Who knows Intake Air Temp (IAT) sensor?
#1
Who knows Intake Air Temp (IAT) sensor?
I have a CEL with the 0401 trouble code, which is for the Intake Air Temp (IAT) sensor.I'
I opened up my Haynes manual and the IAT is shown to be mounted on the top of the airbox (it doesn't get any more accessible than that). However, when I popped my hood and looked, the sensor isn't anywhere near where the manual illustrates. I can't find it to save my life.
I'm very confused. How can I trip a code for something that isn't there? Can anyone explain why the Haynes manual shows it in a place that isn't accurate? Any idea where the IAT sensor actually is?
Thanks.
I opened up my Haynes manual and the IAT is shown to be mounted on the top of the airbox (it doesn't get any more accessible than that). However, when I popped my hood and looked, the sensor isn't anywhere near where the manual illustrates. I can't find it to save my life.
I'm very confused. How can I trip a code for something that isn't there? Can anyone explain why the Haynes manual shows it in a place that isn't accurate? Any idea where the IAT sensor actually is?
Thanks.
#3
as far as i know 97 and up have the iats on the intake tube itself not on the filter box in order to change it you need to remove the filter box to have access to it but it seems its the same thing i'm expecting to receive my today
http://forums.maxima.org/showthread.php?t=510523
http://forums.maxima.org/showthread.php?t=510523
#4
the sensor is almost directly under the MAF. It's on the snorkel hose as it curves to the bottom of the air box. Take the top of the box off and you should see it. You should be able to see it look from the front of the car as well.
#5
shall i crawl out of bed and take a photo? not sure mine would help. mines just hanging around in the engine bay cable tied. its just a connector with a black thin piece of plastic.
#9
Senior Member
iTrader: (15)
Join Date: Oct 2004
Location: NY (somewhere between Queens & BK)
Posts: 2,122
I tripped the same code. I think mines fell into my engine bay. lol Since the temps will warm up tomorrow, I will get in their to locate.
But as everyone said, it plugs directly into intake airbox (or aftermarket filter for others). Mines came out as there was never a connection for the sensor in the crappy filter I bought.
But as everyone said, it plugs directly into intake airbox (or aftermarket filter for others). Mines came out as there was never a connection for the sensor in the crappy filter I bought.
#11
from the inside of the upper air box (above the filter) there is a small thing that is protected by a round piece of plastic. If you look closely, it looks like a small electrical resistor encased in glass. That's because it basically is. It's called a thermistor, and works by temperature changing it's ability to resist current.
#12
in this thread i posted pics of the 2 different iat available for our cars the one that goes on the airbox or the one that goes below the maf
http://forums.maxima.org/showthread.php?t=510523
http://forums.maxima.org/showthread.php?t=510523
#16
Originally Posted by wayman
I have a CEL with the 0401 trouble code, which is for the Intake Air Temp (IAT) sensor.I'
I opened up my Haynes manual and the IAT is shown to be mounted on the top of the airbox (it doesn't get any more accessible than that). However, when I popped my hood and looked, the sensor isn't anywhere near where the manual illustrates. I can't find it to save my life.
I'm very confused. How can I trip a code for something that isn't there? Can anyone explain why the Haynes manual shows it in a place that isn't accurate? Any idea where the IAT sensor actually is?
Thanks.
I opened up my Haynes manual and the IAT is shown to be mounted on the top of the airbox (it doesn't get any more accessible than that). However, when I popped my hood and looked, the sensor isn't anywhere near where the manual illustrates. I can't find it to save my life.
I'm very confused. How can I trip a code for something that isn't there? Can anyone explain why the Haynes manual shows it in a place that isn't accurate? Any idea where the IAT sensor actually is?
Thanks.
#17
Originally Posted by i30krab
sensor isn't really important. I just attached it near the MAF and that's it. No codes, nothing!
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).
#18
Originally Posted by ny240gtr
if you to a local pep boys or auto zone ask one of the mechanics there am pretty sure they will find it for u just ask them for help
Originally Posted by i30krab
According to JWT, Intake Air Temp (IAT) sensor isn't really important. I just attached it near the MAF and that's it. No codes, nothing!
and like everyone else said, IAT is on the tube leading up to the airbox.
#19
Originally Posted by willard00
and like everyone else said, IAT is on the tube leading up to the airbox.
Thread
Thread Starter
Forum
Replies
Last Post