Leak Detection Pump, Checking Vacuum Supply

WARNING: This page is about a different car, the 2009 Volkswagen GTI and 2008 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Turbocharger Tester -V.A.G 1397A-
T-piece -251 201 346-
6 mm Diameter Hose

NOTE:

Leak detection pump -V144- installed location:

GTI: In the right rear wheel housing under the wheel housing liner.

Eos: behind the right rear wheel.

GTI

-- Remove the right rear wheel and wheel housing liner.

-- Disconnect the vacuum line -1- from the leak detection pump.

Fig 1: Identifying Turbocharger Tester V.A.G 1397A With T-Piece And 6 mm Dia. Hose

Courtesy of VOLKSWAGEN UNITED STATES, INC.

-- Connect the turbocharger tester -V.A.G 1397A- with the T-piece and 6 mm diameter hose between the vacuum line -1- and the leak detection pump -2-.

Eos

-- Disconnect the vacuum line -1- from the leak detection pump.

Fig 2: Identifying Turbocharger Tester V.A.G 1397A With T-Piece And 6 mm Dia. Hose

Courtesy of VOLKSWAGEN UNITED STATES, INC.

-- Connect the turbocharger tester -V.A.G 1397A- with the T-piece and 6 mm diameter hose between the vacuum line -1- and the leak detection pump -2-.

Continuation for all Vehicles

-- Turn on measuring range I (absolute pressure measurement).

-- Connect the vehicle diagnostic tester and start the engine.

-- Select Guided Functions on the vehicle diagnostic tester.

-- Select the "Check tank ventilation system for leaks" guided function.

-- Activate the test.

-- While the test is running, observe the display on the turbocharger tester -V.A.G 1397A-.

The pressure must pulsate and must not rise above 0.700 bar (absolute pressure) during the test.

-- If the pressure rises above 0.700 bar during the test, the vacuum supply is too low. Check the vacuum line to the intake manifold for kinks or blockages.