DTC Description: Notes
This diagnosis detects clogs in the EVAP line between fuel tank and EVAP canister purge volume control solenoid valve.
ECM controls EVAP control system as below. ECM monitors EVAP line pressure change to diagnose if there is no clogging between EVAP canister and fuel tank.
- ECM closes EVAP canister vent control valve while the engine is running.
- ECM controls EVAP canister purge volume control solenoid valve. (Fuel vapor in EVAP line is absorbed by intake manifold pressure)
- ECM monitors EVAP line pressure change using EVAP control system pressure sensor. (When there is clogging in EVAP line, the path to the space of fuel tank is partially blocked. As a result, the pressure in EVAP line drops faster.)