Code Definition

P1131 — Intake maniflld air control solenoid fault

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

About P1131

P1131 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.

P1131 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

The swirl control valve system improves combustion stability and emissions at low engine speeds by closing butterfly valves in the intake manifold runners, which increases the swirl of the incoming air charge. The swirl control valve control solenoid valve is operated by the Engine Control Module (ECM) and switches intake manifold vacuum to the swirl control valve actuator. DTC P1131 is set when the ECM detects an improper voltage signal in the solenoid valve control circuit, indicating the solenoid is not responding correctly to the commanded on or off state. When this code is set the driver ...

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