Leak Detection Pump Vacuum Supply, Checking

Leak Detection Pump Vacuum Supply, Checking

Special tools, testers and auxiliary items required

• Turbocharger tester (V.A.G 1397A)

• T-piece (251 201 346)

• Hose dia. 6 mm

• Leak Detection Pump (LDP) (V144) installation location Under wheel housing liner in right rear wheel housing.

- Remove right rear wheel and wheel housing liner.

- Loosen EVAP canister mounting bolts --> [ (Item 14) Screws ] and lower it so vacuum line is more easily accessible.

CAUTION!
Support EVAP canister so it does not hang by the hoses and lines. This prevents damage.

- Remove vacuum line - 1 - from Leak Detection Pump (LDP) (V144).





- Connect Turbocharger Tester (V.A.G 1397A) with T-piece and 6 mm dia. hose between vacuum line - 1 - and Leak Detection Pump (LDP) (V144) - 2 -.

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

- Connect vehicle tester and start engine.

- Select Guided Functions operating mode on vehicle diagnostic tester.

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

- While test is running, observe display on Turbocharger Tester (V.A.G 1397A).

• The pressure must pulsate and must not rise above 0.700 bar during test.

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