AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 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 User Guide

Page 11 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide       With VAS 5051 diagnostic tool connected:  
     
-  Erase DTC memory.
      If smoke generator was not used to fill the 
system with smoke:  
     
-  Apply soapy water solution or equivalent to

Page 12 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-23
      
Note:  
     An ultrasonic detector may also be used to 
detect extremely small leaks. 
     
-  Inspect intake system connections for leaks.
     
-  Repair any leaks found.
     
- Remo

Page 13 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-24
      
Mechanical air recirculation valve, 
checking
 
     
Note:  
     
The mechanical air recirculation valve is 
upstream of the exhaust turbocharger. It is 
opened via vacuum by the recirc

Page 14 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-25
      
Test sequence  
    
If the air recirculation valve does not open and close as specified, or if the 
valve plate does not seal properly when the valve is closed:  -  Attach vacuum pump VA

Page 15 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-26
 
  
Recirculating valve for turbocharger -
N249-, 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 1

Page 16 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-27
      
Test requirements:  
     
Vehicle diagnostic, testing and information 
system VAS 5051 or VAG 1551 Scan Tool 
connected. 
     
Test sequence  
     
Note:  
     The recirculating valve

Page 17 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-28
 
    
-  Connect auxiliary hose to valve connector marked with an arrow.
-  Initiate output Diagnostic Test Mode (DTM) and activate recirculating 
valve for turbocharger -N249-. 
Output Diagnos

Page 18 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-29
      
Checking internal resistance  
    
-  Disconnect connector from recirculation valve for turbocharger -N249- 
(-1-). 
    
If specified value is not attained:  
If specified value is atta

Page 19 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide 21-30
      
Checking power supply  
     
Note:  
     The power supply for the recirculating valve is via 
the fuel pump relay. 
     
Test requirements:  
     
Fuse for recirculating valve OK.

Page 20 of 34

AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test User Guide contact  
1   Engine Ground  
-  Operate starter briefly. 
The LED must light up. 
Pa
ge 20 of 34 Char
ge pressure leak test with VAG 1687
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?actio
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