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P1490 Nissan Code - Vacuum Cut Valve Bypass Valve

- Code Popularity: 78,000 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1490 Nissan?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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
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How to Fix the DTC P1490 Nissan?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

There is a factory service bulletin for the following Nissan models:

2002 Nissan Altima
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2002-2005 Nissan Altima Service Bulletin OBDII Code P1490

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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. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

An improper voltage signal is sent to ECM through vacuum cut valve bypass valve.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code 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 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.

OBDII Code P1490 Nissan - Vacuum Cut Valve Bypass Valve - AutoCodes.com
P1490 Nissan Code - Vacuum Cut Valve Bypass Valve

Need More Information on the Code?

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Information for Specific Nissan Models

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Code P1490 Nissan comments

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