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