Self-Study Program

50
Note
The CAN information exchange processes
shown here refer only to information relevant
to the gearbox.
CAN information exchange with the 09D gearbox on the Audi Q7
J217 – Automatic gearbox control unit
● System status
● Fault memory entry/status
● Selector mechanism active
● Coding in engine control unit
● Momentary gear or target gear
● Selector lever position
● Motion resistance index
● Information on emergency running mode and
self-diagnosis
● OBD status
● Nominal idling speed
● Torque gradient limitation
(converter/gearbox protection)
● Converter/gearbox protection status
● Selector lever position display
● Nominal engine torque (gearbox intervention)
● CAN sleep indication
● Torque converter lockup clutch status
● Self-diagnosis/measured data
● Compressor "off"
● Cooling demand
● Turbine speed
Gearbox control unit
J285 – Control unit with display in dash panel
insert
● Ambient temperature
● Mileage (km)
= information sent by the
gearbox control unit
= information received by the
gearbox control unit
Diagnostic port
Dash panel insert CAN bus
Diagnostics CAN bus
Powertrain CAN bus
CAN node
CAN Extended