Code No. C2257: ASTC Signal Failure 1
Code No. C2258: ASTC Signal Failure 2
Code No. C2259: ASTC Signal Failure 3
Code No. C2260: ASTC Signal Failure 4
Code No. C2261: ASTC Signal Failure 5


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 ).

OPERATION


ACC/FCM-ECU communicates with the ASTC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITION


If the ACC/FCM-ECU receives an abnormal signal or no signals from the ASTC-ECU, it will set the diagnosis code.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Use M.U.T.-III to confirm a diagnosis code of other systems.
Check if the diagnosis code is set in the ASTC-ECU (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>, Diagnosis Function).

Q. Is the diagnosis code set?
Troubleshoot the ASTC-ECU diagnosis code (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>, Diagnosis Code Chart ).
Go to Step 3.

STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the ACC/FCM-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Start the engine.
(4)Press the ACC ON/OFF switch to turn the ACC system to ON.
(5)On completion, check that the diagnosis code is set again.

Q. Is diagnosis code No. C2257, C2258, C2259, C2260 or C2261 set?
Replace the ACC/FCM-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction).