37830-PNC-003 Map Sensor Assembly - Overview. The 37830-PNC-003 Map Sensor Assembly is an essential component within Honda marine engine systems, responsible for accurately measuring the manifold absolute pressure. This sensor delivers crucial data to the engine control unit (ECU), facilitating accurate fuel injection and ignition timing for peak engine efficiency and reliability. Engineered as a genuine OEM part, it ensures seamless integration with your Honda marine engine parts, maintaining o