AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking A8 1999 D2 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1004/w960_1004-0.png AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking
Trending: wiring diagram, air condition

Page 1 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-123
 
     
Turbocharger boost controls, 
checking 
     
Boost pressure regulation, checking
 
     
-  Connect VAG 1551 or VAG 1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Ele

Page 2 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-124
      
-  Compare display with specified value for 
wastegate bypass regulator valve duty cycle in 
display field 4: 
     
   Specified value: 5-95 %
      If displayed value is OK:  
     
-

Page 3 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-125
 
  
Display fields  
  
1   2   3   4  
Display group 114: Boost pressure regulation   
Display   xx.xx ms   xx.xx ms   xx.xx ms   xx %  
Indicates   Specified 
engine load  Corrected specifie

Page 4 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-126
       If the actual engine load is not within the 
tolerance, possible malfunctions are:  
     
Wastegate bypass regulator valve electrical 
malfunction 
     Hoses for wastegate bypass regul

Page 5 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-127
      
Wastegate bypass regulator valve, 
checking
 
     
Function  
     
With power off, the long connector is closed. 
     Both short connecters are inter-connected. 
     When triggered,

Page 6 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking       If necessary:  
     
-  Replace wastegate bypass regulator valve -N75-
. 
Pa
ge 6 of 17 Turbochar
ger boost controls, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Go

Page 7 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-128
      
Checking wastegate bypass regulator valve -
N75-  
     
-  Disconnect harness connector from valve -
N75-. 
    
If resistance is not OK:  -  Connect multimeter US 1119 (Fluke 83 or equ

Page 8 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-129
      
Check voltage supply for wastegate bypass 
regulator valve -N75-  
     
Note:  
     Voltage supply for the wastegate bypass 
regulator valve is provided by the fuel pump 
relay.

Page 9 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-130
      
Signal for wastegate bypass regulator valve, 
checking  
     
-  Disconnect harness connector for valve -N75 .
    
If LED test light does not blink, or stays on continuously:  -  Conne

Page 10 of 17

AUDI A8 1999 D2 / 1.G AEB Engine Turbocharger Boost Control And Checking 24-131
      
Barometric Pressure (BARO) sensor, 
checking
 
     
Note:  
     The signal from Barometric Pressure (BARO) 
sensor -F96- influences: 
     
Boost pressure limit
     Mixture compositio
Page:   1-10 11-20 next >
Trending: wiring diagram, air condition