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2. Vacuum modulator - Wikipedia

   en.wikipedia.org/wiki/Vacuum_modulator

   Vacuum Modulator is an engine load sensing device that converts engine vacuum into a transmission valve body input. Most vacuum modulators operate with manifold vacuum (below throttle blades) that offer more vacuum at idle, and proportionately changes (rises and falls) with engine load as opposed to operating on engine speed.

3. Transmission control unit - Wikipedia

   en.wikipedia.org/wiki/Transmission_Control_Unit

   A transmission control unit (TCU), also known as a transmission control module (TCM), or a gearbox control unit (GCU), is a type of automotive ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely for clutch automation and actuation.

4. Electronic control unit - Wikipedia

   en.wikipedia.org/wiki/Electronic_control_unit

   Electric power steering control unit (PSCU) – Generally this will be integrated into the EPS power pack. Human–machine interface (HMI) Powertrain control module (PCM) – Sometimes the functions of the engine control unit and transmission control module (TCM) are combined into a single unit called the Powertrain Control Module. Seat control ...

5. Automatic transmission - Wikipedia

   en.wikipedia.org/wiki/Automatic_transmission

   Electronics began to be more commonly used to control the transmission, replacing mechanical control methods such as spring-loaded valves in the valve body. Most systems use solenoids which are controlled by either the engine control unit, or a separate transmission control unit. This allows for more precise control of shift points, shift ...

6. GM recalls nearly 500,000 pickup trucks and SUVs. Here's what ...

   www.aol.com/gm-recalls-nearly-500-000-160625464.html

   General Motors on Wednesday said it is recalling nearly 462,000 diesel-engine SUVs and pickup trucks in the U.S. because of a faulty transmission control valve that may fail and cause the rear ...

7. Desmodromic valve - Wikipedia

   en.wikipedia.org/wiki/Desmodromic_valve

   A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring. The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust spent gases at the end of the cycle.