G424F(FE) Service Manual Chapter 5. Engine Management System (EMS) 167
IAT (Intake Air Temperature)
Sensor
MAP sensor
The intake air temperature sensor (IAT Sensor),
built in to the MAT sensor, is a resistor-based
sensor detect the intake air temperature. According
to the intake air temperature information frim the
sensor, the ECM will control the necessary amount
of fuel injection.
Ciruit Diagram
MAP & IAT
sensor
3214
Sensor
power
B24
IAT
signal
B12
Sensor
ground
B1
MAP
signal
B18
E C M
IAT
MAP
Sensor Inspection
1. Using a multimeter, measure the IAT sensor
resistance between terminals 3 and 4.
Temperature
℃ (°F)
Resistance(kΩ)
0 (32) 4.5 ~ 7.5
20 (68) 2.0 ~ 3.0
40 (104) 0.7 ~ 1.6
IG.SW.ON
80 (176) 0.2 ~ 0.4
2. If the resistance deviates from the standard value,
replace the intake air temperature sensor
assembly.
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