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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Controls And Fuel - 2.0L (LSY) - Description And Operation) >> Description and Operation >> Evaporative Emission Control System Description >> Evaporative Emission Canister Vent Restriction Test

Evaporative Emission Canister Vent Restriction Test

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If the Evaporative Emission vent system is restricted, fuel vapors will not be properly purged from the Evaporative Emission Canister. The ECM tests this by commanding the Q12 Evaporative Emission Purge Solenoid Valve ON/Open while commanding the Q13 Evaporative Emission Canister Vent Solenoid Valve OFF/Open, and then monitoring the B150 Fuel Tank Pressure Sensor for an increase in vacuum. If the vacuum increases more than the expected amount, in a set amount of time, a fault will be logged by the ECM.

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