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Home >> Isuzu >> 1988 >> Pickup Base, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Closed Loop Emission System >> Operation >> Electronic Control Module >> Notes

Electronic Control Module: Notes

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The ECM controls all functions of the closed loop system. The ECM sends an electrical signal to the vacuum control or duty solenoid. This control signal is constantly cycling the solenoid on and off (duty cycle) as a function of the input voltages from the system sensors. The control signal generated by the ECM is selected from 4 operational modes.