AutoCodes – Infiniti – P1490 Infiniti

P1490 Infiniti 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 Infiniti 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.

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Code Popularity 14,015

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1490 Infiniti 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 Infiniti - Vacuum Cut Valve Bypass Valve - AutoCodes.com — P1490 Infiniti Code - Vacuum Cut Valve Bypass Valve

What does this mean?

What are the Possible Causes of the DTC P1490 Infiniti?

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 Infiniti?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1490 Infiniti 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 Infiniti code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.