AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/942/w960_942-0.png AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual

Page 1 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-41
 
  
Secondary air system Secondary air system, 
function/components
 
The secondary air system permits faster warm-up 
and thus makes the catalytic converter ready for 
operation sooner after c

Page 2 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-42
 
  
Function  
 
During the cold running phase, the engine 
control module -6- actuates the secondary air 
injection pump -1- via the secondary air 
injection pump relay -5-. Air reaches the 
c

Page 3 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-43
 
  
1 - 
Secondary Air Injection (AIR) Pump motor 
-V101- 
Location Fig.  2
 ,   Page 26
-45
2 - 
Air cleaner 
3 - 
Combination valve for secondary air inlet 
Location Fig.  4
 ,   Page 26
-46

Page 4 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-44
 
  
6 - 
Engine Control Module -J220- 
7 - 
Vacuum reservoir 
Location: In front left wheel housing 
beneath wheel housing liner 
8 - 
Secondary Air Injection (AIR) Solenoid 
valve -N112- Locat

Page 5 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-45
 
    
Note:  
The illustration shows bottom view of intake pipe.  Fig. 1  Installation position Secondary Air Injection (AIR) valve -
N112- 
Location: below intake pipe
1 - Recirculating valve

Page 6 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-46
 
    
Fig. 3  Installation position Secondary Air Injection (AIR) Pump 
relay -J299- 
In E-box in plenum chamber
1 - Engine control module 
2 - Secondary air pump relay -J299-
3 - Power supply

Page 7 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-47
 
  
Secondary Air Injection (AIR) Solenoid 
valve -N112-, checking
 
Special tools and equipment  
 
VAG 1526 A
 VAG 1527 B
 VAG 1594 A
 VAG 1598/31
 VAS 5051 with VAS 5051/1
- or 
 VAG 1551 wi

Page 8 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-48
      
Test requirements:  
     
Vehicle diagnostic, testing and information 
system VAS 5051 or VAG 1551 Scan Tool 
connected. 
     
Test sequence  
     
Note:  
     The secondary air injec

Page 9 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-49
 
    
-  Connect auxiliary hose to valve connector marked with an arrow.
-  Initiate output Diagnostic Test Mode (DTM) and activate secondary air 
injection solenoid valve -N112-. 
Output Diagn

Page 10 of 26

AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual 26-50
      
Checking internal resistance  
    
-  Disconnector connector of secondary air injection solenoid valve -
N112- (-Item 2-). 
    
If specified value is not attained:  
If specified value
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