Leak Detection Pump, Checking Vacuum Supply

WARNING: This page is about a different variant/trim than selected.

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 right rear wheel housing liner.

-- 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

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

-- 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.

-- Vehicles through MY 09: make sure that the vacuum line leading to the intake manifold is not bent or plugged.

-- Vehicles from MY 10: make sure the vacuum line for the connection to the vacuum line between the vacuum pump and brake booster is not bent or plugged.