Po440 code 96 nissan pu 2.4 engine
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.
A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks
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Feb 22, 2012 |
Cars & Trucks