display AUDI A4 1998 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 injection solenoid valve -
N112- and the wiring connections are monitored
by the engine control module.

- Read out Diagnotic Trouble Code (DTC)
memory of engine control module.
If a DTC relating to the secondary air injection
solenoid valve -N112- is displayed:

Note:
The illustration shows bottom view of intake line. - Remove hoses from secondary air injection solenoid valve -N112- (-2-)
but leave electrical connector plugged in.
Location: below intake line
Pa
ge 8 of 26 Secondar
y air s
ystem
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.26.2

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 Diagnostic Test Mode Secondar
y air in
jection solenoid valve -N112-

Display:
If the injector does not click:
If valve does not open or close properly:
The valve should click ... ... and should open and close (check by blowing into the auxiliary
hose).
- Check internal resistance of valve.
- Replace secondary air injection solenoid valve -N112-.
Pa
ge 9 of 26 Secondar
y air s
ystem
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.26.2