P1490 Nissan - Vacuum Cut Valve Bypass Valve
- Faulty Vacuum Cut Valve Bypass Valve
- Clogged vacuum hoses to the Vacuum Cut Valve Bypass Valve
- Vacuum cut valve bypass valve harness is open or shorted
- Vacuum cut valve bypass valve electrical circuit poor connection
When is the code detected?
An improper voltage signal is sent to ECM through vacuum cut valve bypass valve.
- Engine Light ON (or Service Engine Soon Warning Light)
P1490 Nissan Description
The 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 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
Need more help?
Do you need more help with the P1490 Nissan code? ask a question to our users or search the top hand picked automotive forums for more information
NISSAN Technical Service Bulletins for P1490 code
2002 NISSAN ALTIMA Electrical System Details
2003 NISSAN ALTIMA Electrical System Details
2004 NISSAN ALTIMA Electrical System Details
2005 NISSAN ALTIMA Electrical System Details
2002 NISSAN ALTIMA 110000 Electrical System Details
Need parts to fix this code? Search hundreds of stores at the same time and compare prices
Help us improve Engine-Codes.com. Leave a comment below or tell us if the information above help you fix the code. What are symptoms is your vehicle for the P1490 Nissan code?
Have you replaced any parts?
Any information is appreciated. Thanks