Code No.B254A
Steering angle sensor fault
TROUBLE JUDGEMENT
When the camera-ECU receives any of the following unfeasible values from the steering
wheel sensor, diagnosis code No.B254A will be set:
- The steering wheel sensor cannot recognise any steering wheel angle for at
least 2.5 seconds.
- The ECU receives the signal, which informs of an internal malfunction or incomplete
initialisation, from the steering wheel sensor for at least 2.5 seconds.
| note |
"thunder" mark is displayed on the vehicle icon when diagnosis code No.B254A is set.
|
PROBABLE CAUSES
- Malfunction of steering wheel sensor (column switch assembly)
- The steering wheel sensor has not learned the neutral point of the steering wheel.
- Malfunction of camera-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting).
STEP 2. Check the steering wheel sensor.
Calibrate the steering wheel sensor (teach-in a neutral position). (Refer to GROUP 35C - Steering wheel
sensor calibration.)
Q.
Has the calibration been completed successfully?
Go to Step 3.
Replace the steering wheel sensor (column switch assembly) (Refer to 
).
STEP 3. M.U.T.-III data list.
Using the camera-ECU service data, check the steering wheel status.
|
|
Item No.
|
M.U.T.-III display
|
Check condition
|
Normal condition
|
7
|
Steering wheel angle
|
Vehicle stopped (the steering wheel is in the neutral position)
|
-6 to 6 °
|
Running
|
Nearly the same as the steering wheel operation angle <-720 to
720 deg>
|
|
Q.
Is the check result normal?
Go to Step 4.
Replace the steering wheel sensor (column switch assembly). Then go to Step 4
.
STEP 4. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the camera-ECU.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
|
|
|
(3)Check if diagnosis code is set.
|
Q.
Is the diagnosis code set?
Replace the camera-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction).