1997 AUDI A4 APB Engine Exhaust System Components Workshop Manual

26-17

Exhaust manifold, removing and
installing


Removing

- Remove engine Page 10
-1 .

- Remove turbocharger Page 21
-1

- Unbolt exhaust manifold.

Installing

Notes:

Replace self-locking nuts.
Replace gaskets.

- Install in reverse sequence.
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26-18

Tightening torques

Bolted mountings Tightening
torques
Exhaust pipe between exhaust
manifold and turbocharger 25 Nm
Exhaust pipe with catalytic
converter to turbocharger 25 Nm
Exhaust manifold to cylinder
head 25 Nm
Exhaust pipe to transmission 25 Nm
Catalytic converter to front
muffler 25 Nm
Heat shield to turbocharger 10 Nm
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26-19

Exhaust gas temperature sensor,
checking for function


Special tools and equipment

Test requirement:
WARNING!
VAS 5051 with VAG 5051/1
orVAG 1551 with VAG 1551/3ACoolant Temperature at least 80 C. During a road test in an airbag-equipped vehicle, test equipment
must always be fastened to and operated from the rear seat by a
second technician. When driving or riding in an airbag-equipped vehicle, NEVER hold
the scan tool or other test equipment in your hands or lap while in
motion. Objects between you and the airbag increase the risk of
injury in an accident.
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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.
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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.
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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"
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26-23

- Repeat test for bank 2 measuring value block
221 If specified values are not obtained and there is a
malfunction stored in the Diagnostic Trouble
Code (DTC) memory:

- Check exhaust gas temperature sensor, Page
26
-24
.
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26-24


Exhaust gas temperature sensor,
checking

Special tools and equipment

VAG 1526A
VAG 1527B
VAG 1594A
VAG 1598/31
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