Author: Jonathan Swain (aka "PurdueGuy")
IAT = Intake Air Temperature sensor
The IAT sensor is a thermistor – that is, it’s a resistor that changes resistance with temperature. The resistance level tells the PCM the coolant temperature. The ECTS (engine coolant temperature sensor) and the IAT (Intake Air Temperature) sensor are the same part.
(brass tip – may also be resin tipped & more rounded)
<< sensor end wiring connector end >>
- 13mm socket & ratchet, or 13mm wrench
- Needle nose pliers (angled tip if you have them)
New IAT (brass or resin tip should work fine. The brass tipped is highly recommended for use for the ECTS, but the IAT does not get put to the same abuse, so either style works fine)
Remove the wiring connector. Use your fingers or the needle nose pliers to squeeze the connector, releasing the tabs. Gently pull the connector from the sensor.
Unscrew the IAT using the 13mm socket or wrench. Loosens counterclockwise (normal thread direction).
Install is reverse of removal. No need to tighten very tight.