Code No. C2256:
Brake Switch Signal Fail
Code No. C2276: Brake Switch Signal
caution |
- 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 -
Troubleshooting
).
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- When the ACC/FCM-ECU is replaced, calibrate the radar (refer to
).
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OPERATION
The ACC/FCM-ECU receives stop lamp switch signal from the ETACS-ECU.
DIAGNOSIS CODE SET CONDITION
The ACC/FCM-ECU sets the diagnosis code when it receives an abnormal stop lamp
switch signal from the ETACS-ECU.
note |
Diagnosis code No. C2276 is not set as a historic fault.
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PROBABLE CAUSES
- Malfunction of the CAN bus line
- ETACS system fault (stop lamp switch)
- Malfunction of the ACC/FCM-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to perform the CAN bus diagnosis.
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Q.
Is the check result normal?
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Go to Step 2.
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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. M.U.T.-III data list for other system.
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Check the ETACS-ECU system data list (Refer to GROUP 54A -
ETACS, Troubleshooting,
Service Data Reference Table).
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- Item No. 108: Stop lamp switch
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Q.
Is the check result normal?
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Go to Step 3.
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Troubleshoot the ETACS-ECU (Refer to GROUP 54A -
ETACS, Troubleshooting,
Input Signal Procedures, Inspection Procedure 10). Then go to Step 3.
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STEP 3. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the ACC/FCM-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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(4)Press the ACC ON/OFF switch to turn the ACC system to ON.
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(5)Depress the brake pedal several times.
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(6)On completion, check that the diagnosis code is set again.
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Q.
Is diagnosis code No. C2256 or C2276 set?
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Replace the ACC/FCM-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction).
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