check engine AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual A4 1997 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/964/w960_964-0.png AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual

Page 16 of 30

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual 26-16
      
Exhaust system, checking for leaks
 
     
-  Start engine and run at idling speed.
     
-  Plug tailpipe (e. g. with rag or stopper) and leave 
plugged until check is complete. 
     
-

Page 20 of 30

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual 26-20
      
Test sequence  
     
-  Connect VAS 5051 tester or VAG 1551 scan 
tool and select control module for engine 
electronics using "address word" 01. Engine 
must run at idle for this.

Page 22 of 30

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual 26-22
       If values above 20 % are displayed constantly, 
then  
     
fuel pressure may be too low,
     mass air flow sensor signal may be too small.
     
-  Select measuring value block 220.
Re

Page 25 of 30

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual 26-25
      
Checking voltage supply  
     
-  Switch ignition off.
    
-  Remove engine cover (arrows).
-  Disconnect connector at exhaust gas temperature sensor.
    
-  Connect VAG 1527B voltage

Page 26 of 30

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual 26-26
       If LED does not light:  
     
-  Perform following tests marked with dots:
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   
 Repair Manual, 2.7 Liter V6 5V BiTu

Page 27 of 30

AUDI A4 1997 B5 / 1.G APB Engine Exhaust System Components Workshop Manual 26-27
 
    
If wire connection is OK:  
If the same malfunction occurs again after replacing the exhaust gas 
temperature sensor:  
 Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,