Toyota Celica 2005 Repair Manual page 402

Pressure Switching Valve
Closed
EVAP VSV
Cold Start
ECT/IAT nearly the same temp.
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−278.
2005 CELICA (RM1131U)
DIAGNOSTICS
Open
CCV
Closed
Open
DTC Detecting Condition
Trouble part
Small Leak
Large Leak (ex: Fuel tank cap loose)
− ENGINE (1ZZ−FE)
Closed
Open
P0441
Negative
Pressure
Introduction
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 VSV circuit for EVAP
S EVAP VSV
S Open or short in VSV circuit for CCV
S CCV
S Open or short in VSV 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 or damaged
S ECM
Open Malfunction
Close Malfunction
Open Malfunction
Close Malfunction
Open Malfunction
Close Malfunction
401
Open
Closed
P0442, P0456 P0446
Tank & Canister Pressure Switching
Leak Check Valve, CCV Testing
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
DI−203
Closed
A19285