Leak Detection Pump, Checking Vacuum Supply

WARNING: This page is about a different car, the 2009 Volkswagen Rabbit, 2008 Volkswagen Rabbit, 2007 Volkswagen Rabbit, and 2006 Volkswagen Rabbit. 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 1397 A
T-connection 251 201 346
6 mm Diameter Hose

NOTE:

Leak detection pump -V144- installed location:

Under the liner in the right rear wheel housing.

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

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

Fig 1: Connecting Turbocharger Tester V.A.G 1397A With T-Piece And 6 mm Dia. Hose Between Vacuum Line And Leak Detection Pump (LDP) V144

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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

-- 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 "Check tank ventilation system for leaks".

-- Start the test.

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

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.