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).
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26-54


Leak test - Remove air distributor (arrows).

If it is possible to blow through hose:
If it is no longer possible to blow through hose: - Pull hose from Secondary Air Injection (AIR) pump motor and blow in
with light pressure (do not use pressurized air).
Both combination valves must be closed, it must not be possible to
blow through hose
- Disconnect connecting line from Secondary Air Injection (AIR) pump
motor to combination valve at one of the combination valves, close
connecting line and blow through again.
- Replace combination valve remaining on connecting line
- Replace combination valve that was removed from connecting line.
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26-55

Functional check

- Remove vacuum hose of combination valve to be checked and connect
VAG 1390 vacuum pump to combination valve.

If the relevant combination valve does not open: - Pull hose from Secondary Air Injection (AIR) pump motor and blow in
with light pressure (do not use pressurized air).
- Operate hand vacuum pump.
The relevant combination valve must open, it must not be possible to
blow through
- Replace combination valve.
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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