Manifold Pressure/Vacuum Sensor: Description and Operation
THERMAL MANIFOLD ABSOLUTE PRESSURE SENSORThermal Manifold Absolute Pressure (TMAP) Sensor:
The Thermal Manifold Absolute Pressure Sensor (TMAP) (Figure 48) consists of a manifold absolute pressure (MAP) sensor and an integrated thermistor. The MAP portion of the sensor uses a piezo-resistive silicon sensing element to provide a voltage proportional to the absolute pressure in the intake manifold. The thermistor portion of the sensor operates in the same manner as an intake air temperature (IAT) sensor. For additional information on how the IAT sensor operates, refer to the Intake Air Temperature Sensor description and operation.
For the 2.3L Ranger and 2.3L PZEV Focus, the TMAP sensor is part of the Exhaust Gas Recirculation (EGR) system. The PCM uses information from the MAP portion of the TMAP sensor, throttle position (TP) sensor, mass air flow (MAF) sensor, engine coolant temperature (ECT) sensor or cylinder head temperature (CHT) sensor and crankshaft position (CKP) sensor to determine how much exhaust gas is introduced into the intake manifold. The thermistor portion of the TMAP sensor is currently not being used on this application.
For the 4.6L SC Mustang, the PCM uses manifold absolute pressure information from the MAP portion of the TMAP sensor along with other sensor inputs to determine the proper amount of fuel needed for combustion under varying engine load conditions. The thermistor portion of the TMAP sensor is used as a second IAT sensor. This second IAT sensor, located after the supercharger, provides manifold air temperature information to the PCM.