Engine-Codes - Nissan - P1490 2003 NISSAN ALTIMA SEDAN

P1490 2003 NISSAN ALTIMA SEDAN - Vacuum Cut Valve Bypass Valve

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1490 2003 NISSAN ALTIMA SEDAN Possible 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

How is the P1490 2003 NISSAN ALTIMA SEDAN code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

There is a factory service bulletin for the 2003 Nissan Altima:
2003 Nissan Altima Factory Service Bulletin OBDII Code P1490

What is the cost to diagnose the P1490 2003 NISSAN ALTIMA SEDAN code

Labor: 1.0

The cost to diagnose the P1490 2003 NISSAN ALTIMA SEDAN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?

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

Possible Symptoms

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

P1490 2003 NISSAN ALTIMA SEDAN Meaning

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.

More Information

Need more information on how to fix the P1490 2003 NISSAN ALTIMA SEDAN code?
Get Access to Factory Service Manuals

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