Leak Detection Pump, Checking Vacuum Supply

WARNING: This page is about a different car, the 2008 Volkswagen Jetta, 2008 Volkswagen GLI, 2007 Volkswagen Jetta, and 2006 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Turbocharger tester VAG 1397A
T piece 251 201 346
6 mm diameter hose

NOTE:

Leak Detection Pump (LDP) installation location:

Under the wheel housing liner in the right rear wheel housing.

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

-- Remove the vacuum line -1- from the LDP.

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

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the VAG 1397A with the T piece and 6 mm diameter hose between the vacuum line -1- and the LDP -2-.

-- Switch on the measuring range I (absolute pressure measurement).

-- Connect the vehicle diagnosis, testing and information system and start the engine.

-- Select the Guided Functions operating mode on the vehicle diagnosis, testing and information system.

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

-- Activate the test.

-- While the test is running, observe the display on VAG 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 vacuum line to intake manifold for kinks or blockages.