P1490 Nissan 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 Nissan 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 Nissan 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 Nissan?
- 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 Nissan?
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
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2002-2005 Nissan Altima Service Bulletin OBDII Code P1490
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1490 Nissan 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.
Need more information about the P1490 Nissan code?
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Information for Specific Nissan Models
- P1490 2002 Nissan Altima Sedan — Vacuum Cut Valve Bypass Valve
- P1490 2003 Nissan Altima Sedan — Vacuum Cut Valve Bypass Valve
Frequently Asked Questions about P1490 Nissan Code
1. What are the common symptoms of OBDII code P1490 (Nissan) related to the Vacuum Cut Valve Bypass Valve?
- Common symptoms include poor engine performance, reduced fuel efficiency, and potential stalling or rough idling.
2. What are the typical causes of OBDII code P1490 (Nissan) indicating an issue with the Vacuum Cut Valve Bypass Valve?
- Causes can include a faulty bypass valve, vacuum leaks in the system, electrical issues, or a malfunctioning vacuum cut valve.
3. How can I diagnose OBDII code P1490 (Nissan) related to the Vacuum Cut Valve Bypass Valve?
- Diagnosis involves checking the bypass valve and vacuum cut valve for proper operation, inspecting vacuum lines for leaks, and testing the electrical connections.
4. Can a DIY enthusiast repair OBDII code P1490 (Nissan) associated with the Vacuum Cut Valve Bypass Valve?
- Some repairs, such as replacing a faulty bypass valve or fixing vacuum leaks, can be done by DIYers with the right tools and knowledge.
5. Is it safe to continue driving with OBDII code P1490 (Nissan) triggered by an issue with the Vacuum Cut Valve Bypass Valve?
- It is not recommended to drive with this code active, as it can lead to further engine problems and potential breakdowns.
6. How much does it typically cost to repair OBDII code P1490 (Nissan) involving the Vacuum Cut Valve Bypass Valve?
- The cost can vary depending on the exact issue, but repairs related to this code may range from $100 to $500, including parts and labor.
7. Can resetting the OBDII system clear OBDII code P1490 (Nissan) associated with the Vacuum Cut Valve Bypass Valve?
- While resetting the system may temporarily clear the code, it's important to address the underlying issue to prevent it from reoccurring.
8. Are there any preventative maintenance tips to avoid encountering OBDII code P1490 (Nissan) due to problems with the Vacuum Cut Valve Bypass Valve?
- Regularly inspecting and maintaining the vacuum system components, such as the bypass valve and vacuum lines, can help prevent issues leading to this code.
9. Does OBDII code P1490 (Nissan) related to the Vacuum Cut Valve Bypass Valve affect vehicle emissions?
- Yes, this code can impact emissions performance, potentially leading to increased pollution and a failed emissions test.
10. How long does it typically take to repair OBDII code P1490 (Nissan) caused by a malfunctioning Vacuum Cut Valve Bypass Valve?
- Depending on the complexity of the repair and availability of parts, fixing this issue may take anywhere from a few hours to a day at a repair shop.
Discuss the causes and fixes for P1490 Nissan OBDII Code
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iam reciving this code on my 1999 nissan altima gxe and dont know where to start. it is also showing codes p0325,p0440,p1448. if that helps any. i just dont know where to start and need a little push in the right direction. thanks.
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Start by erasing all the codes and work with the one that comes back first. You should also check the canister and make sure is not damage.
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p1490 code 2001 nissan exterra 3.3l electrical issue between bypass cut valve and engine control module any advice how to fix
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This code is for the vacuum cut solenoid valve. Here is how to check the valve:
Using jumper wires, apply battery voltage between vacuum cut valve by-pass valve terminals. See Fig below. Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow between ports "A" and "B". Vacuum cut valve by-pass valve should switch in one second or less. If operation is not as specified, replace vacuum cut valve by-pass valve and retest system.
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