In ATEC and CEC systems, which component serves as an accumulator to smooth the shift process?

In ATEC and CEC systems, which component serves as an accumulator to smooth the shift process?

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

Answer: (C)

In ATEC and CEC systems, smooth shifting is achieved by using a hydraulic accumulator built into the shift circuit—the trimmer. The trimmer stores a small amount of hydraulic fluid and, with a controlled spring action, releases it gradually as a shift is initiated. This dampens the pressure spike that would otherwise occur when the next clutch is engaged, softening the shift feel and reducing shock. The other components have different primary roles: the torque lock-up relay valve controls the torque converter clutch, the main pressure regulator valve sets the overall system pressure, and the non-latching solenoid actuates the shift valve without providing the buffering effect needed to smooth the shift.

In ATEC and CEC systems, smooth shifting is achieved by using a hydraulic accumulator built into the shift circuit—the trimmer. The trimmer stores a small amount of hydraulic fluid and, with a controlled spring action, releases it gradually as a shift is initiated. This dampens the pressure spike that would otherwise occur when the next clutch is engaged, softening the shift feel and reducing shock.

The other components have different primary roles: the torque lock-up relay valve controls the torque converter clutch, the main pressure regulator valve sets the overall system pressure, and the non-latching solenoid actuates the shift valve without providing the buffering effect needed to smooth the shift.