Interfaces; Can Information Exchange - Audi 243 Service Manual

CAN information exchange

In the case 4-level air suspension, the
information exchange between control unit
J197 for the self-levelling system and the
networked control units is performed via the
CAN drive with the exception of a few

interfaces.

Self-levelling suspension control
unit J197
System status (OK or not OK)
Warning lamp (on/off)
Self-diagnosis
Fault memory entry
Type of vehicle (e.g. allroad
quattro):
Level status
Intermediate level
Parking level
Impending adjustment
Adjustment active
Raising level
Lowering level
Switching to FR
Switching to FL
Switching to RR
Switching to RL
ESP influence
Information sent by the J197
control unit.
For detailed information on the CAN
bus, please refer to SSPs 186 and 213.
Interfaces
The system overview shows the information
provided by the gearbox control unit via the
CAN bus which is received and used by the
networked control units.
CAN drive high
Engine control unit:
Engine speed
ESP control unit:
Driving speed
ESP status
CAN drive low
Information received and
evaluated by the J197 control
unit.
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