Colt L4-089 1468cc 1.5L VIN K 2-bbl (1988)
Idle Up Control Valve: Description and Operation
Throttle Opener/Idle-Up/Dash Pot Operation
Throttle Opening System (Throttle Opener Solenoid For A/C)
THROTTLE OPENING (FOR A/C)
When the engine speed is below the set speed (1,200 rpm), the ECU provides a ground to the throttle opener solenoid valve . When the air conditioner
relay is turned on the throttle opener solenoid valve is energized to introduce intake manifold vacuum to the throttle opener. The throttle valve opens
slightly preventing engine speed drop caused by air conditioner load.
Throttle Opening System
IDLE-UP (FOR ELECTRICAL LOAD)
When the engine speed drops below the set speed (1,200 rpm), the ECU provides a ground to the idle-up solenoid valve. When the electrical switch is
turned on for lighting (tail light switch) or the blower fan (fan only, heater or defroster), the idle-up solenoid valve is energized. This allows intake
manifold vacuum to the idle-up Actuator to open the throttle valve slightly, preventing engine speed drop caused by electrical load. In addition,
independently from the ECU, if the power steering oil pressure switch is activated (indicating a load) the idle-up control solenoid valve is energized to
