AUDI A4 1997 B5 / 1.G AC System On Board Diagnostic Manual PDF

01-50

VAG1551 scan tool
display Specified function
Corrective action
Interior Temperature
Sensor Fan V42 - V42 (for temperature sensor in
instrument panel) is switched on and off
every 5 seconds1) - Test wiring/connections between V42 and -E87- for
open circuit or short circuit to ground using wiring
diagram
- Test voltage supply for V42 using wiring diagram
- Check intake slot and intake hose for
restriction page 87
-145

- Replace -E87-
1)Confirm operation by blowing smoke over intake slot on center of instrument panel.
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01-51

VAG1551 scan tool display
Specified function
Corrective action
Segment test
- All segments of A/C control head -
E87- are switched on and off every 3
seconds - Replace bulbs page 87
-126
- Replace -E87-
Outside Air Temperature
Display G106 in Auto Check
System1) - Temperature display in Auto Check
System1) begins counting up at 3
second intervals - Test wiring/connections between -E87- and
G106 for open circuit or short circuit using wiring
diagram
- Test positive and ground connections to G106
for open circuit using wiring diagram
- Test Auto Check System1)
- Replace -E87-
1) If equipped.
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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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- Press -Q- button to confirm input.
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01-53

Note:
The following flap motors are actuated in
sequence and end positions are stored in A/C
control head -E87-:

Temperature Regulator Flap Motor -V68-
Central Flap Motor -V70-
Footwell/Defroster Flap Motor -V85-
Air Flow Flap Motor -V71-
End positions are determined from resistance
values of potentiometers installed in the
air/temperature flap flap motors.
Basic settin
g 1
XXX XXX XXX XXX

Indicated on display
Basic settin
g 1
0 0 0 0

Indicated on display
When all display fields indicate "0", basic setting is ended.
-
Press button.
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01-54

Notes:

For m.y. 1996, because A/C engine coolant
temperature sensor G110 is not installed on
USA/CDN models, during basic setting, DTC
"00799 engine coolant temperature sensor
G110" is stored and must be erased.
For m.y. 1997 A/C engine coolant temperature
(ECT) sensor -G110- is deleted, and will no
longer load a DTC when checking DTC memory
after ending basic setting.

- Check DTC memory page 01
-18
.

- Erase DTC memory (function 05) and end
output (function 06) page 01
-55
.
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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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again.
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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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Enter address word XX
- Switch ignition off and disconnect VAG1551 Scan Tool (ST) from Data
Link Connector (DLC).
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