Question about Pontiac Cars & Trucks
How do you test a fuel EVAP vacuum Switch? I have energized the EVS with 5V then 12V the valve remains stuck? open. Does it simply make an electrical connection internally competing the circuit back to the PCM under vacuum situations? It's a 2-wire unit both have been removed to bench test.
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Posted on Jan 02, 2017
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An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.
An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .
Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system
Do you have a scan tool that reads data PID'S ?
Your FTP - fuel tank pressure sensor could be at fault !
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Most likely is a bad EVAP purge valve. But check below list.
This indicates that a part of the EVAP control system is no longer functioning 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 controlled
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.
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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:
With a P0441 OBD-II trouble code, diagnosis
can be tricky at times. Here are some things to try:
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