display AUDI A4 1999 B5 / 1.G APB Engine Exhaust System Components Workshop Manual

26-20

Test sequence

- Connect VAS 5051 tester or VAG 1551 scan
tool and select control module for engine
electronics using "address word" 01. Engine
must run at idle for this.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01

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 -1-, -1- and -2- to select "display group number 112" and
press -Q- button to confirm input.
Read measuring value block 112
1
2
3
4

Indicated on display (1...4 display fields) - Check exhaust gas temperature.
Pa
ge 20 of 30 Exhaust s
ystem com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.26.1

26-21

- Road test vehicle.


Wide Open Throttle (WOT) at engine
speeds between 5000...6500 RPM must be
reached.

Note:
Exhaust gas temperature must rise to above 980
C so that regulation sets in. Values below 945
C are displayed as 945 C.

Display fields

1 2 3 4
Display group 112: Exhaust temperature
Display
C
%
C
%
Indicated Exhaust temperature,
Bank 1 Enrichment factor,
Sensor, Bank 1 Exhaust temperature,
Bank 2 Enrichment factor,
Sensor, Bank 2
Specified
value 980
1)
90 5
2)
980
90 5
Note: Regulation does not begin
until temperatures above
980 C
If the enrichment factor is
above 30%, there is a
malfunction Regulation does not begin
until temperatures above
945 C
If the enrichment factor is
above 30%, there is a
malfunction
1) During oscillation stage, values around 1025 C may be displayed briefly. 2) During oscillation stage, values of 25 % may be displayed briefly.
Pa
ge 21 of 30 Exhaust s
ystem com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.26.1

26-22
If values above 20 % are displayed constantly,
then

fuel pressure may be too low,
mass air flow sensor signal may be too small.

- Select measuring value block 220.
Read measuring value block 220
1
2
3
4

Indicated on display (1...4 display fields) - Check exhaust temperature regulation.

Display fields

1 2 3 4
Display group 220: Exhaust gas temperature regulation
Display 1 RPM % % Text
Indicated Engine speed (RPM) Load Duty cycle, Sensor,
Bank 1 Operating condition,
Bank 1
Specified
value > 5000 > 100
42 10
Regulation on
Note: Increase engine speed and load enough that regulation
jumps to "on"
Pa
ge 22 of 30 Exhaust s
ystem com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.26.1