Volkswagen Golf / Golf GTI / Jetta. Manual - part 98

26-30

 

  

  

Safety precautions 

 

  

   Observe the following if test and measuring 

instruments are required during a test drive:  

  

  

 Test and measuring instruments must be 

secured to rear seat and operated by a 2nd 
person from this location. 

  

  

   If test and measuring instruments are operated 

from the front passenger's seat and the vehicle 
is involved in an accident, there is a possibility 
that the person sitting in this seat may receive 
serious injuries when the airbag is triggered. 

Secondary air system

26-31

 

  

  

Secondary air system, 
checking 

 

  

  

Special tools and equipment  

    

Note:  

All functions which could previously 
be performed with V.A.G 1551/1552 
can also be performed with the 
tester VAS 5051. 

Test conditions  

 V.A.G 1551 Scan Tool (or 

vehicle system tester V.A.G 
1552) with cable V.A.G 1551/3 

    

 Fuses must be OK. 

Secondary air system

26-32

 

    

 Electrical Wiring Diagrams, 

Troubleshooting & Component 
Locations 

 

Repair Manual, 2.8 Liter VR6 4V 

Fuel Injection & Ignition, Engine 
Code(s) BDF, Repair Group 01

 

Checking activation  

 

Repair Manual, 2.8 Liter VR6 4V 

Fuel Injection & Ignition, Engine 
Code(s) BDF, Repair Group 01

 

If activation is OK:  

 Main fuses must be OK. 

 Battery voltage must be at least 

11.5 V. 

 All electrical consumers, e.g. 

lights and rear window defroster 
must be switched off. 

 If the vehicle is equipped with air 

conditioning, this must be 
switched off. 

 Fuel pump (FP) relay -J17- must 

be OK, checking: 

 No DTCs may be stored in DTC 

memory: 

-  Check activation of Secondary air 

injection solenoid valve -N112- 
and Secondary air injection pump 
relay -J299- via On Board 
Diagnostic (OBD): 

-  Perform functional check 

 

Page 

26-33

 . 

Secondary air system

26-33

 

  

   Functional check  

  

   Test conditions  

  

  

 Vacuum lines and hose connections 

free of leaks. 

  

  

 Vacuum lines not blocked or kinked. 

  

  

 Selector lever must be in position "P" or 

"N" on models with an automatic 
transmission. 

  

  

 Coolant temperature must be at least 85 

C,

display group 1, display zone 2. 

  

  

 Oxygen sensor aging before catalytic 

converter OK, checking: 

  

  

 

Repair Manual, 2.8 Liter VR6 4V Fuel 

Injection & Ignition, Engine Code(s) BDF, 
Repair Group 24

 

  

   Note:  

  

   The diagnosis will only be ended if the 

oxygen sensor aging diagnosis before 
catalytic converter is completed successfully 
first. 

Secondary air system