1999 AUDI A4 APB Engine Secondary Air System Workshop Manual

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If LED does not blink:

- Perform following tests marked with dots:

Check wire connection from connector at
Secondary Air Injection (AIR) pump motor-
V101- to Secondary Air Injection (AIR) pump
relay -J299- (in 3-socket relay carrier in E-
Box, plenum chamber, position 2) for open
circuit.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

Check wire connection from connector at
Secondary Air Injection (AIR) pump motor -
V101- to Ground (GND) connection 1 in
engine compartment wiring harness for open
circuit:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations
If no malfunctions are detected:

- Replace Secondary Air Injection (AIR) pump
motor -V101-.
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Combination valve, checking


Special tools and equipment

Test requirements:
VAG 1390 Hand Vacuum PumpNo leaks in vacuum lines or hose connections. Vacuum lines not clogged.

- Remove bolts (arrows) and remove engine covers -A- and -B-.
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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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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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If the relevant combination valve opens:

- Repeat function test at second combination
valve.

Note:

Use special tool 3231 and the Hazet carburetor
adjustment key 4530.
No special tools are necessary for the right
combination valve.
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