Audi AMB Service Manual page 223

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
Before performing test, drive vehicle at brisk speed for at least 3 km

without stopping (i.e. along route without traffic lights, etc.).
A second mechanic is required to note readings on tester when vehicle is

moving.
Reading measured value block 115 -->
1 2 3 4
Read measured value block, display group 115, engine idling.

Accelerate vehicle from 2000 RPM to wide open throttle in third gear and watch rev counter.

At approx. 2500 RPM, press print key on VAS5051 or PRINT key on VAG1551 while simultaneously

pressing memory key -M- on VAG1397A.
Fig. 294: Identifying Turbocharger Tester V.A.G 1397 A
Courtesy of VOLKSWAGEN UNITED STATES, INC.
NOTE:
The charge air pressure should be measured using turbocharger tester

VAG1397/A. Vehicle diagnostic, testing and information system VAS5051
or scan tool VAG1551 is used to check whether charge air pressure is
being registered by control module.
Specification for VAG1397A : 1.500 to 1.600 bar

Specification on VAG1551 or VAS5051 in display zone 4:

Reading measured value block 115 -->
1 2 3 4
1500 to 1600 mbar
If reading does not match specification, troubleshooting table.
Malfunctions in charge air pressure control
Malfunction
2005 Audi A4 Quattro
1:01:16 AM Page 211
Possible cause of trouble