TT Quattro Coupe L4-1.8L Turbo (AWP) (2001)
Air Bypass Valve: Testing and Inspection
With Generic Scan Tool
Vacuum Diaphragm For Wastegate Bypass Regulator Valve, Checking
Recommended special tools and equipment e.g.:
-
VAG1526 multimeter or VAG1715 multimeter
-
VAG1594 connector test kit
Test requirement
-
Engine oil temperature at least 80 degree C.
Test sequence
-
Disconnect connector at Wastegate Bypass Regulator Valve -N75-(-1-).
-
Start engine and increase speed 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, item no 8.