Related DTC

DTC No.	Monitoring items	Reference
P0441	Purge flow
P0451	Difference in pressure between canister pressure sensor (integrated into canister pump module) and air pressure sensor
P0452	Canister pressure sensor (integrated into canister pump module) voltage LOW
P0453	Canister pressure sensor (integrated into canister pump module) voltage HIGH
P0455	Large leak from EVAP
P0456	Small leak from EVAP
P0458	Purge VSV voltage LOW
P0459	Purge VSV voltage HIGH
P1449	Clogged air filter (integrated into canister pump module)
P1451	Clogged pipe
P2404	Flow rate rises at reference orifice (integrated into canister pump module). Flow rate reduces at reference orifice (integrated into canister pump module).
P2401	Leak detection pump stuck OFF (integrated into canister pump module)
P2402	Leak detection pump stuck ON (integrated into canister pump module)
P2419	Closing of vent valve stuck (integrated into canister pump module) or not
P2420	Opening of vent valve stuck (integrated into canister pump module) or not
P2610	Soak timer (integrated into ECM)

When the DTCs related to the EVAP system have been stored, the malfunctioning section can be located using the table below.

Fig 1: DTC Malfunctioning Areas Table (1 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: DTC Malfunctioning Areas Table (2 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: If the standard pressure difference between 1st check and 2nd check is out of specification, all DTCs (P0455, P0456, P1451, P2404) related to standard pressure are stored.