4. Fuel Injection System
4-9
Manifold Absolute Pressure Sensor (MAP Sensor) / Engine Coolant Temperature
Sensor (TW Sensor) / Intake Air Temperature Sensor (TA Sensor)
TW Sensor / TA Sensor:
Using negative temperature coefficient thermistor, TW Sensor and TA Sensor measure outside
temperature. As heat goes up, resistance goes down; resistance goes up as temperature goes down,
providing ECU temperature signals to determine the fuel injection quantity and ignition timing.
MAP Sensor:
MAP Sensor uses the piezoresistive resistor composed of silicon diaphragm, forming the Wheatstone
bridge circuit to measure the atmospheric pressure and the intake manifold pressure, which are both
transmitted to ECU for reference of engine control.
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