Touareg V8-4.2L (AXQ) (2006)
Leak Detection Pump: Testing and Inspection
Leak Detection Pump Vacuum Supply, Checking
Leak Detection Pump Vacuum Supply, Checking
Special tools, testers and auxiliary items required
‹› Turbocharger tester (V.A.G 1397A)
‹› T-piece (251 201 346)
‹› Hose dia. 6 mm
‹› Leak Detection Pump (LDP) (V144) installation location Under wheel housing liner in right rear wheel housing.
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Remove right rear wheel and wheel housing liner.
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Loosen EVAP canister mounting bolts --> [ (Item 14) Screws ] See: Service and Repair/EVAP System, Assembly Overviewand lower it so
vacuum line is more easily accessible.
CAUTION!
Support EVAP canister so it does not hang by the hoses and lines. This prevents damage.
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Remove vacuum line - 1 - from Leak Detection Pump (LDP) (V144).
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Connect Turbocharger Tester (V.A.G 1397A) with T-piece and 6 mm dia. hose between vacuum line - 1 - and Leak Detection Pump (LDP)
(V144) - 2 -.
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Switch on measuring range I (absolute pressure measurement).
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Connect vehicle tester and start engine.
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Select Guided Functions operating mode on vehicle diagnostic tester.
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Select "Check tank ventilation system for leaks" guided function.
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While test is running, observe display on Turbocharger Tester (V.A.G 1397A).
‹› The pressure must pulsate and must not rise above 0.700 bar during test.
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If pressure rises above 0.700 bar during test, the vacuum supply is too low. Check vacuum line to intake manifold for kinks or blockages.