Leak Detection Pump, Checking Vacuum Supply

Leak Detection Pump, Checking Vacuum Supply

Special tools, testers and auxiliary items required

• Turbocharger tester (VAG 1397A)

• Vehicle diagnosis, testing and information system (VAS 5051B)

• T fitting (251 201 346)

• 6 mm diameter hose

Test Sequence

- Read the safety precautions before beginning work. Refer to --> [ Safety Precautions ] .

- Observe the rules for cleanliness. Refer to --> [ Clean Working Conditions ] .

- Remove the right rear wheel.

- Remove the right rear wheel housing liner.

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





- Connect the (VAG 1397A), T fitting and the 6 mm diameter hose between the vacuum line - 1 - and the LDP - 2 -.

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

- Connect the (VAS 5051B) - 1 - as follows:





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

- Start engine and run at idle speed.

- Select the operating mode Guided Functions on the (VAS 5051B).

- Select "Guided Function" Check tank ventilation system for leaks.

- Activate the test.

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