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Purge Flow Sensor: Description and Operation
PURPOSE The
Purge Flow Sensor (PFS) is used to:
-
check purge solenoid function during the OBD II evaporative emissions test.
-
monitor vapor flow through the purge solenoid.
-
produce a change in sensor output for a given flow/no-flow condition.
The Powertrain Control Module
(PCM) monitors PFS output voltage.
