A10145
ECM
Fuel Tank
Charcoal Canister
VSV for
EVAP
Fuel Tank Over
Fill Check Valve
Vapor Pressure Sensor
VSV for
CCV
VSV for
Pressure
Switching Valve
-
DIAGNOSTICS
ENGINE
DI-95
249
Author:
Date:
2001 SIENNA (RM787U)
DTC
P0450
Evaporative Emission Control System Pres-
sure Sensor Malfunction
DTC
P0451
Evaporative Emission Control System Pres-
sure Sensor Range/Performance
CIRCUIT DESCRIPTION
The vapor pressure sensor,
VSV for canister closed valve (CCV) and VSV for pressure switching valve are
used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunction.
DTC No.
DTC Detecting Condition
Trouble Area
P0450
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or more: (2
trip detection logic)
P0451
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
VSV for pressure switching valve is OFF
(b) vavor pressure sensor value
opening pressure valve of
charcoal canister
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
ECM
DI081-05
Содержание RM787U
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