Code No.B1A28 Engine-ECU authenticate error


caution
  • When the diagnosis code No. B1A28 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSIS FUNCTION



JUDGMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of KOS-ECU
  • Malfunction of engine-ECU
  • Chassis number registered in engine-ECU unmatched

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





STEP 2. M.U.T.-III other system diagnosis code



Q. Is the diagnosis code set?





STEP 3. Check the chassis number registered in the engine-ECU and the vehicle’s chassis number.



(1)Select "MPI/GDI/DIESEL" on the system selection screen of the M.U.T.-III.
(2)Select "Coding."
(3)Select "Chassis No. Information."
(4)Compare it with the chassis number of the vehicle.

Q. Do chassis number registered in the engine-ECU and the vehicle’s chassis number match?





STEP 4. Check whether the diagnosis code is reset.



(1)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?





STEP 5. Check whether the diagnosis code is reset.



(1)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?





STEP 6. Check whether the diagnosis code is reset.



(1)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?