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.
The IAT
(brass tip - may also be resin
tipped & more rounded)
<< sensor end
wiring connector end >>
Needed:
Tools:
13mm sockets & ratchet,
or 13mm wrench
Needle nose pliers
(angled tip if you have them)
Parts:
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)
Location
On most S-Series, the IAT
sensor is in a tube in front of the air filter box.
As you're standing in front of the car, look at the
corner of the air filter box to the right & close to
you. The tube comes from this corner, and the IAT
is screwed into that tube.
Replacement
1. 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.
2. Unscrew the IAT using
the 13mm socket or wrench. Loosens counterclockwise
(normal thread direction).
3. Install is reverse of
removal. No need to tighten very tight.
