AUDI A4 1999 B5 / 1.G AWM Engine Secondary Air System Owner's Manual

26-60

Check voltage supply for secondary air
injection pump motor

- Remove sound insulation -arrows-.

- Disconnect connector from Secondary Air Injection (AIR) Pump motor -
V101- (-arrow-).
Location: Right front in engine compartment below air filter housing
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If LED does not flash:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
If no malfunction is found: - Connect voltage tester VAG 1527 B between contacts 1 and 2.
- Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air
Injection (AIR) Pump relay -J299-.

LED must flash.
- Carry out following tests:
- Check wiring connection from contact 1 of connector to secondary air
injection pump relay (in 3-pin relay carrier in electronic box (plenum
chamber), for open circuit.
- Check wiring connection of contact 2 of connector to Ground for
open circuit: - Replace Secondary Air Injection (AIR) Pump motor -V101-.
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26-62

Combination valve for secondary air
inlet, checking function and for leaks


Special tools and equipment

Test requirements:
Test sequence
Vacuum hand pump VAG 1390Vacuum lines and hose connections do not leak. Vacuum lines not blocked.

- Remove engine cover -arrows-.
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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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Combination valve for secondary air
inlet, removing and installing


Removing

- Remove engine cover -arrows-.

- Disconnect hoses -1- and -2- from combination valve.
- Unbolt combination valve -arrows-.
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Installing
Installation is carried out in the reverse order of
removal; note the following:

Note:
Replace gaskets and seals.

Tightening torque

Component
Nm
Combination valve for secondary air inlet at
cylinder head
10
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