Toyota Celica 2005 Repair Manual page 702

DTC No.
Pressure in charcoal canister and fuel tank does not drop dur-
ing purge control (2 trip detection logic)
P0441
Negative pressure incoming in the charcoal canister and fuel
tank does not stop during purge cut−off. (2 trip detection logic)
No rising of the fuel tank pressure when commanding the CCV
to open after the EVAP leak test
No changing of the fuel tank pressure when commanding the
pressure switching valve to be checked after the EVAP leak
P0446
test
A high negative pressure (vacuum) does not occur in the sys-
tem when commanding the EVAP VSV to open with the CCV
closed
HINT:
Typical DTC output of each trouble part is shown in the table below.
Medium Leak (ex: Vacuum hose loose)
EVAP VSV
CCV
Pressure Switching Valve
*1: ECM may output some other DTC combination.
*2: Refer to P0442 and P0456 on page DI−524.
MONITOR STRATEGY
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
2005 CELICA (RM1131U)
DIAGNOSTICS
DTC Detecting Condition
Trouble part
Small Leak
Large Leak (ex: Fuel tank cap loose)
Main sensors/components
Related sensors/components
Once per driving cycle
P0441 : 90 sec.
P0446 : 10 sec.
2 drive cycles
None
− ENGINE (2ZZ−GE)
S Vacuum hose is cracked, holed, blocked, damaged or discon-
nected ((1), (2), (3), (4), (5), (6), (7), (8), (9), (10) and (11) in
Fig. 1)
S Fuel tank cap is incorrectly installed
S Fuel tank cap is cracked or damaged
S Open or short in vapor pressure sensor circuit
S Vapor pressure sensor
S Open or short in circuit for EVAP VSV
S EVAP VSV
S Open or short in circuit for CCV
S CCV
S Open or short in circuit for pressure switching valve
S Pressure switching valve
S Fuel tank is cracked, holed or damaged
S Charcoal canister is cracked, holed or damaged
S Fuel tank over fill check valve is cracked damaged
S ECM
Open Malfunction
Close Malfunction
Open Malfunction
Close Malfunction
Open Malfunction
Close Malfunction
P0441
P0446
701
Trouble Area
Typical DTC output (*1)
"P0442" and/or "P0456" (*2)
P0442
P0442, P0441 and P0446
P0441
P0442, P0441 and P0446
P0442, P0441 and P0446
P0446
P0446
P0442, P0441 and P0446
EVAP VSV malfunction
Canister close valve stuck closed
Pressure switching valve malfunction
EVAP VSV malfunction
Vapor pressure sensor
Engine coolant temperature sensor, Intake air
temperature sensor, Vehicle speed sensor
DI−503