Solenoid Control Switch

This switch is located at the transmission. It opens or closes in relation to vehicle speed (auto, trans.), or gear range (man. trans.). On auto, trans, the switch is operated by transmission oil pressure, on man. trans, it is operated by shifter shaft. At speeds above 36 MPH (auto, trans.), or in high gear (man. trans.), the switch opens and breaks ground circuit to solenoid vacuum valve. At speeds under 36 MPH (auto, trans.) or in lower gear ranges (man. trans.) the switch closes and completes the ground circuit to the solenoid vacuum valve.