Wastegate Actuator: Testing and Inspection

Wastegate bypass regulator valve, checking
Special tools and equipment
^ VAG1526 multimeter or VAG1715 multimeter
^ VAG1594 connector test kit

Test requirement
^ Output Diagnostic Test Mode (DTM) performed

Test sequence
- Switch ignition off.
- Disconnect connector at solenoid valve for boost pressure regulation.





- Measure resistance between terminals of valve.
Specification: 25 to 35 Ohms
If specified value is not obtained:
- Replace wastegate bypass regulator valve -N75-.

Vacuum diaphragm for wastegate bypass regulator valve, checking
Special tools and equipment
VAG 1551 scan tool (or VAG 1552 mobile scan tool) with VAG1551/3 cable

Test requirement
^ Engine oil temperature at least 80°C

Test sequence





- Disconnect connector -2-at wastegate bypass regulator valve -N75-.





- Bring engine to maximum RPM by depressing accelerator pedal suddenly. Operating rod -2- for wastegate bypass regulator valve must move.
If operating rod does not move:
- Check lever for wastegate bypass regulator valve -1- for ease of movement.
If rusted solid, replace turbocharger.
If operating rod does not move despite freely moving lever:
- Check wastegate bypass regulator valve -N75-. (Throughput in hose from turbocharger via valve to vacuum diaphragm with connector disconnected)
If solenoid valve is OK:
- Replace turbocharger, refer to Turbocharger.