AUDI A4 1998 B5 / 1.G AEB ATW Engines Secondary Air System User Guide

26-39
Installation location:

Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel
Injection & Ignition, Repair Group 24
- Initiate output Diagnostic Test Mode (DTM) and
activate Secondary Air Injection (AIR) pump
relay -J299-.

A - If relay does not trigger:
B - If relay triggers, but Secondary Air Injection (AIR) pump does not run:
The Secondary Air Injection (AIR) pump relay (in 3-socket relay
carrier in the E-box, at left in plenum chamber, position 2) must
trigger and the Secondary Air Injection (AIR) pump motor -V101-
must run in intervals
- Check voltage supply of Secondary Air Injection (AIR) relay Page
26
-40
.
- Checking activation of Secondary Air Injection (AIR) relay Page 26
-
42
.
- Check voltage supply for Secondary Air Injection (AIR) pump Page
26
-43
.
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pair&id=AUDI.B5.GE02.26.2

26-40

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

- Remove Secondary Air Injection (AIR) pump
relay.

If specified value is not obtained: - 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)

Specified value: approx. battery voltage
- Perform the following tests marked with dots:

Electrical Wiring Diagrams, Troubleshooting & Component Locations Check fuse S130 (40 A) in 3-socket relay carrier in E-Box, plenum
chamber, position 7. Check wire connection from Battery (B+) (terminal 30) to Secondary
Air Injection (AIR) pump relay -J299- (in 3-socket relay carrier in E-
Box, plenum chamber, position 2) for open circuit.
Pa
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11/18/2002 htt
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play?action=Goto&t
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pair&id=AUDI.B5.GE02.26.2

26-41


If specified value is not obtained: - 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.

Specified value: approx. battery voltage
- Perform the 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:
Pa
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pair&id=AUDI.B5.GE02.26.2

26-42

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

- Switch ignition off.

- Remove Secondary Air Injection (AIR) pump
relay.

If LED does not blink: - Connect VAG1527B voltage tester as follows:3-socket relay carrier in E-box, plenum
chamber, position 2
terminal
Measure to

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

LED must blink.
- Switch ignition off.
- Connect VAG1598/31 test box at wiring harness to ECM, do not
connect ECM.
Pa
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11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.GE02.26.2

26-43


If no malfunctions are detected:
Checking voltage supply of the Secondary Air Injection (AIR) pump
motor - Check the 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
VAG1598/31 test
box
socket
6 46
- Repair open circuit or short circuit if necessary.
- Replace Secondary Air Injection (AIR) pump relay -J299-.
- Remove harness connector for Secondary Air Injection (AIR) pump
motor -V101-.
- Connect VAG1527B voltage tester between terminals 1 and 2.
- Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air
Injection (AIR) pump relay -J299- Page 26
-42
.

LED must light.
Pa
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE02.26.2

26-44
If LED does not light:

- Perform the following tests marked with dots:

Check wire connection from harness
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 harness
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-.
Pa
ge 16 of 16 Secondar
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ystem, checkin
g (en
gine code ATW
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.26.2