Question about 2008 Skoda Octavia 1.9
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What is it? The intake air temperature sensor
is small electrical device (Thermistor - temperature dependent resistor) that
consists of a small bead on a loop of wire held within a plastic safety frame.
Where is it located? Is most often found associated with the MAF
(AMM) in the air ducting immediately after the air filter/cleaner box. On cars without a MAF (a manifold pressure
sensor usually takes on the role) the IAT may be sited nearer the throttle
opening in the air ducting. It has only
two wires that make connection with it.
However, when located with the MAF, a combined multi-pin plug will serve
How does it work? It measures the
intake air temperature by simply measuring the resistance in the thermistor bead on the wire. The IAT is
most commonly located alongside the MAF.
The IAT thermistor sends a signal proportionate to the air temperature
(if the usual NTC thermistor the resistance drops with increasing temperature;
if PTC type them resistance increases with increasing temperature). With the
engine running, fresh air is drawn through the ducting and cools the heated MAF. The temperature of the air, in conjunction
with its ability to cool the MAF allows the ECU to determine the mass of air
entering the engine and thereby to select the appropriate amount of fuel to use
by altering the injection times.
Symptoms of a faulty IAT
How to Check?
Unplug the device from the duct and check that it is clean. Put a voltmeter across the contacts and
measure the resistance due to the ambient air temperature. If you then breathe on it, raising the local
air temperature around the probe, you will see the resistance change as a
consequence. You are looking for a change
in resistance in line with a change of air temperature. If there is infinite resistance, consistent
with a broken circuit, or there is no measurable response to change in air
temperature then the IAT is faulty.
How to Fix? Replace it
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