Code Definition

P1490 — EVAP Vacuum Cut Valve Bypass Valve

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Nissan

About P1490

P1490 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1490 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On Nissan vehicles the EVAP vacuum cut valve bypass valve works alongside the vacuum cut valve to manage how the fuel tank and evaporative emission (EVAP) system are sealed and tested. The Engine Control Module (ECM) operates the bypass valve so the system can be evacuated and checked for leaks during the EVAP diagnostic. DTC P1490 sets when the ECM detects a fault in the vacuum cut valve bypass valve circuit, such as an open or a short, so the commanded state and the measured circuit do not agree. Symptoms are usually limited to the check engine light, since the valve relates to the EVAP self...

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