Leak Detection Pump -V144- VACUUM SUPPLY, CHECKING

WARNING: This page is about a different car, the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2009 Volkswagen GLI, 2008 Volkswagen Jetta, and 2008 Volkswagen GLI. 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
Vehicle Diagnostic Tester
T Connection 251 201 346
6 mm Diameter Hose

-- Read the safety precautions before starting. Refer to SAFETY PRECAUTIONS .

-- Pay attention to the rules of cleanliness. Refer to CLEAN WORKING CONDITIONS .

-- Remove the right rear wheel.

-- Remove the right rear wheel housing liner. Refer to Removal and Installation .

-- Disconnect the vacuum line -1- from the Leak Detection Pump (LDP).

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 LDP -2-.

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

-- Connect the vehicle diagnostic tester -1- as follows:

Fig 2: Connecting Evaporative Emissions Tester To Vehicle

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the diagnostic cable -2- to the Data Link Connector (DLC) in the driver foot well.

-- Start the engine and run at idle speed.

-- Select Guided Functions on the vehicle diagnostic tester.

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

-- Start the test.

-- While the test is running, observe the display on 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 vacuum pump for kinks or blockages.