Code Definition

P1490 — EVAP Vacuum Cut Valve Bypass Valve

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

About P1490

P1490 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti 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

DTC P1490 relates to the electrical circuit of the EVAP vacuum cut valve bypass valve on these Nissan and Infiniti vehicles. The vacuum cut valve bypass valve is a solenoid fitted in parallel with the vacuum cut valve in the line between the fuel tank and the charcoal canister, and the Engine Control Module (ECM) operates it during the evaporative leak diagnosis. This code is set when the ECM detects an improper voltage in the bypass valve control circuit, which indicates an open circuit, a short or a failed solenoid winding rather than a flow or equalisation problem. The companion function co...

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