Audi A8 2010 - Page 51

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Note
♦ The test box -V.A.G 1598/42- has 105 sockets. It can be con‐
nected to the engine control unit via 2 different adapter cables.
♦ The engine control unit is connected to the vehicle's wiring
harness via two connectors, one of which has 60 pins, the
other has 94 pins.
♦ To carry out tests on the 60-pin wiring harness connector, the
adapter cable -V.A.G 1598/39-1- is connected to connector
-A- on the test box. For components connected to 60-pin wiring
harness connector ⇒ Current flow diagrams, Electrical fault
finding and Fitting locations.
♦ To carry out tests on the 94-pin wiring harness connector, the
adapter cable -V.A.G 1598/39-2- must be connected to con‐
nectors -A- and -B- on the test box. For components connec‐
ted to 94-pin wiring harness connector ⇒ Current flow
diagrams, Electrical fault finding and Fitting locations.
♦ The test box -V.A.G 1598/42- is designed so it can be con‐
nected both to the wiring harness for the engine control unit
and to the engine control unit itself at the same time. The ad‐
vantage of this is that the electronic engine control system
remains fully functional when the test box is connected (for
example, for measuring signals when the engine is running).
♦ Always use auxiliary measuring set -V.A.G 1527B- to connect
test equipment (e.g. voltage tester -V.A.G 1526E- , hand-held
multimeter -V.A.G 1594C- etc.).
The engine control unit has to be removed before connectors can
be unplugged from engine control unit ⇒ page 48 .
Caution
Electronic components are susceptible to damage.
♦ Select the appropriate measuring range before connect‐
ing the test leads and observe test requirements.
– Remove engine control unit ⇒ page 48 .
– Connect test box -V.A.G 1598/42- to wiring harness connec‐
tor. The earth clip on the test box must be connected to the
negative battery terminal. The instructions for performing the
individual tests indicate whether or not the engine control unit
itself also needs to be connected to the test box.
– Carry out test as described in appropriate repair procedures.
Installing engine control unit
Installation is performed in the reverse sequence.
The procedure required after connecting the new engine control
unit is described in the Guided Fault Finding or Guided Functions.
Note
After completion of the Guided Fault Finding routine, the tester
will attempt to erase the event memories of all control units. If this
is not successful, the remaining faults registered in the memories
must be rectified until all fault entries can be erased.
Audi A8 2010 ➤
Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
3. Engine control unit 47