buttons AUDI A4 1998 B5 / 1.G AC System On Board Diagnostic Workshop Manual

01-11

- Press button -1- for operating mode "Rapid data
transfer." Rapid data transfer
HELP
Enter address word XX

Indicated on display
Notes:
If display is blank, check wiring to VAG1551/power supply using
Troubleshooting Procedure No. 1 in "Electrical Wiring Diagrams,
Troubleshooting and Component Locations" Manual.
Address word for A/C Heating Electronics: 08
Additional operating instructions can be obtained by pressing the
HELP button on VAG1551 Scan Tool (ST) During testing procedures, the button advances the program to the
next step An incorrect entry can be cancelled with the -C- button
- Press buttons -0- and -8-.
Rapid data transfer
Q
08 - A/C Heating Electronics

Indicated on display
- Press -Q- button to confirm input.
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01-12
If one of the following messages is displayed: Rapid data transfer
HELP
Control module does not answer

Indicated on display
or
Rapid data transfer
HELP
K wire not switchin
g to B+

Indicated on display
- Press HELP button to print out list of possible causes.
Rapid data transfer No si
gnal from control module

- Check wiring to Data Link Connector (DLC) according to wiring
diagram Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder.
Rapid data transfer Error in communication link

If this display appears at the beginning of or during the OBD program,
malfunctions have occurred and data transfer is no longer possible
between the VAG1551 Scan Tool (ST) and the A/C control head -E87-.
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Check wiring to DLC.
Rapid data transfer
Q
08 - A/C Heatin
g Electronics

- After repairing possible causes of the malfunction, press buttons -0-
and -8- to insert "AC/Heating Electronics" address word 08.
- Press -Q- button to confirm input.
Rapid data transfer Scan Tool sends address word 08

Indicated on display
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01-18

Check DTC Memory (function 02)


- Press buttons -0- and -8- to insert "AC/Heating
Electronics" address word 08 and advance
program until "Select function XX" appears on
display page01
-17
.

- Switch printer on by pressing PRINT button
(indicator lamp in button comes on). Rapid data transfer
HELP
Select function XX

Indicated on display (function selection)
- Press buttons -0- and -2- to select "Check DTC Memory" function 02.
Rapid data transfer
Q
02 - Check DTC Memor
y

Indicated on display
- Press -Q- button to confirm input.
Rapid data transfer
Q
X DTC reco
gnized

Number of stored DTCs is displayed
-
Press button.
Rapid data transfer
Q
No DTC reco
gnized

If "No DTC recognized" is displayed, the program returns to the starting
position after button is pressed page 01
-20
.
Notes:
-
Press button.
If the printer is switched on, stored DTCs are displayed and printed
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01-23
Notes

If 22 C (72 F) is always displayed after switching ignition off and on, regardless of last setting, check power supply
(terminal 30) to A/C control head -E87- using wiring diagram. If a malfunction is recognized at an air/temperature distribution flap motor potentiometer, air distribution can be altered by
pressing buttons on A/C control head -E87-.
To switch display from C (Celsius) to F (Fahrenheit)(and vice versa), press "Temperature +" button while holding
"recirculating air" button. If no DTC are displayed and air conditioning system complaints exist (e.g. compressor does not run or only occasionally,
system control unsatisfactory, speed of fresh air blower cannot be regulated etc.), perform function 03 "Output Diagnostic
Test Mode (DTM)" and 08 "Read Measuring Value block."
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01-44

Starting output Diagnostic Test Mode (DTM)

- Start engine, switch on compressor (press
"Auto" button), adjust air flow to center
instrument panel outlets only.

- Connect Scan Tool VAG1551 or 1552 in
operating mode -1-, enter address word 08 "A/C
Heating Electronics" and move forward in
program until "select function XX" appears in the
display.

- Switch on printer by pressing the PRINT button
(indicator lamp in button comes on).

- Check DTC memory page 01
-18
.

- Note any stored DTCs for reference and move
forward in program until "select function XX"
appears in the display. Rapid data transfer
HELP
Select function XX

Indicated on display (function selection)
- Press buttons -0- and -3-.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
- Press -Q- button to confirm input.
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01-52

Basic setting (function 04)


- Connect Scan Tool VAG1551 or 1552, enter
address word 08 "A/C Heating Electronics" and
move forward in program until "select function
XX" appears in the display.

- Switch on printer by pressing the PRINT button
(indicator lamp in the button comes on).

- Check DTC memory ( page 01
-18
) and repair
all malfunctions which are displayed.

- Erase DTC memory page 01
-55
.

- Check coding ( page 01
-57
) and re-code if
necessary.
Rapid data transfer
HELP
Select function XX

Indicated on display (function selection)
- Press buttons -0- and -4-.
Rapid data transfer
Q
04 - Basic Settin
g

Indicated on display
- Press -Q- button to confirm input.
Start basic settin
g
HELP
Input display number XXX

Indicated on display
- Press buttons -0- and -1-.
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01-55

Erase DTC Memory (function 05)


Requirements

DTC Memory checked

Erasing DTC memory

-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -5-.
Rapid data transfer
Q
05 - Erase DTC Memor
y

Indicated on display
- Press -Q- button to confirm input.
Rapid data transfer
Q
DTC Memor
y is erased!

Indicated on display
-
Press button.
Attention!DTC Memor
y is not interro
gated

Indicated on display
Notes:
If display appears as shown, check DTC memory and follow test
procedures carefully page 01
-18
.
If ignition was switched off between "Check DTC Memory" and "Erase
DTC memory," the memory is not erased. Check DTC memory once
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01-56

End output (function 06)


Requirements:

DTC Memory checked
Malfunctions repaired
Basic setting performed
DTC memory erased
A/C control head coding confirmed

Ending output

-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -6-.
Rapid data transfer
Q
06 - End Output

Indicated on display
- Press -Q- button to confirm input.
Rapid data transfer
HELP

Indicated on display
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01-58

Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -7-.
Rapid data transfer
Q
07 - Code Control Module

Indicated on display
- Press -Q- button to confirm input.
Code Control ModuleEnter code number XXXXX

Indicated on display
Coding m.y. 1996:
Note:
Coding example, m.y. 1996: 0 0 1 6 2
0 = open
0 = open
1 = compressor w/o Compressor Speed Sensor -G111-
(0 = compressor with -G111-) -
Press button.Code
Market
Compressor
Engine
00062
USA/CDN
Zexel
6-cylinder gasoline
00162
USA/CDN
Nippondenso
6-cylinder gasoline
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01-60

CAUTION!

Part numbers are for reference only.
Always check with your Parts Dept. for the
latest information.
Coding example:

- Enter code "00062" by pressing applicable
buttons on key pad of VAG1551.
Code Control ModuleEnter code number 00062

Indicated on display
Notes: - Press -Q- button to confirm input.
- Perform basic setting page 01
-52
.
Nippondenso A/C compressors must have A/C control head Part No.
index "H" installed to allow coding "00162." If an unrecognized code is entered in a control head, it is suppressed
and coding "00042" (4-cyl. gasoline engine USA) is then stored. When replacing an A/C control head, always refer to the most recent
parts information.
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