AIR33 - Check Air Flow at Check Valve

Vacuum Check Valve:

^ Key OFF.

^ Remove check valve from vacuum lines (note which direction check valve is installed).

^ Connect auxiliary vacuum source to black side of check valve.

^ Connect vacuum gauge to opposite side of check valve.

^ Apply 54 kPa (16 in Hg) vacuum to black side.

^ Does gauge indicate 54 kPa (16 in Hg)?

YES -- Go to AIR34. AIR34 - Verify Check Valve's Ability to Hold Vacuum

NO -- Replace check valve. Verify drive concern.