Vacuum Diaphragm For Boost Pressure Regulator Valve, Checking

Vacuum Diaphragm For Boost Pressure Regulator Valve, Checking

Test conditions
- Engine oil temperature at least 80 degrees C
- no leaks on intake or exhaust side

Test Sequence







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







- 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:
- Check Wastegate Bypass Regulator Valve N75 (throughput in hose from turbocharger via valve to vacuum diaphragm with connector disconnected).

If Wastegate Bypass Regulator Valve N75 is OK:
- Replace turbocharger.