Toyota Camry Manual page 1358

DTC P0450
DTC P0451
CIRCUIT DESCRIPTION
The vapor pressure sensor and VSV for vapor pressure sensor are used to detect abnormalities in the evap-
orative 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.
10 seconds or more after engine starting condition (a) or (b)
continues for 7 seconds or more:
(2 trip detection logic)
P0450 (a) Vapor Pressure Sensor Value
–1.0 in.Hg)
(b) Vapor Pressure Sensor Value X 1.5 kPa (15 mmHg,
0.4 in.Hg)
Vapor pressure sensor output extremely changes under
conditions of (a), (b) and (c):
(2 trip detection logic)
P451
(a) Vehicle speed: 0 km/h (0 mph)
(b) Engine speed: Idling
(c) VSV for vapor pressure sensor is ON.
DIAGNOSTICS
Evaporative Emission Control System
Pressure Sensor Malfunction
Evaporative Emission Control System
Pressure Sensor Range/Performance
VSV
for EVAP
Charcoal Canister
DTC Detecting Condition
<
–3.5 kPa (–26 mmHg,
– ENGINE (1MZ–FE)
ECM
Vapor Pressure
Sensor
VSV for Vapor
Pressure Sensor
D Open or short in vapor pressure sensor circuit
D Vapor pressure sensor
V
D ECM
Author :
DI–331
Fuel Tank Over
Fill Check Valve
Fuel Tank
Trouble Area
Date :
DI1K5–03
A01655
566