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DTC B1A28 ECM authenticate error
 
 
caution
  • If the DTC B1A28 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
When the OSS certification result is different from the engine status after the completion of engine starting permission communication, OSS-ECU determines that a problem has occurred, and sets the DTC B1A28. At the same time, OSS-ECU displays the immobilizer certification system inspection warning screen to the multi information display of the combination meter.
 
 
DTC SET CONDITION
Check Conditions
  • At engine starting certification
Judgment Criterion
  • Certification result unmatch is received from ECM.
 
 
TROUBLESHOOTING HINTS
  • Writing error of VIN to ECM (ECM has been interchanged between two vehicles, or VIN has not been written after ECM replacement)
  • Malfunction of the CAN bus line
  • Malfunction of OSS-ECU
 
 
DIAGNOSIS
1. Using scan tool MB991958, diagnose the CAN bus line.
2. Checking whether OSS-ECU DTC B1161 is set
3. OSS-ECU DTC recheck