key AUDI A4 1999 B5 / 1.G APB Engine Charge Air System With Turbocharger Workshop Manual

21-11


Notes: - Switch on turbocharger tester and set measuring range selector switch
to position -I- (absolute pressure).
- Connect measuring hose to connection -I-.
Hose connections must be completely airtight, otherwise
measurements will not be correct. Ensure that measuring hose is not pinched at hood or side window.Pressing memory key M on turbocharger tester will store the last
measured value until memory key M is pressed again or tester is
switched off. The decimal point in the display flashes to indicate that the value is
being stored. If the battery voltage of the turbocharger tester drops below the
minimum level, an arrow will appear at the top left of the display. Before performing the test, drive the vehicle at a brisk speed for at
least 3 km (without stopping at traffic lights etc.). A second mechanic is required to note the readings on the tester
when the vehicle is moving. Observe safety notes Page 21
-9 .
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21-12

- Accelerate vehicle from 2000 RPM at full throttle
in fourth gear, and watch rev counter.

Note:
If no charge pressure is obtained and a throbbing noise can be heard in
the engine compartment, the causes can be as follows: - Press memory key -M- on turbocharger tester at 3000 RPM.

Specification: 1.550 ... 1.650 bar
Air recirculation valve faulty.Vacuum line to air recirculation valve leaking or has become
disconnected.
Pa
ge 13 of 37 Char
ge air s
ystem with turbochar
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.21.1