Pickup 2WD L4-2559cc 2.6L SOHC (4ZE1) (1993)
EGR Backpressure Transducer: Description and Operation
Back Pressure Transducer
PURPOSE
Regulates the vacuum signal to the EGR valve, depending on exhaust gas pressure.
LOCATION
At the back of the intake manifold.
OPERATION
The back pressure transducer regulates the vacuum signal to the EGR valve. When the exhaust pressure is low, the transducer opens a small air
bleed passage allowing some air into the vacuum circuit. This reduces the vacuum signal to the EGR valve and the valve closes slightly. If the
exhaust pressure is very low the EGR valve will close completely. When exhaust pressure is high, the air bleed passage is closed and control
vacuum is directly applied to the EGR valve diaphragm.