37830-RNA-A01 Map Sensor Assembly - Overview. The 37830-RNA-A01 Map Sensor Assembly is an essential component in the Honda fuel management system. It supports the engine's electronic control unit (ECU) by accurately measuring the manifold absolute pressure (MAP), playing a vital role in optimizing the fuel-air mixture for superior engine efficiency and performance. This sensor is integral to maintaining the reliability and smooth operation of Honda marine engines and vehicles within its compatib