lock AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual
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Page 1 of 30

26-1
Exhaust system components,
removing and installing
Notes:
Removing and installing exhaust manifold
Page 26
-17
After working on the exhaust system ensure
that the system is not under stress, and that it
has sufficient clearance from the bodywork. If
necessary, loosen double and single clamps
and align muffler and exhaust pipe so that
sufficient clearance is maintained to the
bodywork and the support rings are evenly
loaded.
Aligning exhaust system free of stress Page 26
-11
Replace self-locking nuts.
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Page 17 of 30

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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Page 20 of 30

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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Page 22 of 30

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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