Backpressure Transducer Operation

EGR System Vacuum Connections:

Electric EGR Transducer (EET):

NOTE: The [1][2]Electric EGR Transducer (EET) assembly is a vacuum control solenoid and a backpressure transducer, in one package.

PURPOSE
When the solenoid is de-energized the backpressure transducer varies the amount of vacuum routed to the EGR valve control nipple, (depending on engine load conditions).

OPERATION
Transducer is supplied ported vacuum through the solenoid valve.

Transducer is a variable vacuum bleed valve, controlled by exhaust backpressure.
- When there is no exhaust backpressure, the vacuum bleed valve is completely open, and no vacuum is applied to the EGR valve.
- When exhaust backpressure is great enough, it closes the vacuum bleed valve completely, and maximum vacuum is applied to the EGR valve.
- When exhaust backpressure is present, but not great enough to close the vacuum bleed valve completely, the vacuum applied to the EGR valve varies with the backpressure.