Toyota Celica 2005 Repair Manual page 447

DI−248
DTC No.
Vapor pressure sensor output extremely changes under condi-
tions of (a) and (b): (2 trip detection logic)
(a) Vehicle speed: 0 km/h (0mph), Engine speed: Idling and
P0451
pressure switching valve is OFF
(b) Vapor pressure sensor value y opening pressure valve of
charcoal canister
10 seconds or less after engine starting, vapor pressure sen-
P0452 sor value remains less than the fixed value:
(2 trip detection logic)
10 seconds or less after engine starting condition, vapor pres-
P0453 sure sensor value remains more than the fixed value:
(2 trip detection logic)
MONITOR STRATEGY
P0451
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
P0452 and P0453
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
2005 CELICA (RM1131U)
DIAGNOSTICS
DTC Detecting Condition
Main sensors/components
Related sensors/components
Once per driving cycle
Fuel tank pressure sensor "Noise" monitor: 10 sec.
Fuel tank pressure sensor "Stuck" monitor: 20 min.
2 driving cycles
None
Main sensors/components
Related sensors/components
Once per driving cycle
17 sec.
2 driving cycles
None
− ENGINE (1ZZ−FE)
S Open or short in vapor pressure sensor circuit
S Vapor pressure sensor
S ECM
P0451
P0452
P0453
446
Trouble Area
Evaporative emission control system pressure
sensor range/performance
Vapor pressure sensor
Mass air flow meter, Engine coolant temperature
sensor
Evaporative emission control system pressure
sensor/switch low input
Evaporative emission control system pressure
sensor/switch high input
Vapor pressure sensor
Mass air flow meter, Engine coolant temperature
sensor