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

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

Page 31 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-26
       If wire connection is OK:  
     
-  Replace Engine Control Module (ECM).
     
       Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel 
Injection & Ignition, Engine Code(s): APB, Repair Group

Page 32 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-27
 
  
Charge air pressure sensor -G31-, 
checking
 
Special tools and equipment  
 
VAG 1526A
 VAG 1594A
 VAG 598/31
 VAS 5051 with VAG 5051/1
- or 
 VAG 1551 with VAG 1551/3A
Pa
ge 32 of 37 Char

Page 33 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-28
      
Note:  
     The charge air pressure sensor -G31- and wire 
connections are monitored by the Engine Control 
Module (ECM). 
     
-  Connect VAS 5051 tester or VAG 1551 scan 
tool and sel

Page 34 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-29
      
Checking voltage supply  
     
-  Switch ignition off.
    
-  Remove engine cover (arrows).
-  Disconnect connector at charge air pressure sensor.
    
If specified value is not obtaine

Page 35 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-30
      
-  Connect VAG 1598/31 test box to wiring 
harness for Engine Control Module (ECM), also 
connect ECM -1-. 
     
       Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel 
Injection & Ignition,

Page 36 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-31
      
Checking signal wire  
     
-  Disconnect harness connector at charge air 
pressure sensor. 
     
-  Connect multimeter to socket 101 and socket 
108 of test box for voltage measurement

Page 37 of 37

AUDI A4 1998 B5 / 1.G APB Engine Charge Air System With Turbocharger Owners Guide 21-32
       If specified values are not obtained:  
    
If wire connection is OK:  -  Check following wire connection for open circuit and short circuit to 
Ground (GND) and B+: Harness connector te
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