relay AUDI A4 2000 B5 / 1.G AWM Engine Secondary Air System Workshop Manual

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Function

During the cold running phase, the engine
control module -6- actuates the secondary air
injection pump -1- via the secondary air
injection pump relay -5-. Air reaches the
combination valve for the secondary air inlet -3-.
Parallel to this the secondary air inlet valve -8-
is actuated, which allows the vacuum to reach
the combination valve for secondary air inlet -3-.
The combination valve for secondary air inlet
thus allows the secondary air to enter the
exhaust ducts of the cylinder head -9-.
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1 -
Secondary Air Injection (AIR) Pump motor
-V101-
Location Fig. 2
, Page 26
-45
2 -
Air cleaner
3 -
Combination valve for secondary air inlet
Location Fig. 4
, Page 26
-46
4 -
Non-return valve
Position (light side/ dark side or direction of
arrow) as shown in illustration, arrow faces
in direction of flow
5 -
Secondary Air Injection (AIR) Pump relay -
J299- Location Fig. 3
, Page 26
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Fig. 3 Installation position Secondary Air Injection (AIR) Pump
relay -J299-
In E-box in plenum chamber
1 - Engine control module
2 - Secondary air pump relay -J299-
3 - Power supply relay for Motronic -J271-
4 - Fuse S130 for secondary air pump

Fig. 4 Combination valve for secondary air injection
Right rear on cylinder head
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Checking power supply

Note:
The power supply for the secondary air injection
solenoid valve -N112- is via the fuel pump relay.

Test requirements:

Fuse for secondary air injection solenoid
valve OK.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder

Fuel pump relay OK.

Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24


- Disconnect connector from valve.

- Connect voltage tester VAG 1527 B as follows:Connector
Measure to
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If the LED does not light up:

- Check wiring from contact 1 on the connector
via the fuse to the fuel pump relay for an open
circuit:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
- Repair open circuit, if necessary
If the LED lights up:

- Check actuation.

Checking actuation

- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and activate secondary air
injection solenoid valve -N112-.

LED must flash.
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Secondary Air Injection (AIR) Pump relay -
J299- / Secondary Air Injection (AIR) Pump
motor -V101-, checking

Special tools and equipment

VAG 1526 A
VAG 1527 B
VAG 1594 A
VAG 1598/31
VAS 5051 with VAS 5051/1
- or
VAG 1551 with VAG 1551/3 A
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Test requirements:

Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool.

Test sequence

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

A - If relay does not respond:
B - If relay responds but secondary air injection pump motor does not
run:
The secondary air injection pump relay-2- (in electronics box of
plenum chamber, left) must respond and secondary air injection pump
motor -V101- must run intermittently.
- Check voltage supply of secondary air pump relay Page 26
-56
.
- Check actuation of secondary air injection pump relay Page 26
-58
.
- Check voltage supply of secondary air injection pump motor Page
26
-60
.
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Check voltage supply of secondary air
injection pump relay

- Switch ignition off.

- Remove secondary air injection pump relay.

If specified value is not attained: - Connect multimeter as follows to measure voltage.3-position relay carrier in E-box in plenum chamber,
position 2
Contact
Measure to

8 Engine
Ground
Specified value: approx. battery voltage
- Carry out following tests:

- Check fuse S130 (40 A) in electronics box of plenum chamber, (Pos.
4).
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- Check for open circuit in wiring from battery +
(terminal 30) to fuse S130 for secondary air
injection pump relay (in 3-position in E-box of
plenum chamber, position 2).

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder

If specified value is not attained: - Connect multimeter as follows to measure voltage.3-position relay carrier in E-box in plenum chamber,
position 2
contact
Measure to

4 Engine
Groung
- Operate starter briefly.
Specified value: approx. battery voltage
- Carry out following tests:

Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Check fuse S234 (in fuse box, position 34).
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- Check for open circuit in wiring from
secondary air injection pump relay (in 3-
position relay carrier in E-box of plenum
chamber) via fuse S234 (in fuse box, position
34) to fuel pump relay.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Check actuation of secondary air pump relay

- Switch ignition off.

- Remove secondary air injection pump relay.

- Connect voltage tester VAG 1527 B as follows:3-position relay carrier in E-box in plenum chamber,
position 2
contact
Measure to

6 Engine
Ground
- Initiate output Diagnostic Test Mode (DTM) and activate secondary air
injection pump relay.

LED must flash.
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