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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 417 (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

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

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 ValveON/Open while commanding the Q13 Evaporative Emission Canister Vent Solenoid ValveOFF/Open, and then monitoring the B150 Fuel Tank Pressure Sensorfor 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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