What is the purpose of a governor on a transmission?
The governor is a clever valve that tells the transmission how fast the car is going. It is connected to the output, so the faster the car moves, the faster the governor spins.
What’s a transmission governor?
The transmission governor on a 700R4 is used to regulate the speed at which the transmission shifts into the next higher or lower gear. It accomplishes this through the use of two sets of centrifugal weights, each a different weight.
What replaces a governor in a transmission?
This valve has been replaced in electronic transmissions by the (VSS) Vehicle Speed Sensor.
How does a car act when the transmission is going out?
Clunking, humming or whining sounds are signs of automatic transmission problems. Faulty manual transmissions will also give off loud machinelike sounds that seem to come out of nowhere. A clunking noise when you shift gears is a telltale transmission situation.
How does a transmission throttle valve work?
The transmission throttle, a mechanism that manages the flow of fluid, contains a butterfly valve. This valve opens or closes to either allow or obstruct the passage of air or fluid and converts line pressure, which is directed to valves in the transmission.
What are the symptoms of a bad governor pressure solenoid?
Common symptoms/transmission problems associated with a bad governor pressure sensor include, poor downshift timing, hanging in 3rd or 2nd gear on down shifts, delayed upshifts, hanging in 1st or 2nd gear on upshifts, 3rd gear limp mode.
How is the governor valve in a transmission changed?
The output shaft drives the governor valve. As the shaft spins, a set of weights move the valve with centrifugal force changing governor pressure. This valve has been replaced in electronic transmissions by the (VSS) Vehicle Speed Sensor.
How does the Governor affect the shift timing?
Governor pressure increases with vehicle speed. Older transmissions had mechanical governors that consisted of springs, centrifugal weights, and a spool valve to control this pressure. Governor pressure causes a transmission to upshift, and throttle pressure causes it to downshift. Today’s transmissions use solenoids for the shift timing.
Why does governor pressure increase with vehicle speed?
Governor pressure increases with vehicle speed. Older transmissions had mechanical governors that consisted of springs, centrifugal weights, and a spool valve to control this pressure. Governor pressure causes a transmission to upshift, and throttle pressure causes it to downshift.
How does the governor valve work in a TCM?
The output shaft drives the governor valve. As the shaft spins a set of weights moves the valve with centrifugal force. This varies governor pressure. This valve has been replaced in electronic transmissions by the (VSS) or vehicle speed sensor. The VSS inputs vehicle speed to the TCM.