Date registered: Dec 2007
Vehicle: 95 SL500, K&N, NEOKEN Ported TB, Custom Intake, RENNtech Sport Exhaust, AMG I Monoblocks
Location: Raleigh, NC
Mentioned: 3 Post(s)
Tagged: 2 Thread(s)
Quoted: 26 Post(s)
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.
A code P0441 could mean one or more of the following has happened:
-Bad vacuum switch
-Broken or damaged EVAP line or canister
-Open in PCM purge command circuit
-Open or short in Voltage feed circuit to Purge Solenoid
-Faulty purge solenoid
-Restriction in EVAP solenoid, line or canister
-Corrosion or resistance in purge connector
With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
-Check for damaged EVAP lines/hoses or canister
-Check for open or short in voltage feed circuit to Purge Solenoid
-Repair restriction in Evap line or canister or soleniod
-Repair resistance in purge connector
Last edited by NEOKEN; 03-24-2009 at 11:54 PM.
Reason: typo error