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

NOTE: Leak Detection Pump (LDP) V144 component location Under wheel housing liner in right rear wheel housing.

- Remove right rear wheel and wheel housing liner.







- Remove vacuum line - 1 - from Leak Detection Pump (LDP) V144.
- Connect Turbocharger Tester V.A.G 1397A with the 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.
- Activate test.
- 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 (absolute pressure) during the test.
- If 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.