Cummins 4944845 Boost Pressure Temperature Sensor Assembly

The Cummins 4944845 is an integrated intake manifold absolute pressure (MAP) and intake air temperature (IAT) sensor, commonly referred to as a TMAP sensor. It provides real-time boost pressure and temperature data to the engine control module (ECM) for precise fuel injection timing and air-fuel ratio control on common rail fuel systems. Designed for Cummins QSB3.3 Tier 3 and Tier 4 electronic diesel engines, this sensor features a 5 VDC reference voltage supply and a ratiometric 0.5 to 4.5 VDC output signal proportional to absolute pressure. The sensing element utilizes piezoresistive technology for pressure and a thermistor for temperature. It mounts directly into the intake manifold via an M12 x 1.5 thread with a sealed 4-pin Bosch-type electrical connector.