P1490 2003 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 2003 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 2003 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 2003 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 2003 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
2003 Nissan Altima Factory Service Bulletin OBDII Code P1490
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1490 2003 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 2003 Nissan Altima Sedan Code
1. What does the OBDII code P1490 mean on a 2003 Nissan Altima Sedan?
P1490 indicates an issue with the Vacuum Cut Valve Bypass Valve, typically related to the evaporative emissions system.
2. What are the common symptoms of a P1490 code on a 2003 Nissan Altima?
Symptoms may include the check engine light turning on, a possible fuel smell near the vehicle, and reduced fuel efficiency.
3. What causes the P1490 code on a 2003 Nissan Altima?
Common causes include a faulty Vacuum Cut Valve Bypass Valve, damaged vacuum hoses, or electrical issues like a broken wire or poor connection.
4. Can a loose gas cap cause the P1490 code on a 2003 Nissan Altima?
No, a loose gas cap typically triggers a different EVAP system code, but it’s still worth checking the gas cap as part of the diagnosis.
5. How can I diagnose the P1490 code on my 2003 Nissan Altima?
Start by inspecting the Vacuum Cut Valve Bypass Valve, checking for damaged hoses, loose connections, and testing the valve's functionality with a multimeter or vacuum pump.
6. Is the P1490 code serious on a 2003 Nissan Altima?
While it doesn’t pose an immediate danger, ignoring the code could lead to increased emissions and potential damage to the EVAP system over time.
7. How do you fix the P1490 code on a 2003 Nissan Altima?
Repairs may include replacing the Vacuum Cut Valve Bypass Valve, repairing or replacing damaged vacuum hoses, and addressing any wiring or connector issues.
8. What is the function of the Vacuum Cut Valve Bypass Valve in a 2003 Nissan Altima?
It helps regulate the flow of fuel vapors in the EVAP system, preventing them from escaping into the atmosphere.
9. Can I drive my 2003 Nissan Altima with the P1490 code active?
Yes, but prolonged driving without fixing the issue may lead to higher emissions and potential harm to other EVAP system components.
10. How much does it cost to repair the P1490 code on a 2003 Nissan Altima?
Repair costs vary but typically range from $100 to $300, depending on whether you replace the Vacuum Cut Valve Bypass Valve or repair associated components.
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