VW CMTA - Page 216

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– Connect vehicle diagnostic tester to vehicle.
– Start engine and run at idling speed.
– On vehicle diagnostic tester, select operating mode Guided
functions .
– Select guided function “Checking tank ventilation system for
leaks”.
– Initiate test.
– Observe pressure gauge - KLI 9210- while test is running.
• Fuel system diagnostic pump - V144- must pump up pressure
in fuel system to at least 7 in. H2O (17 mbar).
The minimum pressure was not reached, but the available pres‐
sure does not drop.
– Switch off ignition and perform a pressure retention test
⇒ page 210 . If no pressure drop can be detected: Check
vacuum supply of fuel system diagnostic pump - V144-
⇒ page 213 .
The minimum pressure was not reached and the available pres‐
sure drops immediately:
– Clamp off hose to activated charcoal filter solenoid valve 1 -
N80- using a hose clip -arrow-.
– Repeat check. If the minimum pressure is reached now, renew
activated charcoal filter solenoid valve 1 - N80- .
If the minimum pressure was again not reached and the available
pressure drops immediately:
– Leak in fuel system. Perform “leak detection in fuel system”
⇒ page 211 .
Switch off ignition if the minimum pressure is reached.
The valve in the fuel system diagnostic pump - V144- closes and
the pressure is retained.
– Observe pressure gauge:
If the pressure does not drop at first, perform a pressure retention
test to localise any potential small leaks ⇒ page 210 .
If the pressure drops, clamp off hose to activated charcoal filter
solenoid valve 1 - N80- using a hose clip -arrow-.
– If the pressure does not drop again, renew activated charcoal
filter solenoid valve 1 - N80- .
If the pressure still drops, perform “leak detection in fuel system”
⇒ page 211 .
Pressure retention test
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
210 Rep. gr.20 - Fuel supply system