EGR Electronic Vacuum Regulator Solenoid: Description and Operation

EGR System:

Top Of Engine:

PURPOSE
The ECM controlled Electronic Vacuum Regulator Valve (EVRV) solenoid is used in the vacuum line to regulate EGR flow.

OPERATION
The EGR vacuum control has an EVRV solenoid that uses Pulse Width Modulation (PWM). This means the ECM turns the solenoid ON and OFF many times a second and varies the amount of ON time (pulse width) to vary the amount of EGR.

The ECM uses information from the following sensors to regulate the solenoid:
- Coolant Temperature Sensor (CTS).
- Throttle Position Sensor (TPS).
- Distributor (rpm signal).
- MAP
- BARO