steering wheel sensor (column switch assembly) (Refer to GROUP 54A - Column
Switch 
).
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).