P0441 Evaporative Emission Control System Incorrect Purge Flow
First check spark plugs and spark plug wires. If found O, then check EVAP System Components.
EVAP System
DTC Codes : P0440 THRU’ P0455
EVAP (Evaporative Emission Control System) is fully closed system which maintains stable fuel pressure in the system for proper functioning of fuel injectors and engine. properly. It prevents fuel vapors created in gas tank to escape to the atmosphere.
Cars manufactured after 1995, normally uses ECM controlled EVAP System. The major components of this system are:
1) Gas Cap with Vacuum Check Valve
2) Fuel Inlet Filler Pipe
3) Gas Tank
4) Fuel Lines
5) Charcoal Canister with vacuum & pressure check valve
6) VSV : Vacuum Switching Valve
7) P-Port : Ported VacuumPurgePort on throttle body.
Leak or clogging in EVAP system can trigger “Check Engine” Light on. ECU can generate specific code(s) depend upon nature of fault.
GENERAL EVAP SYSTEM SCHEMATIC IS AS UNDER:
You have to check particularly followings:
1) Thermo Vacuum Valve (TVV) or Vacuum Switching Valve (VSV) Solenoid
2) Charcoal Canister
3) Throttle Valve and throttle Position Sensor
4) Purge and Fuel lines.
For more information read thread:
http://www.toyotanation.com/forum/t171748.html
