Evaporative Emission Control System - Toyota Celica 2005 Repair Manual

DI−202
DTC P0441
DTC P0446
CIRCUIT DESCRIPTION
The vapor pressure sensor, canister closed valve (CCV), pressure switching valve are used to detect abnor-
malities 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.
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components
within the dotted line in Fig. 1 below, or when there is a malfunction in either the EVAP VSV, the pressure
switching valve, or in the vapor pressure sensor itself.
Fig. 1
CCV
(7)
2005 CELICA (RM1131U)
DIAGNOSTICS

Evaporative Emission Control System

Incorrect Purge Flow
Evaporative Emission Control System Vent
Control Malfunction
(6)
EVAP
VSV
(4)
(5)
(8)
Charcoal Canister
− ENGINE (1ZZ−FE)
ECM
Pressure
Switching Valve
(3)
400
Vapor Pressure
Sensor
Fuel Tank Over
Fill Check Valve
(1)
(10)
(2)
(11)
(9)
Fuel Tank
DIC6Y−02
A10142