B250 3/4 Ton Van V8-318 5.2L VIN T FI (1992)
EGR Backpressure Transducer: Description and Operation
Electronic EGR Transducer (EET) Operation
With California Emissions
EGR Transducer
Electric EGR Transducer (EET)
PURPOSE
The Electric Exhaust Gas Recirculation Transducer combines the functions of the Back Pressure Transducer and the Electric Vacuum Solenoid
into one devise.
TRANSDUCER OPERATION
The 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 from a port on the EVAP Purge Solenoid.
SOLENOID OPERATION
The Electric Vacuum Solenoid is controlled by the engine controller. The PCM monitors engine coolant temperature and other operating
conditions to determine when to energize the solenoid. When the engine controller supplies a ground to the solenoid (energizing), vacuum is cut
off from the EGR transducer. When the engine controller removes the ground from the solenoid (de-energizing), vacuum is allowed to flow
through the solenoid and out to the EGR transducer.
ON-BOARD DIAGNOSTICS 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.
