AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual A3 1995 8L / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/956/w960_956-0.png AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual

Page 1 of 16

AUDI A3 1995 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 2 of 16

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-30
 
  
Function:  
 
In the cold start phase, the ECM -2- activates 
the secondary air pump -12- via the relay for 
secondary air pump -1-. Air is supplied to the 
combination valve for Secondary

Page 3 of 16

AUDI A3 1995 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 4 of 16

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-32
 
  
6 - 
Vacuum reservoir 
7 - 
Pressure unit for charge air pressure 
regulation 
8 - 
Turbocharger 
9 - 
Cylinder head 
10 - 
Combination valve for secondary air 
injection (AIR) 
11 - 
Air c

Page 5 of 16

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-33
 
  
Secondary Air Injection (AIR) solenoid 
valve -N112-, checking
 
Special tools and equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
 VAS 5051
- or 
 VAG1551 with VAG1551/3A
Pa
ge 5 of

Page 6 of 16

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-34
      
Test requirement 
     
Output Diagnostic Test Mode (DTM) 
performed 
     
Checking internal resistance  
     
-  Disconnect green harness connector from 
Secondary Air Injection (AIR)

Page 7 of 16

AUDI A3 1995 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 8 of 16

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-36
 
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   
 Repair Manual, Fuel Supply System, Repair Group 20
   
Checking activation  
Check wire connection from terminal 1 o

Page 9 of 16

AUDI A3 1995 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 10 of 16

AUDI A3 1995 8L / 1.G AEB ATW Engines Secondary Air System Workshop Manual 26-38
 
  
Secondary Air Injection (AIR) pump relay -
J299-, checking activation
 
Special tools and equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
Pa
ge 10 of 16 Secondar
y air s
ystem, check
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