B250 3/4 Ton Van V8-318 5.2L VIN T FI (1992)
EGR Control Solenoid: Description and Operation
EGR Solenoid and Transducer
California Emissions
OPERATION
California vehicles are supplied with an on-board diagnostic system for the EGR system. This system has a solenoid that is placed in the vacuum
signal line to the EGR valve. The EGR solenoid is used to disable the EGR system so that the engine controller can perform its diagnostic check.
This diagnostic check is activated only during select engine/driving conditions, and checks the entire EGR system for failures. The engine
controller monitors the EGR system and if the system check shows a failure, the CHECK ENGINE lamp in the instrument panel will illuminate
indicating that immediate service is required.
EGR Mounting
CONTROL VALVE AND TRANSDUCER
The EGR system used is a backpressure type. A backpressure transducer measures the amount of exhaust gas backpressure on the exhaust side of
the EGR valve and it varies the amount of vacuum supplied to the EGR valve. The transducer uses this backpressure signal to supply the correct
amount of vacuum to the EGR valve depending on engine load conditions. Vacuum is supplied to the backpressure transducer by a ported vacuum
signal from the throttle body.
Solenoid Trio
EGR SOLENOID
