Volkswagen Touareg (2003 year). Manual — part 33
❑ For leak detection in fuel system
❑ For checking fuel system diagnosis pump -V144- .
4.2.2
Checking build-up of pressure of fuel
system diagnostic pump -V144-
Test prerequisite:
• Fuel system tester -KLI 9210- is connected to vehicle via
adapter hose -KLI 9210/55-2- .
• Valve -D- is set to „Hold“.
• Diagnostic mode 8 is completed and engine is running at idling
speed.
Fuel system must not be under pressure for test. Proceed as fol‐
lows to reduce residual pressure:
– Briefly open quick-release coupling -arrow- for adapter hose -
KLI 9210/55-2- to release pressure in fuel system. Pressure
gauge -D- must drop to 0 in. H2O.
– On vehicle system tester, select operating mode
Guided
functions
.
– Select guided function „Checking tank ventilation system for
leaks“.
– Initiate test.
– Observe pressure gauge while test is running.
– Fuel system diagnostic pump -V144- must pump up pressure
in fuel system at least to 18 mbar (7 in. H2O).
– If pressure is not reached, check vacuum supply of fuel system
– If fuel system is free of leaks and vacuum supply of fuel system
diagnostic pump -V144- is OK, renew fuel system diagnostic
pump -V144- .
4.2.3
Checking vacuum supply of fuel system
diagnostic pump -V144-
Special tools and workshop equipment required
Touareg 2003 ➤
4. Activated charcoal filter system (vehicles for USA and Canada)
129
♦ T piece -251 201 346-
♦ Hose ∅ 6 mm
Note
Fitting location of fuel system diagnosis pump -V144- : in rear right
wheel housing under wheel housing liner.
– Remove rear right wheel and wheel housing liner.
– Remove securing bolts
of activated
charcoal filter and lower filter to have better access to vacuum
line.
Caution
Support activated charcoal filter to prevent its hanging down
from hoses and lines. This prevents damages.
– Disconnect vacuum line -1- from fuel system diagnostic pump
-V144- .
– Connect turbocharger tester -V.A.G 1397A- with T-piece and
hose ∅ 6mm, between vacuum line -1- and fuel system diag‐
nostic pump -V144- -2-.
– Switch on measuring range
I
(absolute pressure measure‐
ment).
– Connect vehicle diagnosis tester and start engine.
– On vehicle diagnosis tester, select operating mode
Guided
functions
.
– Select guided function „Checking tank ventilation system for
leaks“.
– Observe display on turbocharger tester -V.A.G 1397A- while
test is running.
• Pressure must pulsate and must not exceed 0.700 bar during
test.
– If pressure exceeds 0.7 bar during test, vacuum supply is too
low. Check vacuum line to intake manifold for possible kinks
or blockages.
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130
1
Repairing injection system
General notes on injection
♦ Fuel hoses in engine compartment must be secured only with
spring-type clips. The use of clamp or screw-type clips is not
permissible.
♦ For trouble-free operation of electrical components, a voltage
of at least 11.5 V is necessary.
Safety precautions
.
Rules for cleanliness
.
.
Assembly overview - intake manifold
.
Assembly overview - fuel rail
Assembly overview - air filter
Assembly overview - vacuum hose assembly on intake manifold
Touareg 2003 ➤
1. Repairing injection system
131
Assembly overview - intake manifold
1 - Variable intake manifold
2 - To activated charcoal filter
solenoid valve 1 -N80-
3 - Sealing cap
4 - Vacuum connection
5 - Gasket
6 - To brake servo.
7 - Throttle valve module -
J338-
❑ Gold-plated connector
contacts
❑ If renewed, adapt en‐
gine control unit to throt‐
tle valve module ⇒ Ve‐
hicle diagnostic tester; ;
„Guided functions“ .
8 - 10 Nm
9 - Crankcase breather valve
10 - Connecting hose
11 - Connecting pipe
12 - 10 Nm
13 - 10 Nm
14 - Clip
15 - Connection
❑ For crankcase ventila‐
tion.
16 - Dowel cone
❑ Fit gasket before instal‐
lation.
17 - Dowel pin, 3 Nm
18 - 10 Nm
❑ To secure intake manifold.
❑ 7 securing bolts on each side
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