![]() ![]() The other is the modulator pressure which is affected by intake manifold vacuum or throttle position. One is the governor pressure which is affected by vehicle speed. On older transmissions there are two pressures that control the shift valves. Shift timing is regulated through sensor feedback information provided to the electronic controller. The shift solenoids are regulated by an electronic control module. Most automatic transmissions are electronically controlled electrical solenoids are used to control the hydraulic fluid. ![]() There is generally a manual shift valve, which is operated by the transmission selector lever, and a shift valve for each up shift the transmission provides. ![]() This fluid is channeled to the various servos through the shift valves. The hydraulic pressure used to operate the servos comes from the main transmission oil pump. Understanding the Hydraulic Control System The sensor for speed may be tripping or not tripping causing the overdrive to engage or disengage at a particular speed. ![]()
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