Achieva V6-3300 3.3L (1992)
Canister Purge Solenoid: Description and Operation
Canister Purge Solenoid Normally Closed
PURPOSE:
The Canister Purge Solenoid is controlled by the ECM and allows manifold and/or ported vacuum to purge the fuel evaporative cannister when
energized.
OPERATION:
The ECM operates a normally closed Pulse Width Modulated (PWM) solenoid to control vacuum to purge the canister. Under cold engine or idle
conditions, the solenoid is turned "OFF" by the ECM, which blocks vacuum and prevents purge of the canister. The ECM turns "ON" the solenoid
valve and allows purge when the following conditions are met.
^
Engine coolant temperature above 133°F (56°C)
^
Engine run time after start more than 65 seconds.
In some cases the ECM may also look for these conditions in addition to those listed above in order to purge the canister.
^
Above a specified road speed.
^
Above a specified throttle opening.
^
Ignition "ON," engine stopped, diagnostic terminal B grounded
The ECM also uses input from the 02 sensor to regulate purging of the canister. The ECM also has diagnostic capabilities to set a Code 26 in the
event of a disconnected or shorted wire.
LOCATION:
Top rear of engine near intake manifold.
