Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 610 / 1976

A10140
ECM
VSV
for EVAP
Charcoal Canister
Fuel Tank
Fig. 1
(2)
(3)
(4)
(6)
(8)
(9)
(1)
(5)
Fuel Tank Over
Fill Check Valve
(7)
Vapor Pressure
Sensor
VSV for
CCV
VSV for
Pressure
Switching
Valve
(10)
(11)
DI-72
- DIAGNOSTICS ENGINE
226
Author: Date:
2001 SIENNA (RM787U)
DTC P0440 Evaporative Emission Control System Mal-
function
DTC P0442 Evaporative Emission Control System Leak
Detected (Small Leak)
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 P0440 or P0442 is recorded by the ECM when evaporative emissions leak from the components within
the dotted line in Fig. 1 below, or when the vapor pressure sensor malfunctions.
DTC No. DTC Detecting Condition Trouble Area
P0440
P0442
After cold starting and when generating certain swift pressure
value in fuel tank enabling not to hold that value (2 trip detec-
tion logic)
Hose or tube cracked, hole, damaged or loose seal ((3) in
Fig. 1)
Fuel tank cap incorrectly installed
Fuel tank cap cracked or damaged
Vacuum hose cracked, holed, blocked, damaged or discon-
nected ((1) or (2) in Fig. 1)
Fuel tank cracked, holed or damaged
Charcoal canister cracked, holed or damaged
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Fuel tank over fill check valve cracked or damaged
ECM
DI6T6-02