engine coolant AUDI A4 2000 B5 / 1.G AHA ATQ Engines Secondary Air System Workshop Manual

& Ignition, Repair Group 01

Notes:

The secondary air injection system injects air
behind the exhaust valves during a cold start.
Cold start means engine coolant temperature
between 8-65 C (46-149 F). The amount of
air injected is temperature dependent.

The need for secondary air is triggered by the
Motronic Engine Control Module (ECM) -J220-
via the Secondary Air Injection (AIR) Injection
pump relay -J299- to the Secondary Air
Injection (AIR) solenoid valve -N112- and the
two combination valves.
When "Basic Setting" (scan tool function 04) is
initiated, a diagnosis for the secondary air
injection system can be carried out. The
diagnostics consists of a flow test and a leak
test.
Pa
ge 2 of 10 Secondar
y Air In
jection
(AIR
) system
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.26.2

26-16

Secondary Air Injection (AIR) system
components, removing and installing

Component locations page 26
-14
.
Fuel injection and ignition components.

Repair Manual, 2.8 Liter V6 5V Fuel Injection
& Ignition, Repair Group 24
Note:
Always replace gaskets and seals.

A - Combination valve, left

- Remove engine coolant expansion tank from
bracket.

- Disconnect vacuum line -1-.
- Disconnect connection tube -2- from combination valve.
Tightening torque: 10 Nm (7 ft lb).
- Remove bolts -3- for combination valve from cylinder head and remove
valve.
Tightening torque: 10 Nm (7 ft lb).
Pa
ge 7 of 10 Secondar
y Air In
jection
(AIR
) system
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.26.2