P1490 2002 Nissan Altima Sedan Code - Vacuum Cut Valve Bypass Valve
Quick Answer
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. Common causes include 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. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1490 2002 Nissan Altima Sedan indicates Vacuum Cut Valve Bypass Valve.
- Common causes
- Common causes include 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.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1490 2002 Nissan Altima Sedan Description
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.
What are the Possible Causes of the DTC P1490 2002 Nissan Altima Sedan?
- 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
How to Fix the DTC P1490 2002 Nissan Altima Sedan?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
2002 Nissan Altima Factory Service Bulletin OBDII Code P1490
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1490 2002 Nissan Altima Sedan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1490 2002 Nissan Altima Sedan Code
1. What does OBDII code P1490 on a 2002 Nissan Altima Sedan indicate?
Code P1490 refers to a fault with the Vacuum Cut Valve Bypass Valve in the vehicle's evaporative emission control system.
2. What are the common symptoms of a Vacuum Cut Valve Bypass Valve issue?
Common symptoms include difficulty starting the vehicle, rough idling, stalling, and the illumination of the Check Engine Light.
3. What are the possible causes of OBDII code P1490 on a 2002 Nissan Altima?
Potential causes include a faulty Vacuum Cut Valve Bypass Valve, damaged vacuum hoses, a clogged charcoal canister, or electrical issues within the system.
4. How can I diagnose a Vacuum Cut Valve Bypass Valve problem on my 2002 Nissan Altima?
Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, visually inspecting the vacuum hoses for damage, and checking the electrical connections to the valve.
5. Can I continue driving my 2002 Nissan Altima with OBDII code P1490?
It is not recommended to drive the vehicle with a P1490 code as it can lead to poor engine performance and potential emissions issues. It's best to address the problem promptly.
6. How can I repair a Vacuum Cut Valve Bypass Valve issue on my Nissan Altima?
Repairing the issue may involve replacing the faulty valve, repairing or replacing damaged vacuum hoses, cleaning or replacing the charcoal canister, or addressing any electrical faults.
7. Are there any DIY tips for fixing OBDII code P1490 on a 2002 Nissan Altima?
While some may attempt to replace the Vacuum Cut Valve Bypass Valve themselves, it's advisable to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.
8. Will resetting the Check Engine Light resolve the P1490 code on my Nissan Altima?
Simply resetting the Check Engine Light will not fix the underlying issue causing code P1490. The problem must be diagnosed and repaired for the light to stay off permanently.
9. How much does it typically cost to repair a Vacuum Cut Valve Bypass Valve problem on a 2002 Nissan Altima?
The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.
10. Can a Vacuum Cut Valve Bypass Valve issue affect the overall performance of my 2002 Nissan Altima?
Yes, a malfunctioning Vacuum Cut Valve Bypass Valve can lead to poor engine performance, reduced fuel efficiency, and potential emissions problems if left unresolved.
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