Voyager L4-153 2.5L SOHC (1990)
Cruise Control Servo: Component Locations
Individual Solenoid Functions
This electro-mechanical device contains three solenoid valves that control
vacuum in the diaphragm chamber, pulling the cable and thereby the throttle.
The individual solenoid functions are:
Vacuum valve: When energized the valve allows vacuum into the diaphragm
chamber. When not energized, the valve is spring-loaded to prevent vacuum from
entering the diaphragm chamber.
Vent valve: When energized, this valve prevents vacuum from bleeding off; thereby allowing speed control function. When not energized, the valve i
spring-loaded open to bleed off vacuum.
Safety valve: This valve functions like the vent valve, but its vacuum bleed is larger.
Power for all the solenoids is supplied through the ON/OFF and brake switch
with one wire. Both the vacuum and vent solenoids are grounded by the engine
controller to operate speed control. The Safety valve is always grounded.
Speed Control Servo