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 requirements
- Coolant temperature must be at least 80 degrees C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. Diagnostic Mode 1: Check Measured Values
- 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. 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:
- Replace turbocharger, item no. 6
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- Check DTC memory.