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

26-49

Check activation of the Secondary Air
Injection (AIR) pump relay

- Switch ignition off.

- Remove Secondary Air Injection (AIR) pump
relay.

- Connect VAG 1527B voltage tester as follows:

3-socket relay carrier in E-box,
plenum chamber, position 2
terminal
Measure
to

6 B+

- Initiate output Diagnostic Test Mode (DTM) and
activate Secondary Air Injection (AIR) pump
relay -J299-.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01



LED must blink.
If LED does not blink:
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- Switch ignition off.
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26-50

- Connect VAG 1598/31 test box at wiring
harness to ECM, do not connect ECM.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24


- Check following wire connection for open circuit
and short circuit to Ground (GND) and B+:

3-socket relay carrier in E-
box, plenum chamber,
position 2
terminal
VAG 1598/31
test box
Bushing
6 46

- Repair open circuit or short circuit if
necessary.
If no malfunctions are detected:

- Replace Secondary Air Injection (AIR) pump
relay -J299-.
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26-51

Check voltage supply of the Secondary Air
Injection (AIR) pump motor

- Remove connector for Secondary Air Injection
(AIR) pump motor -V101-.

- Connect VAG 1527B voltage tester between
terminals 1 and 2

- Initiate output Diagnostic Test Mode (DTM) and
activate Secondary Air Injection (AIR) pump
relay -J299-.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01



LED must blink
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26-52
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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26-53

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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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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26-56
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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