DTC Summary

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P1420	Evaporative Emission Canister Small Leak	Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at the start and at the end of leak check. If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak.	EVAP leak (purge VSV - canister - fuel vapor-containment valve) Purge VSV Connector/wire harness (purge VSV - ECM) Canister pump module ECM	Comes on	DTC stored
P1421	Evaporative Emission Canister Gross Leak	Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at the start and at the end of leak check. If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak.	EVAP leak (purge VSV - canister - fuel vapor-containment valve) Purge VSV Connector/wire harness (purge VSV - ECM) Canister pump module ECM	Comes on	DTC stored

DTC No.	Monitoring Item	Detection Timing	Detection Logic
P1420	Canister small leak	While power switch is off	2 trip
P1421	Canister gross leak	While power switch is off	2 trip