Lotus Elise Service Notes page 253

Lotus Service Notes
Section EMN
EMN.9 - INTAKE AIR TEMPERATURE MA~n SENSOR
The intake air temperature (IAT) sensor is fitted into the inlet manifold tract of no.4 cylinder, and is a
transducer with a negative temperature coefficient, such that its electrical resistance reduces with increasing
temperature. Using this signal in conjunction with that from the MAP sensor, the ECM is able to determine the
air consumption of the engine, and adjust the injector pulse width accordingly for correct fuelling. Low air
temperature results in denser air requiring more fuel. High air temperatures are also used by the ECM to retard
the ignition timing and avoid knock.
To replace the sensor, unplug the electrical connector, and unscrew the sensor from the manifold. Before
fitting a sensor, clean the threads and mating face, and screw into the manifold, tightening to 7Nm. Mate the
harness plug.
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