Camry Sedan 2WD V6-2507cc 2.5L DOHC (2VZ-FE) (1990)
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Throttle Positioner (TP): Description and Operation
Fig. 27 Dash Pot System
Fig. 28 Dash Pot Schematic
On vehicles with manual transmissions, the Dash Pot reduces Hydrocarbons (HC) and Carbon Monoxide emissions by returning the throttle plate slowly
to the idle position during deceleration. This allows the air fuel mixture to burn more completely than if the throttle were closed abruptly. The Dash Pot
consists of a spring loaded diaphragm that extends when the throttle is opened, thus drawing in air through suction. The air becomes trapped by the
vacuum transmitting valve (VTV) and becomes a buffer on the diaphragm. When the throttle valve is released and comes in contact with the DP actuator
pin, the air is forced back out of the DP filter slowly, returning the throttle valve slowly to its idle position.
