Human genetics: Pleiotropic mutations. Hannah Stower. A large-scale analysis of SNPs and genes that are reported to be associated with common complex diseases and traits has found abundant pleiotropy: that is, each individual gene mutation may have a role in multiple diseases. large-scale analysis of SNPs and genes that are reported to be associated with common complex diseases and traits has found abundant pleiotropy: that is, each individual gene mutation may have a role in multiple diseases.
EVAP Vent Valve. The evaporative canister vent valve not only allows the fresh outside air to the EVAP canister during the purge modes, but also allows the diagnostic to pull a vacuum on the fuel tank by closing the vent valve. This valve is normally open. EVAP Canister.
The EVAP canister and canister purge control valve are tested and replaced as an assembly. 1  Remove the EVAP canister from the vehicle. 2  Visually inspect the canister. 3  Replace it with a new one if there is any evidence of cracks or other damage. 4  Blow air into port A.5  There should be no airflow from ports B or C.he EVAP canister purge control valve is part of the EVAP canister assembly. Please refer to Component Testing, EVAP Canister for the canister purge control valve test procedure. 1  Remove the purge control valve from the vehicle. 2  Blow air into each port. 3  There should be no airflow through any ports.