Toyota Celica 2005 Repair Manual page 724

CCV
Pressure Switching Valve
Closed
EVAP VSV
Cold Start
ECT/IAT near 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
Medium Leak (ex: Vacuum hose loose)
EVAP VSV
CCV
Pressure Switching Valve
*1: ECM may output some other DTC combination.
*2: Refer to DTC P0441 and P0446 on page DI−501.
2005 CELICA (RM1131U)
DIAGNOSTICS
Open
Closed
Open
DTC Detection Condition
Trouble part
Small Leak
Large Leak (ex: Fuel tank cap loose)
− ENGINE (2ZZ−GE)
Closed
Open
P0441
Negative
Pressure
Introduction
S Fuel tank cap is incorrectly installed
S Fuel tank cap is cracked or damaged
S Vacuum hose is cracked, blocked, damaged or disconnected
((1), (2), (3), (4), (5), (6), (7), (8), (9), (10) and (11) in Fig. 1)
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, or damaged
S Charcoal canister is cracked, 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
723
Open
Closed
P0442, P0456 P0446
Tank & Canister Pressure Switching
Leak Check Valve, CCV Testing
Trouble Area
Typical DTC output (*1)
"P0442" and/or "P0456"
P0442
P0442 and P0441 and P0446 (*2)
P0441
P0442 and P0441 and P0446
P0442 and P0441 and P0446
P0446
P0446
P0442 and P0441 and P0446
DI−525
Closed
A19285