1997 AUDI A4 Cruise Control On Board Diagnostic Workshop Manual

01-210

Testing wiring and components using
VAG1598/31 breakout box


Notes:

VAG1598/31 breakout box is designed to be
connected to the engine control module
harness and to the engine control module
simultaneously.
The effect of this design is that the electronic
engine controls remain fully functional while the
breakout box is connected (for e.g. measuring
signal strengths while the engine is running).
Look in the respective test descriptions to see if
it is necessary to connect the engine control
module to the breakout box.
Use multimeter (Fluke 83 or equivalent) or
VAG1715 Multimeter in addition to VAG1527B
voltage tester.
Always use test leads from VW1594 connector
test kit when connecting test equipment to
VAG1598/31 breakout box.
Once the engine control module has been
reconnected, adapt the engine control module
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to the throttle valve control module.

Repair Manual, Fuel Injection & Ignition,
Repair Group 24

CAUTION!

Before connecting the test leads, switch the
test equipment to the appropriate measuring
range and observe the test requirements to
prevent damage to electronic components.
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01-211

- Switch ignition off.

- Remove control module protective housing
cover.

- Using screwdriver, carefully pry off retainer (arrow).
- Release and disconnect harness connectors from control module.

- Connect VAG1598/31 breakout box to harness connector. Connect
breakout box Ground clip (not visible in illustration) to battery negative
terminal. Check respective test descriptions to see if it is necessary to
connect engine control module to breakout box.
- Perform tests as described in respective repair instructions.
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01-212

- Disconnect 15-pin harness connector for cruise
control switch, clutch vacuum vent valve switch -
F36- and to brake vacuum vent valve switch -
F47- for cruise control.

- Check the following connections for a short to
positive, short to Ground (GND) or an open
circuit:

Gasoline engine: 2.7 liter/184 kW V6 twin-
turbo

Terminals on 15-pin
harness connector VAG1598/31 breakout
box, socket
7 76
8 75
9 57
10 38

- If necessary, repair open or short circuit.
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01-213

Terminals on 15-pin
harness connector VAG1598/31
breakout box,
socket
13
to clutch vacuum vent valve
switch -F36- (terminal 1) 39
11
to brake vacuum vent valve
switch -F47- for cruise
control (terminal 2) 56
12
to brake vacuum vent valve
switch -F47- for cruise
control (terminal 4) 55

- If necessary, repair open or short circuit.
Pa
ge 13 of 13 Cruise control On Board Dia
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)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.3