relay AUDI A4 1999 B5 / 1.G APB Engine Secondary Air System Workshop Manual

26-32


Function:

In the cold start phase, the ECM -4- activates
the secondary air pump -2- via the relay for
secondary air pump -3-. Air reaches the
combination valves for Secondary Air Injection
(AIR) -5- and -9-.
The Secondary Air Injection (AIR) valve -6- is
activated in parallel, which allows the vacuum to
reach the combination valves for Secondary Air
Injection (AIR) -5- and -9-. The appropriate
combination valve for Secondary Air Injection
(AIR) thereby opens the path for secondary air
to the exhaust channels of the cylinder head.
1 -
Secondary Air Injection (AIR) pump relay -
J299-
Removing and installing Page 26
-37
checking Page 26
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Electrical Wiring Diagrams, Troubleshooting & Component Locations
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24

Checking activation
Check wire connection from terminal 1 of connector via fuse -S234-
(in fuse holder, socket 34) to Fuel Pump (FP) relay for open circuit: Check Fuel Pump (FP) relay.

- Connect VAG 1527B voltage tester between terminal 1 and 2.
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Secondary Air Injection (AIR) pump relay -
J299- and activation, checking

Special tools and equipment

VAG 1526A
VAG 1527B
VAG 1594A
VAG 1598/31
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Installation location Installation locations-
Overview.
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24


Test sequence

- 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


A - If relay does not trigger:
The Secondary Air Injection (AIR) pump relay (in 3-socket relay
carrier in the E-box, at left in plenum chamber, position 2) must
engage and the Secondary Air Injection (AIR) pump motor -V101-
must run in intervals
- Check voltage supply of Secondary Air Injection (AIR) pump relay
Page 26
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.
-
Check activation of Secondary Air Injection (AIR) pump relay Page
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B - If relay triggers, but Secondary Air Injection (AIR) pump does not run: 26
-49
.
- Check voltage supply of Secondary Air Injection (AIR) pump motor
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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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Electrical Wiring Diagrams, Troubleshooting & Component Locations Check wire connection from battery + (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.
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- 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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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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- 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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