AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide A4 1998 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/965/w960_965-0.png AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide

Page 11 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide     
-  Connect T-piece with measuring hose of turbocharger tester VAG 1397 
A to fuel pressure regulator -arrow-. 
-  Route measuring hose under rear edge of hood and into passenger 
compartment via

Page 12 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 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

Page 13 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 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 eng

Page 14 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 21-13
      
Charge air pressure regulation, 
checking
 
     
Special tools and equipment  
    
or  
Test requirement: 
WARNING! 
VAS 5051 with VAG 5051/1VAG 1551 with VAG 1551/3ACoolant Temperature

Page 15 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 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 sele

Page 16 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide  
1 
2 
3 
4
-  Check charge air pressure regulation.
Pa
ge 16 of 37 Char
ge air s
ystem with turbochar
ger
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B

Page 17 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 21-15
      
-  Road test vehicle.
     
 
Wide Open Throttle (WOT) must be 
reached 
     
-  Measurement must be taken at Wide Open 
Throttle (WOT). 
  
Display fields  
  
1   2   3   4  
Display g

Page 18 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 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

Page 19 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide 21-17
      
-  Check correction factors in display fields 2 to 
4. 
  
Display fields  
  
1   2   3   4  
Display group 116: Charge air pressure regulation  
Display  1 RPM  
%  %  mbar  
Indicated

Page 20 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger User Guide        Repair Manual, Electrical Equipment, Repair 
Group 90
   
Pa
ge 20 of 37 Char
ge air s
ystem with turbochar
ger
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pai
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