Toyota Celica 2005 Repair Manual page 425

DI−226
Pressure Switching Valve
Closed
EVAP VSV
Cold Start
ECT/IAT nearly the same temp.
DTC No.
After negative pressure introduction is completed, the pressure
P0442
in the EVAP system sharply increases. (small leak) (2 trip
detection logic)
The pressure in the EVAP system slightly increases while the
P0456
ECM performs a leak check. (very small leak) (2 trip detection
logic)
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 DTCs combination.
*2: Refer to DTC P0441 and P0446 on page DI−202
2005 CELICA (RM1131U)
DIAGNOSTICS
Open
CCV
Closed
Open
DTC Detection 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
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
S EVAP VSV
S Open or short in circuit for CCV
S CCV
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
424
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
P0441, P0442 and P0446
P0441
P0441, P0442 and P0446
P0441, P0442 and P0446
P0446
P0446
P0441, P0442 and P0446
Closed
A19285