I-50
ENGINE <NON-TURBO>
-
Control System
Operation
The EGR system consists of a vacuum solenoid,
back pressure transducer and a vacuum operated
sure causes the transducer diaphragm to modulate.
valve. When activated, the solenoid allows vacuum
This allows intake manifold vacuum to reach the
L)
to flow to the transducer. Negative exhaust back-
EGR valve. The combination of vacuum on one
pressure allows manifold vacuum from the solenoid
side of the valve diaphragm and exhaust back
pres-
to vent to atmosphere. Positive exhaust
backpres-
sure on the other allows exhaust gases to be
introduced into the intake manifold.
transducer
EGR valve
AFUOW7
An EGR system stuck in the closed position prevents
the system from decreasing
NOx
emissions. A
sys-
tern stuck in the open position can increase
hydro-
carbon emissions, fuel consumption, and produce
rough engine operation.
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