PL720 2WD L4-1952cc 2.0L SOHC (Z20) (1985)
Throttle Position Switch: Description and Operation
Full Throttle Vacuum Switch, Carbureted
Fig. 5 Full throttle vacuum switch
The full throttle vacuum switch, Fig. 5, senses low intake manifold vacuum and transmits a corresponding electric signal to the ECC control unit. The
vacuum switch turns on when intake manifold decreases around full throttle or under heavy load.