P1490 NISSAN - Vacuum Cut Valve Bypass Valve
Tech notesThere is a factory service bulletin for the following Nissan models:
2002 Nissan Altima
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2002-2005 Nissan Altima Factory Service Bulletin OBDII Code P1490
When is the code detected?An improper voltage signal is sent to ECM through vacuum cut valve bypass valve.
P1490 Nissan DescriptionThe vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line between the fuel tank and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank. The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the Engine Control Module (ECM). When the ECM sends an ON (ground) signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the fuel tank.
P1490 Nissan Information for specific Nissan models
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