Toyota Camry Manual page 1346

DTC No.
Pressure in charcoal canister does not drop during purge con-
trol (2 trip detection logic)
P0441
During purge cut–off, pressure in charcoal canister is very low
compared with atmospheric pressure
(2 trip detection logic)
When VSV for vapor pressure sensor is OFF, ECM judges that
there is no continuity between vapor pressure sensor and
charcoal canister (2 trip detection logic)
When VSV for vapor pressure sensor is ON, ECM judges that
there is no continuity between vapor pressure sensor and fuel
P0446
tank (2 trip detection logic)
After purge cut off operates, pressure in charcoal canister is
maintained at atmospheric pressure
(2 trip detection logic)
WIRING DIAGRAM
Refer to DTC P0440 (Evaporative Emission Control System Malfunction) on page
DIAGRAM.
INSPECTION PROCEDURE
HINT:
D
If DTCs P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTCs P0441,
P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next.
D
Read freeze frame data using TOYOTA hand–held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air–fuel
ratio lean or rich, etc. at the time of the malfunction.
D
When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.
TOYOTA hand–held tester
1 Check VSV connector for EVAP, VSV connector for vapor pressure sensor and
vapor pressure sensor connector for looseness and disconnection.
OK
DIAGNOSTICS
DTC Detecting Condition
NG
– ENGINE (1MZ–FE)
D Open or short in VSV circuit for EVAP
D Open or short in VSV circuit for vapor pressure sensor
D Open or short in vapor pressure sensor circuit D Open or short in vapor pressure sensor circuit
D VSV for EVAP
D VSV for vapor pressure sensor
D Vapor pressure sensor
Va or ressure sensor
D Vacuum hose cracks, holed blocked, damaged or
disconnected ((1), (4), (5),(6) and (7) in fig. 1)
D Charcoal canister cracks, holed or damaged
D Fuel tank over fill check valve cracked or damaged
F l t k fill h k
Repair or connect VSV or sensor connector.
Author :
Trouble Area
l k d d d
DI–311 for the WIRING
Date :
DI–319
554