maximomo

iTrader: (2)

I think I remember reading the air temp sensor is 2.1 to 2.9k ohms at room temp and it goes down from there as the temp goes up. Mine reads 1.2k ohms at room temp and then goes down when I spray it with freeze spray.

Anyone have the exact spec on this? Thanks

Kevlo911

iTrader: (36)

0401
Diagnostic Trouble Code 0401 points to a problem with the Intake Air Temperature Sensor. The IATS is mounted in the engine air intake duct, downstream of the air cleaner filter. It detects intake air temperature and transmits a signal to the Engine Control Module. The sensor uses a thermistor, a resistor with a value which is inversely proportional to temperature. The IATS is not directly used to control the engine. It is used only for diagnostic purposes. Therefore the engine should start and run normally, even with the Malfunction Indicator Light on and DTC 0401 stored.
This malfunction is detected when ...
a) An excessively low or high voltage from the sensor is detected by the ECM.
b) The signal from the IATS is inconsistent with the signal received from the Engine Coolant Temperature Sensor.
Possible causes include ...
- Harness or connectors (The sensor circuit is open or shorted.)
- a faulty Intake Air Temperature Sensor
The IATS resistance values should be ...
- at 14 degrees F, 7.0-11.4 Kohms
- at 68 degrees F, 2.1-2.9 Kohms
- at 176 degrees F, 0.27-0.38 Kohms
For further information about the Intake Air Temperature Sensor please refer to the Chilton repair manual (page 4-16) or the Haynes repair manual (page 6-11).

maximomo

iTrader: (2)

Thanks, Mine isn't registering an ECU code but it IS definitely bad.

I replaced it with a 2.2k ohm resistor and man o man what a difference in performance and consistency. I guess I need to find one online for cheap!

tho, with 146k miles on my car I might just leave the $.25 resistor in instead of paying $50 for ATS.