check engine light AUDI A4 2000 B5 / 1.G APB Engine Secondary Air System Workshop Manual

26-33


2 -
Motronic Engine Control Module (ECM) -
J220-
3 -
Combination valve for secondary air
injection (AIR)
4 -
Secondary Air Injection (AIR) solenoid
valve -N112-
Installation position Fig. 1
5 -
Secondary Air Injection (AIR) pump motor
-V101-
Installation position Fig. 2
6 -
Check valve
Installation position (light/dark side): Arrow
points in direction of flow, as shown in
figure.
7 -
To Intake manifold
8 -
Combination valve for secondary air
injection (AIR)
9 -
Vacuum reservoir Installation location: Under wheel housing
liner in wheel housing
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26-41

Checking voltage supply

- Disconnect connector from Secondary Air
Injection (AIR) solenoid valve -N112-.

If LED does not light: - Connect VAG 1527B voltage tester as follows:Harness connector terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly.

LED must light.
- Perform following tests marked with dots:

Check fuse -S234- (in fuse holder, position 34).
Pa
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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.GE05.26.2