ECU:

Zone Correction

To maintain the most desirable air/fuel ratio thoughout the entire driving range, the driving range is divided into several zones based on engine speed, intake manifold pressure, and throttle position. Appropriate corrections are made in each zone.

Fuel	Zone	Operation	Remark
Decrease	Fuel-cut (F&R rotor)	Fuel supply is stopped during full-closed throttle deceleration	Improves drive feel and fuel efficency
Decrease	Fuel-cut (Front rotor)	Fuel to front rotor is cut during half-throttle deceleration	Prevents bucking
Increase	Light-load	Fuel amount increased	Ensures engine smoothness
Increase	Low-speed	Fuel amount increased	Ensures engine smoothness
Increase	Low-speed with Heavy-load	Fuel amount increased	Ensures engine smoothness
Increase	High-speed	Fuel amount increased	Ensures engine smoothness
Increase	Heavy-load	Fuel amount increased	Ensures engine smoothness
Increase	Boost	Fuel amount increased	Ensures engine smoothness
Increase	Idle	Fuel amount increased coresponing to the applied load	Ensures engine smoothness
Feedback	Feedback	During constant-speed driving, feedback control is performed based on O2 sensor	Improves exhaust gas cleansing