CAC Gasoline Engine Maintenance And Servicing Manual
84
2.2 Lower body(air system)—description and function of accessories
Excepted that connecting throttle valve to accelerator pedal by a lever, the following parts should be
installed on the lower body.
·throttle valve position sensor
·stepper motor
·hot water loop near the throttle valve and idle air by-pass
·absolute pressure signal port in the lower throttle valve (necessary to be connected with pressure
sensor)
·PCV recirculation pipe
——throttle valve position sensor “PF2C”.
figure 140 shows the position sensor case structure ,also the relationship between output characteristic,
output signal and throttle valve opening ange.
·Sensor component is consisted of a potentiometer. The slipping ruler of potentiometer is driven directly
by accelerator pedal which is proportional with throttle valve opening.
·the potentiometer is inserted into plastic case with two baffles on the bracket. There are two
Fig.139 temperature sensor and principle
water
Air
Connecting chart
Fig. 140 throttle valve position sensor and operation chart
ground
Signal output
power
throttle valve opening(angle)
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