engine AUDI A4 1995 B5 / 1.G Cruise Control On Board Diagnostic Workshop Manual

01-204

Gasoline engines with electronically-
operated throttle valve only


Testing cruise control system

- Connect VAG1551 scan tool ( Page 01
-241
)
and use "Address word 01" to select engine
control module.

The engine should be idling.
Except for the control lever, there are no system
components for the cruise control system. All
functions are carried out by the engine control
module.

Initiating "Read Measuring Value Block" scan
tool function 08 Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08.
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01-205

Rapid data transfer
Q
08 - Read Measuring Value Block

Indicated on display
- Press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input display group number XXX

Indicated on display
The measured value block which has been selected will appear in the
standard format.
Display group overview - Enter display group number 066.
The engine should be idling.
- Press -Q- button to confirm input.
Display group
number Display fields
066 1
= Actual vehicle speed km/h
2
= Switch positions of brake, clutch and cruise
control (open or closed)
3
= Desired vehicle speed km/h
4
= Control lever switch positions
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01-206
Display group 066 Read Measuring Value Block 66

Indicated on display
km/h X X X X km/h X X X X

Control lever switch positions
0 0 0 0 = Cruise control off (switch engaged)
0 0 1 1 = Cruise control on
0 0 0 1 = Cruise control off before engagement position
0 1 1 1 = Fix button pushed
1 0 1 1 = Record button pulled


Desired vehicle speed (speed last saved is displayed until):
Cruise control is switched off at control lever, i.e. switch is engaged on "OFF" orEngine is stopped.
Switch positions for brakes, clutch and cruise control released.
1 0 0 0 = Cruise control released
1 0 1 1 = Brake applied (brake pedal switch)
1 1 0 0 = Clutch applied
Actual vehicle speed
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01-207

Read Measuring Value Block 66
0 km/h
1 0 0 0
0km/h
0 0 0 0

Indicated on display
Checking displays in display fields 2 and 4
Read Measuring Value Block 66
0 km/h
1 0 0 0
0km/h
0 0 0 0

Display check, display field 2
If the nominal value in display field 2 for "cruise control released" (1000) is
not attained:
Repair Manual, Fuel Injection & Ignition, Repair Group 01
Test conditions
Display field 2
Cruise control released (activated) 1000
Brake applied (brake pedal switch) 1011
Clutch applied 1100
- Check engine control module identification.- If "G" is not displayed after component name, cruise control is not
activated. Activate cruise control system Page 01
-209
.
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01-208

Read Measuring Value Block 66
0 km/h
1 0 0 0
0km/h
0 0 0 0

Display check, display field 4
Test conditions
Display field
4
Switch -B- in "OFF" (AUS) position 0000
Switch -B- to "ON" (EIN) position 0011
Memory set, switch -B- to "OFF" (AUS) before
engaging 0001
Button -A- pressed, "SET" (FIX) 0111
Switch -B- to "RES" (AUFN) 1011

If the nominal values in display field 4 are not attained even though switch
-B- is set to "ON" (0011):
- Connect VAG1598/31 breakout box to engine control module harness
Page 01
-210
.
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01-209

Activating cruise control

- Connect VAG1551 scan tool (VAG1552)
Page 01
-241
.

- Insert "Address word 01" to select engine control
module. Rapid data transfer
HELP
Select function XX

Indicated on display
- Press button -1- twice for "Login procedure" function 11 and press -Q-
button to confirm input.
Login procedure
HELP
Input code number XXXXX

Indicated on display
Deactivate cruise control - Input code 11463 and press -Q- button to confirm input.
- Connect VAG1551 scan tool (VAG1552) Page 01
-241
.
- Use "Address word 01" to select engine control module.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press button -1- twice for "Login procedure" function and press -Q-
button to confirm input.
Login procedure
HELP
Input code number XXXXX

Indicated on display
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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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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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