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6 Equipment- and model year dependent to
immobilizer and to automatic gearbox
7 19 4/25 14
- If necessary, eliminate open circuit in wiring/short.
3.5 - Wiring and component check using test box V.A.G 1598/31
Notes:
◆ The test box V.A.G 1598/31 is designed for simultaneous connection to the engine control unit wiring harness
and the actual engine control unit.
◆ This has the advantage that the electronic engine management system remains fully operational with the
test box connected (e.g. measurement of signals with engine running).
◆ Whether or not the engine control unit is additionally to be connected to the test box is indicated in the
appropriate test sequences.
◆ Use portable multimeter V.A.G 1526 or multimeter V.A.G 1715 and diode test lamp V.A.G 1527 for testing.
◆ Always use auxiliary leads from adapter set V.A.G 1594 for connection of testers to test box V.A.G 1598/31.
◆ After reconnecting the engine control unit, adapt it to the throttle valve control part.
=> Motronic fuel-injection and ignition system; Repair Group 24; Electronic throttle; Adapting throttle valve
control part Electronic throttle Adapting throttle valve control part
Attention:
So as not to destroy electronic components, select required measuring range before connecting test leads and
observe test conditions.
- Switch off ignition.
- Remove the cover of the control unit protective enclosure.
- -> Use screwdriver to carefully prise off securing strap -arrow-.
- Then unlock the control unit connectors and unplug them.
Audi A8 1994 ➤
Electrical system Self-diagnosis 02.99 ➤ - Edition 05.2002
3.4 - Checking cruise control system (CCS) - diesel engines 115
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