brakes AUDI A8 1996 D2 / 1.G 01V Transmission OBD Functions Workshop Manual

01-1


On Board Diagnostic (OBD),
function
The automatic transmission is controlled electro-
hydraulically.
The automatic Transmission Control Module
(TMC) -J217- receives information from
components that effect the selection of gears. It
passes the information on to solenoid valves that
control the solenoid valves in the valve body. The
solenoid valves convey the fluid pressure
generated by the ATF pump to the appropriate
clutches and brakes to be engaged.

Transmission Control Module (TMC) -J217-
malfunction recognition
The term "On Board Diagnostic (OBD)" applies
specifically to the electronic/electric control.
The control module is equipped with a Diagnostic
Trouble Code (DTC) memory so in the event of
an electronic/electrical component failure or on
open circuit, the malfunction can be determined
quickly. Malfunctions are recognized by electrical
signals and stored in the DTC memory together
with an indication of the type of malfunction and
malfunction location.
The control module recognizes malfunctions
during vehicle operation and stores them in a
DTC memory. This information will remain
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