2000 AUDI A4 APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual

24-15


Intake manifold, removing and installing

Note:
The procedure is described for vehicles with
manual transmission. On vehicles with automatic
transmission remove also the secondary air
injection pump.
- Remove air distributor Page 24
-43
.
1 -
Unclip Wastegate Bypass Regulator Valve
-N75 from fuel rail.
Pa
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24-16


2 -
Disconnect harness connector from EVAP
Canister Purge Regulator Valve -N80.
3 -
Loosen both exhaust temperature
sensors -G235 and -G236 from intake
manifold. The sensors remain connected.
Ensure Ground cable is tight when
installing.
4 -
Loosen hose to brake booster at
bulkhead.
Pa
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jection
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24-17


5 -
Disconnect harness connector from
Recirculating valve for turbocharger -
N249.
6 -
Loosen indicated hose. The hose leads to
a vacuum reservoir.
7 -
Disconnect harness connectors of fuel
injectors from cylinder bank 1 and bank 2.
8 -
Loosen indicated hose. This hose leads to
the suction side of turbocharger bank 2.
Pa
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jection
(MFI
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24-18


Repair Manual, 2.7 Liter V6 5V BiTurbo Engine
Mechanical, Engine Code(s): APB, Repair Group 15
9 -
Disconnect harness connector at Throttle
Valve Control Module -J338.
10 -
Disconnect harness connector at Charge
Air Pressure Sensor -G31.
11 -
Remove indicated pressure hoses 12 -
Loosen indicated hose, this hose leads to
bypass valve.
13 -
Disconnect harness connector at Intake
Air Temperature (IAT) Sensor -G42.
14 -
Loosen indicated hose, (crankcase
ventilation hose).
Pa
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jection
(MFI
) system, servicin
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24-19


WARNING!
Fire hazard! DO NOT smoke or work near
heaters of have anything in the area that can
ignite fuel. The fuel system is pressurized.
Before loosening hose connections or opening
the test connection), place a cloth around the
connection.
Install intake manifold in reverse order. (Tightening
torque of bolts: 10 Nm) 15 -
Loosen indicated hose. This hose leads to
the suction side of turbocharger bank 1.
16 -
Loosen fuel return line from fuel rail
(catch escaping fuel with clean rag).
17 -
Loosen fuel supply line from fuel rail.
18 -
Loosen indicated hose at EVAP valve.
- Unbolt intake manifold from cylinder
heads and carefuly lift intake manifold
from cylinder heads.
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jection
(MFI
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24-20

Wiring and component check with
VAG1598/31 test box


Notes:

The VAG1598/31 test box is designed so it can
be simultaneously connected to the control
module wiring harness and to the control
module itself.
This has the advantage of enabling the engine
management system to remain fully operational
even with the test box connected (for example,
when testing signals while the engine is
running).
The instructions for performing the individual
tests indicate whether or not the engine control
module itself also needs to be connected to the
test box.
Use the hand multimeter Fluke 83 (or
equivalent) or the multimeter VAG1715 and the
diode test lamp VAG1527 for the checks.
To connect the testers to VAG1598/31 test box,
always use the adapter leads from VAG1594 A
connector test kit.

Required special tools and test equipment
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jection
(MFI
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VAG1598/31
Pa
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jection
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24-21

Work sequence

- Switch off ignition.

- Pull rubber gasket forward.

- Remove plenum cover forward.

- Remove cover for E-box (in plenum chamber).

CAUTION!
To prevent damage to the electronic components, switch to the
respective measuring range before connecting the measuring cable
and observe the test requirements. - Carefully lever off the retainer bar with a screwdriver -arrow-.
- Release connectors on engine control module and disconnect
connectors.
Pa
ge 24 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1