In ATEC and CEC systems, an accumulator used to smooth out the shift process is called what?

In ATEC and CEC systems, an accumulator used to smooth out the shift process is called what?

• A. torque lock-up relay valve
• B. main pressure regulator valve
• C. trimmer
• D. non-latching solenoid

Answer: (C)

In hydraulic shift control, shifts are smoothed by absorbing and moderating pressure changes with an accumulator. In ATEC and CEC systems, the device that performs this job is called a trimmer. The trimmer acts as a spring-loaded chamber that stores hydraulic energy and releases it gradually during gear engagement, softening the bite and preventing harsh shifts. This is why it’s the best answer—the term specifically describes the accumulator used to dampen the shift. The other components have different roles: a torque lock-up relay valve handles torque converter lockup, a main pressure regulator valve sets overall system pressure, and a non-latching solenoid is an actuator in the valve body—not the shift-damping accumulator.

In hydraulic shift control, shifts are smoothed by absorbing and moderating pressure changes with an accumulator. In ATEC and CEC systems, the device that performs this job is called a trimmer. The trimmer acts as a spring-loaded chamber that stores hydraulic energy and releases it gradually during gear engagement, softening the bite and preventing harsh shifts. This is why it’s the best answer—the term specifically describes the accumulator used to dampen the shift. The other components have different roles: a torque lock-up relay valve handles torque converter lockup, a main pressure regulator valve sets overall system pressure, and a non-latching solenoid is an actuator in the valve body—not the shift-damping accumulator.