Storm L4-1600cc 1.6L SOHC (1990)
EGR Electronic Vacuum Regulator Solenoid: Description and Operation
EGR Valve Circuit
The Exhaust Gas Recirculation (EGR) vacuum control has a vacuum control solenoid that uses "Pulse Width Modulation" (PWM). This means that the
ECM turns the solenoid "OFF" and "ON" many times a second and varies the amount of "ON" time (pulse width) to vary the amount ported manifold
vacuum to the EGR valve.