Code No.B1A28 Engine-ECU authentification 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



JUDGEMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of WCM
  • Engine-ECU malfunction
  • 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. Diagnosis code check


Q. Other than code No. B1A28, is diagnosis code No. B1761 or B2206 set?





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?