GMC 17113529 Valve Asm,Evap Emission Canister Vent Solenoid (W/ Bracket)

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OBD-II models perform a self-diagnostic check during cold engine startup, where the PCM opens the EVAP canister purge valve and closes the vent valve, creating a vacuum in the entire EVAP system. Upon reaching the correct vacuum level, the PCM closes the purge valve to seal the system and monitors the fuel tank pressure sensor voltage. It sets a diagnostic code if it detects a leak. The fuel tank pressure sensor operates similarly to a MAP sensor, returning a signal voltage to the PCM corresponding to the air pressure inside the fuel tank.

Fuel tank vapor is directed through a check valve into the charcoal canister, where activated charcoal absorbs the vapors. When specific conditions are met (e.g., engine running, preset temperature reached), the ECM/PCM opens both the purge valve and vent valve. This action allows fuel vapors from the canister to be drawn into the intake manifold and combustion chamber, where they are consumed during engine operation. The ECM/PCM controls the vapor flow rate by modulating the EVAP purge valve control solenoid's duty cycle.