Prizm L4-1800cc 1.8L DOHC (1993)
EGR Control Solenoid: Description and Operation
EGR Solenoid Vacuum (SV) Valve (California Emissions Only)
The Exhaust Gas Recirculation (EGR) system is controlled by the PCM through an EGR Electronic Vacuum Regulating Solenoid Valve (EVRV) and
backpressure transducer. Vacuum is allowed to the EGR valve at acceleration and shut "OFF" upon deceleration or constant engine speed.
Under any one of the following conditions, the PCM closes the vacuum passage of the EGR EVRV. in this state, as vacuum is not transmitted to the
EGR valve, it remains closed.
^ When engine coolant temperature is low.
^ When throttle valve is at idle position.
^ When engine is running under high load.
Other than the above, EGR valve opens and closes in accordance with EGR backpressure transducer operation.
