3-Way Solenoid
- Remove vacuum sensing tube from servo diaphragm. Remove intake manifold vacuum tube from 3-way solenoid. Detach wire from 3-way solenoid which comes from engine speed switch. Ground 3-way solenoid at disconnected terminal using jumper wire.
- Turn ignition switch "ON" (engine off). Blow air through vacuum hose disconnected from servo diaphragm and note that air should come out 3-way solenoid filter (cap can be removed for easier checking).
- Turn ignition switch "OFF". Blow air into same vacuum tube and note that air should now come from intake manifold nipple. If valve does not function as described, replace 3-way solenoid.
Courtesy of MAZDA MOTORS CORP.