Which technician is correct about shift softness related to throttle percentage in ATEC and CEC systems?

Which technician is correct about shift softness related to throttle percentage in ATEC and CEC systems?

• A. Technician A
• B. Technician B
• C. Both Technician A and Technician B
• D. Neither Technician A nor Technician B

Answer: (B)

Shift softness is controlled by how the transmission control uses engine load signals to modulate clutch engagement and hydraulic pressure during a gear change. The throttle percentage is a direct indicator of engine load, and in many CEC (controlled Electronic Control) systems this throttle input is a primary factor in deciding how smooth or firm a shift should be. When the throttle is eased, the system softens the shift to avoid torque surges; when throttle is high, shifts tend to be quicker and can feel firmer to deliver power promptly. Technician B’s view aligns with how CEC shift control typically uses throttle input to adjust shift softness, which is why this answer is correct. ATEC systems often rely on different control strategies (torque-based or other signals) and don’t rely on throttle percentage in the same way for shift softness, which is why the statement about throttle-based softness being the controlling factor points to Technician B.

Shift softness is controlled by how the transmission control uses engine load signals to modulate clutch engagement and hydraulic pressure during a gear change. The throttle percentage is a direct indicator of engine load, and in many CEC (controlled Electronic Control) systems this throttle input is a primary factor in deciding how smooth or firm a shift should be. When the throttle is eased, the system softens the shift to avoid torque surges; when throttle is high, shifts tend to be quicker and can feel firmer to deliver power promptly.

Technician B’s view aligns with how CEC shift control typically uses throttle input to adjust shift softness, which is why this answer is correct. ATEC systems often rely on different control strategies (torque-based or other signals) and don’t rely on throttle percentage in the same way for shift softness, which is why the statement about throttle-based softness being the controlling factor points to Technician B.