Effect in the case of bus faults
If individual bus signals fail that are not stored in the fault code memory
Possible fault pattern or perception on failure of the corresponding bus signal |
Faulty or missing signal |
Transmitter control unit |
|---|---|---|
Terminal 15 not detected |
Status_Klemme_15 |
CAS |
Substitute programme (electronic emergency mode) no gear can be engaged |
Drehzahl_Motor |
DME |
Substitute programme (electronic emergency mode) |
Alive_Drehmoment_DME |
DME/ |
Substitute programme (electronic emergency mode) |
Checksumme_Drehmoment_DME |
DME |
Substitute programme (electronic emergency mode) |
Drehmoment_Ist |
DME |
Substitute programme (electronic emergency mode) |
Drehzahl_Motor_Fehler |
DME |
Unwanted gear changes |
Luftdruck_Motor |
DME |
No gear can be engaged |
Status_Kontakt_Bremspedal_DME1 |
DME |
Substitute gear shift programme |
Status_Regelung_Geschwindigkeit |
DME |
Forced to stay in current gear shift programme |
Status_Schalter_Warmlauf |
DME |
Incorrect gear shift programme |
Winkel_Fahrpedal |
DME |
Vehicle rolls back unexpectedly on uphill gradient |
Brake pressure |
DSC |
Unwanted gear changes |
Anforderung_Schaltbeeinflussung |
DSC |
Corners and gradients not detected |
Beschleunigung_Fahrzeug_Längs_DSC |
DSC |
Corners and gradients not detected |
Beschleunigung_Fahrzeug_Quer_DSC |
DSC |
Corners not detected/no L-R speed delta/no gear can be engaged |
Geschwindigkeit_Rad_HL |
DSC |
Corners not detected/no L-R speed delta/no gear can be engaged |
Geschwindigkeit_Rad_HR |
DSC |
Unwanted gear changes (gear shift intervention) |
Geschwindigkeit_Rad_VL |
DSC |
Unwanted gear changes (gear shift intervention) |
Geschwindigkeit_Rad_VR |
DSC |
No gear can be engaged |
Status_Kontakt_Bremspedal |
DSC |
Corners not detected |
Winkelgeschwindigkeit_Gier_DSC |
DSC |
Sports programme not possible |
Bedienung_Getriebewahltaster_Sport |
SZM |
|
|
|
ACC not functioning/deactivated |
Getriebestrang_Verstärkung |
EGS |
ACC not functioning/deactivated |
Status_Gang_Getriebe |
EGS |
ACC not functioning/deactivated |
Steuerung_Anzeige_Gang_Getriebe |
EGS |
ACC not functioning/deactivated |
Steuerung_Anzeige_Störung_Getriebe |
EGS |
MIL lamp activation, relevant OBD fault |
Status_OBD_Fehler_Getriebe |
EGS |
MIL lamp activation, relevant OBD fault |
Status_OBD_Getriebe |
EGS |
1. Torque intervention is deactivated. 2. ACC and DSC deactivation. 3. Consequence: EGS switches to emergency mode |
Alive_Drehmoment_EGS |
EGS |
EGS deactivated, consequence: Emergency operation |
Drehmoment_SOLL_EGS |
EGS |
EGS deactivated, consequence: Emergency operation |
Checksumme_Drehmoment_EGS |
EGS |
EGS deactivated, consequence: Emergency operation |
Drehmoment_SOLL_Verstellbereich_Positiv_EGS |
EGS |
Gearbox emergency program |
Status_Begrenzung_Anfahrmoment |
EGS |
Torque adjustment not carried out |
Status_Drehmoment_Soll_EGS |
EGS |
No cruise-control system, no comfort start, starting capability endangered |
Status_Gang_Getriebe |
EGS |
DSC warning light is activated / DSC not active / ABS OK |
Status_Gang_Getriebe |
EGS |
DSC and ACC inactive/ABS OK |
Drehzahl_Getriebe_Abtrieb |
EGS |
No reversing light |
Status_Gang_Getriebe |
EGS |
PDC not activated by reverse gear, only by button |
Status_Gang_Getriebe |
EGS |
Abbreviations |
Full expression |
ACC |
Active Cruise Control |
CAS |
Car Access System |
DSC |
Dynamic Stability Control |
EGS |
Electronic gearbox control |
SZM |
Centre Console Switch Centre |
PDC |
Park distance control |