Vacuum diaphragm for boost pressure regulator valve, checking

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Special tools, testers and auxiliary items required

Fault Read Out Device V.A.G 1551 or Vehicle Diagnosis, Testing and Information System VAS 5051B

Test conditions

Engine oil temperature at least 60 ° C
No leaks on intake or exhaust side.

Test sequence

Fig 1: Identifying Connector At Wastegate Bypass Regulator Valve N75

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect connector - 2 - at Wastegate Bypass Regulator Valve N75 - 1 -.

Fig 2: Boost Pressure Regulator Valve And Actuator Rod

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Start engine and increase speed to maximum RPM by depressing accelerator pedal suddenly. Actuator rod - 2 - for boost pressure regulator valve must move.

If actuator rod does not move:

Check lever for boost pressure regulator valve - 1 - for ease of movement. If rusted in place, replace turbocharger.

If actuator rod does not move through light prying:

Exhaust turbocharger faulty, replace it, refer to Turbocharger with attachments, assembly overview .
Check DTC memory.
Read readiness code.
If DTC memory was cleared or engine control module disconnected from voltage supply, readiness code must be regenerated.