In contrast to a conventional throttle which used accelerator pedal effort to determine throttle angle, the FA20D engine had electronic throttle control which used the ECM to calculate the optimal throttle valve angle and a throttle control motor to control the angle.
The four valves per cylinder — two intake and two exhaust — were actuated by roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms which actuated the valves.
Furthermore, the electronically controlled throttle regulated idle speed, traction control, stability control and cruise control functions.
Pressed by hydraulic pressure from the oil pump, the detent oil passage would become blocked so that it did not operate.
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According to Toyota, port and direct injection increased performance across the revolution range compared with a port-only injection engine, increasing power by up to 10 kW and torque by up to 20 Nm.