Fault patterns, IHKA controls

Impact of bus faults

If individual bus signals fail that are not stored in the fault code memory

- First, perform troubleshooting on the corresponding transmitter control unit.
- If the transmitter control unit is OK, troubleshooting must be run on the receiver control unit.

Possible fault symptom or perception on failure of the corresponding bus signal	Faulty or missing signal	Transmitter control unit
No backpressure compensation	Geschwindigkeit_Fahrzeug	DSC module
No filter-status recognition	Zeit_Tag_Zähler_Absolut	Instrument cluster
No resetting of operating time after service	ID2_BOS_Rückstellung	Instrument cluster
No resetting of operating time after service	ID_Funktion_BOS_Rückstellung	Instrument cluster
No resetting of operating time with filter change	Verfügbarkeit_BOS_Rückstellung	Instrument cluster