Toyota ZZT230 series Repair Manual page 292

DTC
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and
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
P0440
vapor pressure sensor signal.
or P044 2 is recorded by the ECM when evaporative emissions leak from the components within
DTC
the dotted line in Rg. 1 below, or when the vapor pressure sensor malfunctions.
FI!J.
1
No.
DTC
Fuel
""""
driven lor 20
)
DIAGNOSTlCS
P0440 Eva
Mal unction
Charcoal Canister
ore
Detecting Condition
pressure atmospheric press u re
is
tank
min. (2 trip detection logic)
ENGINE
ft
orative Emission Control System
ECM
VSV for
pressure :
Switchingl
Valve :
,
( )
l
'
'
_______________ --- '
:
'
'
:
'
•-----------------------------------
• Hose or tube cracked, hole, damaged or loose seal {{3) in
Fig. 1)
•Fuel
•Fuel tank
Vacuum
•
nected ((1) or (2) In Flg.
after vehicle Is
• Fuel tank cracked, holed o r damaged
• Charcoal canist&f ctacked. holed or damaged
•Open or short in
•Vapor
• Fuel tank over fill check valve cracked or damaged
•ECM
VSV
r
fo pressure switching valve are
�------------------------------�
'
:
'
[ Vapor Pressure
'
Sensor
Fuel Tank Over
'
( 1 I
'
Fill Check Valve
'
Fuel Tank
Trouble Area
cap inoo rr &Ctly
lark
Installed
cap
cracked or damaged
hose cracked, holed, blocked, damaged or discon·
1 )
vapor pressure
sensor
pressure sensor
" ""
Dl-81
' "' '
(1 0)
... 1014(1
circu�