Code No. B1A28 ENG ECU authentification error


caution
  • If the diagnosis code No. B1A28 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA


Check Conditions
  • At engine starting certification
Judgment Criterion
  • Certification result unmatch is received from engine-ECU.

PROBABLE CAUSES



  • Writing error of chassis number to engine-ECU (engine-ECU has been interchanged between two vehicles, or chassis number has not been written after engine-ECU replacement)
  • Malfunction of the CAN bus line
  • Malfunction of OSS-ECU

DIAGNOSIS PROCEDURE


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