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DTC B254A: Steering angle sensor fault
 
 
 
 
TROUBLE JUDGMENT
When the camera-ECU receives any of the following unfeasible values from the steering wheel sensor, DTC B254A will be set:
  • The steering wheel sensor cannot recognize any steering wheel angle for at least 2.5 seconds.
  • The ECU receives the signal, which informs of an internal malfunction or incomplete initialization, from the steering wheel sensor for at least 2.5 seconds.
note"thunder" mark is displayed on the vehicle icon when DTC B254A is set.
 
 
TROUBLESHOOTING HINTS
  • The steering wheel sensor (column switch assembly) may be defective
  • The steering wheel sensor has not learned the neutral point of the steering wheel.
  • The camera-ECU may be defective
  • Damaged harness wires and connectors
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ).
 
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 )
Has the calibration been completed successfully?
Go to Step 3.
Replace the steering wheel sensor (column switch assembly).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check data list.
Using the camera-ECU service data, check the steering wheel status.
 
Item No.Scan tool (M.U.T.-IIISE) displayCheck conditionNormal condition
7Steering wheel angleVehicle stopped (the steering wheel is in the neutral position)-6 to 6 deg
RunningNearly the same as the steering wheel operation angle <-720 to 720 deg>
Is the check result normal?
Go to Step 4.
Replace the steering wheel sensor (column switch assembly).
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the camera-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check the DTC.
Is the DTC set?
Replace the camera-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 ).