engine AUDI A8 1997 D2 / 1.G ATQ Engine Motronic Injection System Servicing Service Manual

24-64

Intake air system, checking for leaks
(unmetered air)


Special tools and equipment

Notes:
VAS5051 with VAG5051/1
orVAG1551 with VAG1551/3BEngine leak detection spray G 001 800 A1The negative pressure in the intake system sucks in the leak detection
spray with the unmetered air. Leak detection spray decreases ignition
quality and performance of the fuel mixture. This causes a reduction in
engine speed and a sharp increase of CO content. It is absolutely necessary to follow the safety precautions listed on the
can.
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Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select the control module for engine
electronics using "address word" 01 Page 01
-
9 .

Engine must run at idle for this.Rapid data transfer
HELP
Select function XX

When indicated on display:
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read Measurin
g Value Block
Q
Input display group number XXX

When indicated on display:
- Press buttons -0-, -0- and -1- to select "display group number 001" and
press -Q- button to confirm input.
Read Measuring Value Block 1
1
2
3
4

Indicated on display: (1 thru 4 display fields) - Make note of engine speed in display field 1.
- Spray intake system parts with engine leak detection spray in a
systematic manner.
Pa
ge 77 of 78 Motronic in
jection s
ystem, servicin
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11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU05.24.1

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If engine speed does not change:

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display (function selection):
If engine speed decreases:
-
Press button.- Press buttons -0- and -6- to select "End output" and press -Q- button to
confirm input.
- Switch ignition off.
- Check sprayed part of intake system for leaks, and eliminate the error.
Pa
ge 78 of 78 Motronic in
jection s
ystem, servicin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.24.1