Evaporative Emission Control System Purge Flow Monitoring

System Description

NOTE: If DTC P1447 is displayed with P0510, perform trouble diagnosis for DTC P0510 first.

In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.