A little more simple please!!
Or to Harbor Freight where they are constantly on sale for
$3.99.
Get yourself a couple of sewing needles. Push them through
the insulation of the wires on both sides of the IAT sensor.
Measure the voltages of both wires against the nearest
sheet metal ground point.
If the two sides are different voltages, like 0 and 1-2V, it's
good. If one side is 0 and one is 5V, the sensor or its
connector has the open circuit. If both sides are +5V or
more then the low side (PCM REF) is open. If both sides
are low (0V) then the high side (IAT) is open.

