If simulation function of M-MDS is not used:
- Inspect variable swirl solenoid valve.
- If the variable swirl solenoid valve is not normal, replace the variable swirl solenoid valve.
- If the variable swirl solenoid valve is normal, inspect the following:
- Vacuum hose and vacuum chamber for looseness or damage
- Shutter valve actuator
- Check valve is stuck open or closed
- Shutter valve cannot move smoothly