Neon L4-2.0L SOHC (1995)
Canister Purge Solenoid: Description and Operation
Duty Cycle EVAP/Purge Solenoid
Fig. 3 Duty Cycle EVAP Purge Solenoid
PURPOSE
The duty cycle EVAP purge solenoid regulates the rate of vapor flow from the EVAP canister to the throttle body. The PCM operates the
solenoid.
OPERATION
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid.
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When de-energized, no vapors are purged.
When purging, the PCM energizes and de-energizes the solenoid approximately 5 or 10 times per second, depending upon operating conditions.
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The PCM varies the vapor flow rate by changing solenoid pulse width.
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Pulse width is the amount of time the solenoid energizes.
The solenoid attaches to a bracket which is attached to the front engine mount (Fig. 3).
CIRCUIT OPERATION
Circuit F18 supplies battery voltage to the duty cycle EVAP/Purge solenoid. The Powertrain Control Module (PCM) switches ground path for the
solenoid ON and OFF through circuit K52.
Circuit F18 connects to a bus bar in the fuse block fed by circuit A21. A 15 amp fuse in the fuse block, cavity 10, protects circuit F18. Circuit F18
connects to cavity 54 of the PCM, and cavity 1 of the solenoid connector.
Circuit K52 connects to cavity 16 of the PCM, and cavity 2 of the solenoid connector.
NOTE: The solenoid will not operate properly unless it is installed with the electrical connector at the top.
