Code No. U0317 EPB CAN timeout
Code No. U15A5 FCM/LDW/AHB CAN timeout


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 - CAN Bus Diagnostics Table ).
  • If diagnosis codes U0317 and U15A5 are set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASC-ECU cannot receive the signal sent from other ECU for a certain period.

OPERATION
ASC-ECU communicates with the electric parking brake ECU and FCM/LDW/AHB-ECU via the CAN bus lines.

PROBABLE CAUSES
Code No. U0317
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of electric parking brake ECU
  • ASC-ECU malfunction
Code No. U15A5
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of FCM/LDW/AHB-ECU
    note Diagnosis code No.C1752 may be also set in the FCM/LDW/AHB-ECU. When diagnosis code No. C1752 is set, diagnose the FCM/LDW/AHB-ECU (Refer to ).
  • ASC-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use 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 - CAN Bus Diagnostics Table ). On completion, go to Step 4.

STEP 2. Check whether the diagnosis code is set again.

Q. Is Code No. U0317 or U15A5 set?
Go to Step 3.
The procedure is complete.

STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that other diagnosis code is set in the ECU corresponding to the relevant diagnosis.

Q. Is other diagnosis code set?
Troubleshoot for the relevant diagnosis code.
Go to Step 4.

STEP 4. M.U.T.-III diagnosis code
Use M.U.T.-III to check if the same diagnosis code (time-out) is set in the other ECU.

Q. Is any diagnosis code set?
YES (Code No. U0317 is set) : Replace the electric parking brake ECU (Refer to GROUP 36 - Electric Parking Brake ECU ), and then go to Step 5.
YES (Code No. U15A5 is set) : Replace the FCM/LDW/AHB-ECU (Refer to ), and then go to Step 5.
NO (No diagnosis code is set.) : The procedure is complete.

STEP 5. Check whether the diagnosis code is set again.
Erase the diagnosis code.

Q. Is Code No. U0317 or U15A5 set?
Replace the hydraulic unit (integrated with ASC-ECU).
The procedure is complete.