1999 AUDI A4 light

26-43


1 -
Secondary Air Injection (AIR) Pump motor
-V101-
Location Fig. 2
, Page 26
-45
2 -
Air cleaner
3 -
Combination valve for secondary air inlet
Location Fig. 4
, Page 26
-46
4 -
Non-return valve
Position (light side/ dark side or direction of
arrow) as shown in illustration, arrow faces
in direction of flow
5 -
Secondary Air Injection (AIR) Pump relay -
J299- Location Fig. 3
, Page 26
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contact
1 Engine Ground
- Operate starter briefly.
LED must light up.
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If the LED does not light up:

- Check wiring from contact 1 on the connector
via the fuse to the fuel pump relay for an open
circuit:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
- Repair open circuit, if necessary
If the LED lights up:

- Check actuation.

Checking actuation

- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and activate secondary air
injection solenoid valve -N112-.

LED must flash.
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If the LED lamp does not flash or if it lights up
continuously:

- Connect VAG 1598/31 test box to wiring
harness leading to engine control module;
engine control module should not be connected:

Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24


If the wiring is OK: - Check for open circuit and short to positive or Ground in following
wiring connection: Connector
contact
Test box VAG 1598/31
2 9
- Repair any open/short circuit as necessary.
- Replace engine control module.
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- Remove vacuum hose -arrow- from combination valve.
- Connect hand vacuum pump VAG 1390 to vacuum unit of combination
valve.

If the combi valve does not open: - Disconnect hose -arrow- to combination valve for secondary air inlet.
- Blow into line with slight pressure (do not use compressed air).
Combi valve must be closed; blowing through must NOT be possible.
- Actuate hand vacuum pump.Combi valve must open; blowing through must be possible
- Replace combination valve Page 26
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.
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pair&id=AUDI.B5.GE06.26.2