What can throttle pressure be used for in automatic transmissions?

What is the purpose of using a governor in an automatic transmission?

They provide the inputs that tell the transmission when to shift. The Governor is connected to the output shaft and regulates hydraulic pressure based on vehicle speed. Of course, vehicle speed is not the only thing that controls when a transmission should shift, the load that the engine is under is also important.

What does a transmission throttle valve do?

Definition. 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 does line pressure do in a transmission?

The pressure generated by the oil pump is channeled to mainline, governor, and throttle pressure valves to control and lubricate the transmission. Some of these have been replaced or work together with electronic controls. Governor pressure increases with vehicle speed.

What is line pressure in automatic transmission?

The automatic transmission line pressure control system comprises a line pressure regulating means for regulating line pressure for selectively coupling and uncoupling the friction coupling elements so as to shift the automatic transmission into desired speed gears.

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Which gear needs higher line pressure and the modulator throttle valve pressure are not used?

Which gear needs higher line pressure, and the modulator/throttle valve pressure are not used? Reverse. If an automatic transmission only had a governor, and no throttle valve or vacuum modulator, what is the shift most likely to be like? It would shift at the same point no matter what the engine load is.

What does a transmission governor pressure solenoid do?

► What Exactly Does a Pressure control Solenoid do? The transmission pressure control solenoid controls the fluid pressure to the internal friction plate clutches or drum bands. A bad or failing transmission pressure control solenoid can cause slipping, which can result in the transmission overheating.

Does throttle cable affect transmission?

The throttle valve cable is used to control the line pressure, downshifting and the feel of the shifting. When the throttle valve cable is out of specification, the transmission can shift early, shift late or not shift at all.

Can throttle body cause transmission problems?

The Throttle Position sensor measures the throttle position, which is controlled by the gas pedal. It is used to determine engine load and if it fails it can cause automatic transmission shifting problems. When a throttle body is not functioning correctly, some noticeable characteristics may be poor or very low idle.

Are automatic transmission lines under pressure?

there is at idle between 20-50 psi… but during use pressures in transmission lines can reach 100 psi or more. if you are going to use rubber lines be sure to use barbed fittings so the hose does not blow off. hot transmission fluid blowing out and getting on a really hot exhaust manifold will cause instant fires.

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What should transmission pressure be?

Place the transmission in forward position and operate the transmission to 600 RPM. The pressure should read 40 to 70 psi.

What causes low pressure in automatic transmission?

Insufficient transmission fluid levels due to leaks in the system. Slipping or otherwise malfunctioning transmission. Malfunctioning transmission high pressure pump. Defective transmission temperature sensor.