1996 AUDI A4 engine

26-47

Checking voltage supply of Secondary Air
Injection (AIR) pump relay

- Switch ignition off.

- Remove Secondary Air Injection (AIR) pump
relay

- Connect multimeter for voltage measurement as
follows.

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

8 Engine
Ground
(GND)


Specification: approx. battery voltage
If specified value is not obtained:

- Perform following tests marked with dots:

Check fuse -S130- (40 A) in 3-socket relay carrier in E-Box, plenum
chamber, position 7.
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26-48

- Connect multimeter for voltage measurement as
follows:

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

4 Engine
Ground
(GND)

- Operate starter briefly.


Specification: approx. battery voltage
If specified value is not obtained:

- Perform following tests marked with dots:

Electrical Wiring Diagrams, Troubleshooting & Component Locations Check fuse -S234- (in fuse holder, position 34). Check wire connection from Secondary Air Injection (AIR) pump relay
-J299- (in 3-socket relay carrier in E-box, plenum chamber) via fuse -
S234- (in fuse holder, position 34) to Fuel Pump (FP) relay for open
circuit:
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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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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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pair&id=AUDI.B5.GE05.26.2

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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pair&id=AUDI.B5.GE05.26.2

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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pair&id=AUDI.B5.GE05.26.2