AUDI A4 1997 B5 / 1.G Cruise Control On Board Diagnostic Workshop Manual

01-203


Cruise control On Board
Diagnostic (OBD)

Special tools, test equipment and auxiliary
items

VAS5051 Diagnostic Operation Center (DOC)
and/or VAG1551 Scan Tool (ST).
VAG1551/3 adapter cable
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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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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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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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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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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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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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- Input code 16167 and press -Q- button to confirm input.
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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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