S15/T15 Sonoma P/U 2WD L4-2.2L VIN 4 (1995)
EGR Control Solenoid: Description and Operation
EGR System
OPERATION:
To regulate Exhaust Gas Recirculation (EGR) flow a control module controlled solenoid is used in the vacuum line. This is a normally closed
solenoid vacuum valve which is opened when the control module completes the ground. The control module will energize the EGR solenoid (EGR
ON) when the engine is warm and above idle. There is little EGR flow at wide open throttle due to lack of engine vacuum.
