lock AUDI A4 1997 B5 / 1.G APB Engine Charge Air System With Turbocharger Workshop Manual

21-1


Charge air system with
turbocharger

Turbocharger, removing and installing

Observe rules for cleanliness Page 21
-8 .

Notes:

Turbochargers must be replaced in pairs.
Manufacturing tolerances may prevent matched
operation.
All hose connections are secured with clips.
Charge air system must be free of leaks.
Replace self-locking nuts.
Replace all seals and gaskets

- Remove engine Page 10
-1 .

Removing right-hand turbocharger

- Remove cover panel from right-hand cylinder head cover -arrows-.
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21-6


Installing
Notes:
When installing turbocharger, be sure that o-ring at connection flange for
oil return is not damaged. - Disconnect oil return line -1-.
- Disconnect water line -2-.
- Remove turbocharger -3- (3 bolts).
- Installation is the reverse of removal.

The text "Abgasturbocharger" must be readable as shown in illustration,
install turbocharger hose -1- properly if necessary.
The hose clamps -2- must be installed as shown in illustration. The bolt-
locks on the screw clamps must be placed at the X-marking on the hose.
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21-14

Test sequence

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 01
- 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.
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 displa
y group number XXX

When indicated on display
- Press buttons -1-, -1- and -5- to select "display group number 115" and
press -Q- button to confirm input.
Read Measuring Value Block 115

Indicated on display (1...4 display fields)
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21-16

- Select measuring value block 117.

- Check function of accelerator pedal in display
field 2 by briefly depressing pedal to Wide Open
Throttle.

Display fields

1 2 3 4
Display group 117: Charge air pressure regulation
Display 1 RPM
% % mbar
Indicated Engine speed (RPM)
Accelerator pedal
position Throttle valve angle Specified charge air
pressure
Specified value
0...100
Note: If the specified value 100% is not reached at
Wide Open Throttle (WOT):

- Check accelerator pedal.

- Select measuring value block 116.
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21-18
If display field 4 indicates a correction factor <0
%, intake air is too hot or the sensor for intake air
temperature is faulty.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24


- Select measuring value block 114.

Display fields

1 2 3 4
Display group 114: Charge air pressure regulation
Display
%
%
% %
Indicated
Specified engine load (without
correction) Specified engine load (after
correction) Actual
load Duty cycle
CAPR-cyclical
valve
Specified
value 136,0
134,3
137,5 55,2
Note: Load values in display fields 1 to 3 can deviate
from each other by up to 5 %. If specified values are not achieved in the
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measuring value blocks:

- Check the charge air pressure sensor -G31-.
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