AIS15 - Check For Vacuum Signal at IMRC Solenoid Outlet Port

^ Disconnect IMRC solenoid outlet vacuum hose (top port) only.

^ Connect a vacuum gauge to the solenoid outlet port.

^ Note vacuum gauge reading as engine rpm is increased to 3500 rpm.

^ Did gauge show vacuum at low rpm and no vacuum at high rpm?

YES -- Turn engine off and Reconnect IMRC solenoid outlet vacuum hose. Go to AIS16. AIS16 - Check For Vacuum Signal at IMRC Actuator Inlet Port

NO -- Turn engine off. Go to AIS2O. AIS20 - IMRC Solenoid Functional Check