Pathfinder LE 2WD V6-3.3L (VG33E) (1999)
EGR Valve: Description and Operation
SYSTEM DESCRIPTION
This system outs and controls vacuum applied to the EGR valve to suit engine operating conditions. This cut-and-control operation is
accomplished through the ECM and the EGRC-solenoid valve. When the ECM detects any of the following conditions, current does not flow
through the solenoid valve. This causes the intake manifold vacuum to be discharged into the atmosphere. The EGR valve remains closed.
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Low engine coolant temperature
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Engine starting
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High-speed engine operation
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Engine idling
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Excessively high engine coolant temperature
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Mass air flow sensor malfunction
COMPONENT DESCRIPTION
Exhaust Gas Recirculation (EGR) Valve
The EGR valve controls the amount of exhaust gas routed to the intake manifold. Vacuum is applied to the EGR valve in response to EGRC-BPT
valve operation. The vacuum controls the movement of a taper valve connected to the vacuum diaphragm in the EGR valve.
EGRC-solenoid Va1Ve
The EGRC-solenoid valve responds to signals from the ECM. When the ECM sends an ON (ground) signal, the coil in the solenoid valve is
energized. The vacuum signal (from the intake manifold collector to the EGR valve) passes through the solenoid valve. The signal then reaches the
EGR valve.
When the ECM sends an OFF signal, a plunger will then move to cut the vacuum signal.