Toyota ZZT230 series Repair Manual page 315

DJ-104
DTC
P0450
DTC P0451
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and VSV for pressure switching valve are
used to detect abnonnalities 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.
DTCNo.
leas after
10 seconds or
ronlinues seconds or
for 7
(a) Vapor Jl111S S U r& SflnSOfvahJe
P0450
in.Hg)
Vapor pressure sensot value
{b)
in.Hg)
of
Vapor pressure sensor output extremely changes under condl·
(b): (2 1rip
lions (a)
or
POOl (a) Vehicle speed : 0 kmlh
VSV for
pressu re SWitching
Evaporative Emission Control System
Pressure Sensor Malfunction
Evaporative Emission Control System
Pressure Sensor Range/Performance
Charcoal Canister
DTC Detecting Concit10n
condition
<
engine starting (a) or
(2
more: trip detecllon logic)
kPa (-30 mmHg,
-4.0
�
kPa (15 mmHg, 0.6
2.0
logic)
deteclion
speed : !dling and
(Omph),Engine
valve is
OFF
-
ECM
VSV for
Fuel Tank
(b)
-1.2
• or short in vapor pressure sensor circuit
Open
• Vapor pressure sensor
E
• C
M
......... .
Fuel Tank Over
Fill Check Valve
A10146
Trouble Area