AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst A4 1997 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/936/w960_936-0.png AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst

Page 11 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst 21-10
 
    
-  Connect T piece and measuring hose of turbocharger tester VAG 1397 
A to intake manifold (front). 
-  Route measuring hose under rear edge of hood and into passenger 
compartment via r

Page 12 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst 21-11
      
Note:  
     
Hose connections must be completely airtight, 
otherwise measurements will not be correct. 
     Ensure that measuring hose is not pinched at 
hood or side window. 
     Pre

Page 13 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst 21-12
 
Read measured value block 115  
1 
2 
3 
4
    
Note:  
The charge pressure level is measured with turbocharger tester VAG 
1397/A. The vehicle diagnostic, measuring and information system VAS

Page 14 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst 21-13
 Charge air pressure control malfunctions  Malfunction  
Possible causes  
Charge air pressure below 
specified value  
Wastegate Bypass Regulator valve -N75- faulty  checking,   Page 21
-33
Hos

Page 15 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst 21-14
      
Effects of leaks in intake or exhaust 
system
 
     
Leak downstream of mass air flow sensor  
     
Effect: Loss of power
     
Possible malfunction sources:
     
1 - Connection hoses

Page 16 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst 21-15
      
Leak downstream of exhaust turbocharger  
     
Effect: Charge pressure too low
     
Possible malfunction sources:
     
1 - Connection hoses and line between exhaust 
turbocharger and c

Page 17 of 17

AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst      
Possible malfunction sources:
     
1 - Exhaust turbocharger /exhaust manifold 
connection 
     
2 - Exhaust manifold/cylinder head connection
Pa
ge 17 of 17 Char
ge air s
ystem with turbochar
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