1999 Toyota Camry

Hi TINARONH,

DTC P0441: INCORRECT EVAP PURGE FLOW OR DTC P0446: EVAP VENT CONTROL CIRCUIT

NOTE:
Under certain driving conditions a false DTC P0446 may set. A vacuum control valve assembly has been developed to prevent this condition. See Technical Service Bulletin (TSB) No. EG004-99.

NOTE:
If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, perform appropriate test first before performing DTC P0440 test.

Circuit Description
Vapor pressure sensor and vapor pressure sensor Vacuum Switching Valve (VSV) are used to detect faults in EVAP system. DTC is set if EVAP system leak is detected or if there is a malfunction in EVAP VSV, vapor pressure sensor VSV or in vapor pressure sensor. Possible causes are:
"Â Vapor pressure sensor VSV circuit is open or shorted.
"Â Vapor pressure sensor circuit is open or shorted.
"Â Defective vapor pressure sensor VSV.
"Â Defective Vapor pressure sensor.
"Â Defective EVAP VSV.
"Â EVAP VSV circuit is open or shorted.
"Â Disconnected or blocked vacuum hose.
"Â Defective charcoal canister.
"Â Fuel tank over fill valve cracked or damaged.