300E (124.026) L6-2.6L (103.940) (1990)
Throttle Full Close Switch: Description and Operation
Component Locations
The throttle microswitch is mounted on the intake manifold. The microwitch is supplied by the ECU with a constant voltage signal (approx. 8 volts).
Under deceleration, the circuit to the ECU is closed by the microswitch. When the ECU receives a closed circuit signal from the microswitch and the
engine is above 900 RPM (normal operating temperature) fuel supply is cut-off by the action of the electro-hydraulic actuator, i.e. deceleration fuel
cut-off. The result is less fuel consumption and lower over-all emissions. The speed at which deceleration cut-off occurs depends on coolant
temperature; The lower the coolant temperature, the higher the speed at which restart of fuel injection begins.