AIR13 - Check For Vacuum at AIRD Valve

NOTE: This test step will require your attention to time.

^ Key OFF.

^ Remove vacuum line from air supply control line.

^ Key ON, engine RUNNING at normal operating temperature.

^ After engine has started, immediately check for vacuum.

^ Was vacuum present at start?

YES -- Go to AIR14. AIR14 - Check For Vacuum to Drop

NO -- Go to AIR27 to verify solenoid AIRD vacuum function. AIR27 - Check Air Solenoid