FD3S:ECU Mapping

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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.

ECU Zone Control

Zone Correction

Fuel Zone Operation Remark
Decrease Fuel-cut (F&R rotor) Fuel supply is cut 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 - 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 Open-loop mode during constant-speed driving Improves exhaust gas cleansing

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