AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owner's Manual

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owner's Manual A4 1996 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/937/w960_937-0.png AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owner's Manual

Page 21 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-31
       If the LED does not light up:  
     
-  Check wiring from contact 1 on connector via 
fuse to fuel pump relay for an open circuit: 
     
       Electrical Wiring Diagrams, Troubleshooti

Page 22 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-32
       If the LED lamp does not flash or if it lights up 
continuously:  
     
-  Connect VAG 1598/31 test box to wiring 
harness leading to engine control module; 
engine control module should

Page 23 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-33
 
  
Wastegate Bypass Regulator valve -N75-, 
checking
 
Special tools and equipment  
 
VAG 1526 A
 VAG 1527 B
 VAG 1594 A
 VAG 1598/31
 VAS 5051 with VAS 5051/1
- or 
 VAG 1551 with VAG 1551/3

Page 24 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-34
      
Test requirements:  
     
Vehicle diagnostic, testing and information 
system VAS 5051 or VAG 1551 Scan Tool 
connected. 
     
Test sequence  
     
Note:  
     The Wastegate Bypass Re

Page 25 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-35
 
Output Diagnostic Test Mode -N75- waste
gate b
ypass re
gulator valve
    
Display  
If the injector does not click:  
If valve does not open or close properly:  
Checking internal resistance

Page 26 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-36
      
Checking power supply  
     
Test requirements:  
     
Fuse for wastegate bypass regulator valve 
OK 
     
       Electrical Wiring Diagrams, Troubleshooting & 
Component Locations bin

Page 27 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-37
       If the LED does not light up:  
     
-  Check wiring from contact 1 on connector via 
fuse to fuel pump relay for open circuit: 
     
       Electrical Wiring Diagrams, Troubleshooting

Page 28 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual -N75- waste
gate b
ypass re
gulator valve
 
LED must flash.
Pa
ge 28 of 34 Char
ge pressure leak test with VAG 1687
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&i

Page 29 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-38
       If the LED lamp does not flash or if it lights up 
continuously:  
     
-  Connect VAG 1598/31 test box to wiring 
harness leading to engine control module; 
engine control module should

Page 30 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Owners Manual 21-39
 
  
Charge Air Pressure sensor -G31-, 
checking
 
Special tools and equipment  
 
VAG 1526 A
 VAG 1594 A
 VAG 1598/31
 VAS 5051 with VAS 5051/1
- or 
 VAG 1551 with VAG 1551/3 A
Pa
ge 30 of 34
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