Idle-Up System

The ECM sends an electrical signal to the 3-way Solenoid Valve (TWSV). Upon receiving the signal, the TWSV opens its inner valve and transmits manifold vacuum to idle-up diaphragm. The vacuum causes the diaphragm to move down, which causes the idle-up adjusting screw and rod to also move down. The rod opens the throttle valve and produces the idle-up state.

The idle-up system increases engine idle speed under the following conditions: for about 5 seconds after warm engine is started; for about 3 seconds after deceleration when engine is warm; when oxygen sensor temperature is low or sensor is not satisfactorily activated; and under electrical loads for lights, coolant fan, rear defogger and heater fan.