AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 296)

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© 2014 AEM Performance Electronics
Infinity User Manual
IAT (Inlet Air Temperature)
Manifold Air Temp Sensors (MAT) and Inlet Air Temp Sensors (IAT) are variable resistance
thermistors that send a return voltage signal back to the ECU based on the inlet air temp either in
the inlet manifold or in the inlet duct to the throttle body. The ECU outputs a +5V power to the
sensor and the return voltage is based on the resistance of the sensor. These sensors are also
used as auxiliary temp sensors for any air temp measurement, such as intercooler inlet and outlet
temps.
The AEM Infinity is compatible with virtually all MAT & IAT sensors. Based on the inlet air temp
readings provided by an MAT or IAT, an ECU can add or subtract fuel or ignition timing
depending on the given conditions. For example, a typical use for an IAT sensor is to change the
ignition timing and fueling of an engine based on inlet air temp. This is particularly useful on
forced induction engines where inlet air temps can increase dramatically.
For more information, go to Air Temperature 96