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1999 Nissan Altima Code: P1490

Tiny
JUNIORALTI
  • MEMBER
  • 1999 NISSAN ALTIMA
  • 2.4L
  • 4 CYL
  • FWD
  • MANUAL
  • 130,000 MILES
Hello my name is Junior and I have a question on my 1999 Nissan Altima gxe. My car shakes while it idles, the rpms go up and down on its own, and in some cases it stalls while in neutral. Since the check engine light is on I took it to Auto Zone a few days ago for a diagnostics. I got a code that read: P1490 which means vacuum cut valve bypass valve (circuit)? I am really confused on what this means exactly. I have changed my spark plugs and looked for "vacuum leaks" by spraying carburator cleaner around the intake manifold with no luck. If you could please help me out on how to determine what it is and give me some tips on how to fix it, I would greatly appreciate it. Thank you for your time.
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Thursday, January 23rd, 2014 AT 5:52 PM

2 Replies

Tiny
MLDANIELS2000
  • MECHANIC
  • 227 POSTS
Valve is located underneath vehicle near evap canister near the fuel tank. Check for cut, cracked, torn lines around that area. Vacuum leak could be possible in those lines but the valve itself could also be malfuntioning. Code is referencing improper signal return from that valve meaning inoperative valve most likely.
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Thursday, January 23rd, 2014 AT 8:41 PM
Tiny
MLDANIELS2000
  • MECHANIC
  • 227 POSTS
Also check for torn wiring underneath the vehicle. It is very common for road debris to cut wires and hoses especially smaller cars due to lower ground clearance.
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Friday, January 24th, 2014 AT 5:36 PM

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