It's call a charcoal canister ,not purge canister !
Purpose
The basic Evaporative Emission (EVAP) Control system used on all vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is running, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge On). The EVAP purge solenoid control is Pulse Width Modulated (PWM) or turned On and Off several times a second. The PCM controlled PWM output is commanded when the appropriate conditions have been met:
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Engine coolant temperature above 25?°C (77?°F).
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After the engine has been running about 2 1/2 minutes on a cold start or 30 seconds on a warm start.
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The vehicle is operating in closed loop fuel control.
The canister is located near the fuel tank ,under the vehicle .
Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Chevrolet
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