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DTC B1140 KOS authenticate error
 
 
 
 
DIAGNOSTIC FUNCTION
If any abnormal data is received from KOS-ECU as a result of the certification communication with KOS-ECU, OSS-ECU sets the DTC B1140, and displays the immobilizer certification system inspection warning screen to the multi information display of the combination meter.
 
 
DTC SET CONDITION
Check Conditions
  • At KOS-ECU certification (at transition of power supply mode from OFF to ACC)
Judgment Criterion
  • As a result of the certification communication with KOS-ECU, OSS-ECU receives the abnormal data from KOS-ECU.
 
 
TROUBLESHOOTING HINTS
  • KOS-ECU malfunction (KOS-ECU has been interchanged between two vehicles, or various registrations are not complete after KOS-ECU replacement)
  • Malfunction of the CAN bus line
  • Malfunction of OSS-ECU
 
 
DIAGNOSIS
1. Using scan tool MB991958, diagnose the CAN bus line. (after turning the forced power supply output to "IG-ON" using the scan tool MB991958)
2. KOS-ECU diagnostic trouble code check (after turning the forced power supply output to "IG-ON" using the scan tool MB991958)
3. OSS-ECU DTC recheck