K 1500 Truck 4WD V6-262 4.3L (1991)
EGR Electronic Vacuum Regulator Solenoid: Description and Operation
ECM EGR Solenoid
To regulate EGR flow, the ECM operates a solenoid to control the EGR valve. This solenoid is normally closed. By providing a ground path, the ECM
energizes the solenoid which then allows vacuum to pass to the EGR valve.
The ECM control of the EGR is based on the following inputs:
1. Coolant Temperature above 25~C
2. Throttle Position (TPS) - "OFF" idle
3. MAP
