AUDI A4 1999 B5 / 1.G Cruise Control System Workshop Manual

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Cruise control system,
removing and installing

Cruise control system for vehicles with
diesel engines

In vehicles with diesel engines, the functions of
the cruise control system are controlled by the
fuel injection control module.
Aside from the cruise control switch in the turn
signal lever, there are no additional components.
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Cruise control system for vehicles with
4 and 6-cylinder gasoline engines


CAUTION!

Disconnect the battery Ground (GND) strap
before working on the electrical system.

Notes:

Before disconnecting the battery, determine the
correct coding for the anti-theft radio.
Once the battery is reconnected, check and
activate the vehicle's electrical equipment
(radio, clock, comfort and convenience
features, etc.) as outlined in this Repair Manual
or the Owners Manual.

Vehicles with electronically-operated throttle
valve
In vehicles with fuel injection, the functions of the
cruise control system are controlled by the fuel
injection control module.
Aside from the cruise control switch in the turn
signal lever, there are no additional components.

Vehicles with mechanically-operated throttle
valve
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The cruise control, control module -J213- is
located behind the airbag unit on the passenger
side.
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Cruise control, control module -J213-,
removing and installing

Follow the sequence of operations below:

- Remove glove box.

Repair Manual Body Interior, Repair Group 68



- Detach control module -1- by removing Phillips-head screw -3- from
clip nut -2-.
Tightening torque: 3 Nm (27 in. lb)
- Withdraw control module from mounting bracket and disconnect
harness connector.
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Actuator linkage, adjusting


4-cylinder engines
Depending on the engine, only the installation position of the linkage
varies in the different 4-cylinder engines.
Follow the sequence of operations below:
The play -a- between linkage -2- and actuator -1- must be 0.5-1.0 mm. - Start engine and allow to idle (throttle valve at idle).
-
Screw in linkage -2- up to stop and then turn back one turn (360
90 ). - Secure linkage from moving (locknut).

6-cylinder engines
The adjustment is the same as on the 4-cylinder engine.
The play -a- between linkage -2- and the stop plate on cam plate -1- must
be 0.5-1.0 mm.
- Secure linkage from moving (locknut).
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Actuator, removing and installing

Depending on the engine, the installation position
of the individual actuators can vary.
Follow the sequence of operations below:

- Remove vacuum line.

- Unscrew or unclip linkage.

- Disconnect actuator from bracket (arrow).
Tightening torque: 25 Nm (18 ft lb)
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Vacuum pump, removing and installing

The vacuum pump is located under the ABS unit
and can be removed after removing the left-front
wheel housing liner.
Follow the sequence of operations below:

- Remove retaining nuts -3- (5 Nm or 44 in. lb) and remove unit toward
left through wheel housing.
- Lift vacuum pump -1- complete with its rubber nubs up and out of
bracket -2-.
4 - Vacuum line routing to actuator
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Vent valves, removing and installing


Follow the same procedure for both valves when removing and installing
the clutch pedal vent valve -1- and the brake pedal vent valve -2-.
Removing
Follow the sequence of operations below:
Installing
Note:
To ensure that the valve is seated firmly enough, the valve may only be
re-installed once. - Disconnect harness connector and vacuum line.
- Push or rotate vent valve out of its bracket.
Pedal in released position
- Push vent valve into bracket as far as stop (e.g. using 10 mm box
wrench); do not rotate it in.
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A new bracket is being used as of model year 1998 .
After installation, the vent valve must be in the following position: a - 0 - 0.7 mm
1 - Pedal stop surface
2 - Pedal bracket
3 - Bracket
4 - Vent valve
- Connect harness connector and vacuum line.
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Cruise control vacuum system,
checking for leaks

Follow the sequence of operations below:

- Remove vacuum line from vacuum pump.

- Push diaphragm on actuator inward.

- Plug removed vacuum line.

If actuator diaphragm remains pressed and
does not move: system is airtight
If actuator diaphragm returns to its original
position: system has a leak

Note:
Malfunctions can be caused by incorrectly set
vent valves, leaking actuators or by cracks in the
vacuum lines.
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