check engine AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual A3 1998 8L / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/956/w960_956-0.png AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual

Page 1 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-29
 
  
Secondary air system, checking 
(engine code ATW) Following a cold start, the secondary air system 
helps to quickly heat the catalytic converter for 
quicker operating readiness.  
Princip

Page 3 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-31
 
  
 
To prevent unnecessary heating, the secondary 
air is diverted past the turbocharger -7-. For 
this, the charge air pressureregulation pressure 
unit opens the charge air pressure valve.

Page 7 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-35
      
Checking voltage supply  
     
-  Disconnect harness connector from Secondary 
Air Injection (AIR) solenoid valve -N112-. 
    
If LED does not light:  -  Connect VAG1527B voltage tester

Page 9 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-37
       If LED does not blink or if it remains constantly 
lit:  
     
-  Connect VAG1598/31 test box at wiring harness 
to ECM, do not connect ECM. 
    
If wire connection is OK:  -  Check the

Page 12 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-40
      
Checking voltage supply of Secondary Air 
Injection (AIR) pump relay  
     
-  Remove Secondary Air Injection (AIR) pump 
relay. 
    
If specified value is not obtained:  -  Connect mul

Page 13 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-41
 
    
If specified value is not obtained:  -  Connect multimeter for voltage measurement as follows.3-socket relay carrier in E-box, plenum 
chamber, position 2  
terminal  
Measure to  
  
4

Page 14 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-42
      
Checking activation of the Secondary Air 
Injection (AIR) pump relay  
     
-  Switch ignition off.
     
-  Remove Secondary Air Injection (AIR) pump 
relay. 
    
If LED does not blink

Page 16 of 16

AUDI A3 1998 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-44
       If LED does not light:  
     
-  Perform the following tests marked with dots:
     
Check wire connection from harness 
connector at Secondary Air Injection (AIR) 
pump motor -V101- to