Hi folks,

I just put new main bearings in my 1998 Grand Caravan 3.3. It's running great except it's a little hard to start. It's throwing a code 23 which says the Intake Air Temperature sensor isn't working. I can't locate the darn thing! I've looked everywhere, but I can't find it. Does anyone out there know where I should look?

Jim

 

that seems to be an erroneous code. clear codes and re-test. use a real scanner to see what P code you are getting

 

Same problem here (my post is a few below yours). According to Haynes manual, there is no IAT sensor on a 3.3L, only 4 cylinder. What the code means is the sensor voltage is too high or too low. If you figure this out, keep me posted.

 

@ sapparo, I have been searching for a solution to this for about a week and it seems a lot of others have been getting this code, but no one has come up with an answer that I have found. Maybe it's translation is incorrect is what I was thinking.

It has to be something close to that though I would imagine. My 2000 3.3L flex is using way too much fuel, black smoke really bad. Gas MPH drops to about half what it should be. My vehicle, it's not doing it all the time. It comes and goes. But it is doing this very often and more often than not the problem is happening. Seems to run better after removing battery cable for about 5 minutes (resetting computer) then it gradually runs bad more and more often. I'm thinking bad connection (in my case), but I need to figure out where the bad connection is. If anyone solves this code, please post!!!

 

a quality scanner would be best to read data and see what the computer is seeing.

 

I didn't use a code scanner to pull the codes. I used the on board computer by depressing the trip and reset buttons. It gave me a 23 code and a 55 code. I then used http://www.allpar.com/fix/80s-codes.html to look up what they mean. 55 is "end of codes". 23 is "Incoming air temperature sensor may be bad". Other descriptions for 23 say the voltage is high. Apparently this sensor is sometimes called a "manifold air temperature" sensor. A MAT. I see a sensor mounted in the intake manifold. Tomorrow, I think I'll pull it and see if cleaning it helps.

Jim

 

Cool, I just ran into the same info. It's actually the MAP sensor, but that is right part. Let me know how it goes. I'll try the same on my ride.

 

Reap70,

Not a MAP sensor. That stands for Manifold Absolute Pressure and is typically mounted on the firewall. This would be a MAT... Manifold Air Temperature.

In either case, I'll let you know what I find out.

Jim

 

there is no manifold temp sensor either. infact IAT is the official OBD II term used for measuring intake air temp.

the best way to determine this problem is to use a real scanner, monitor actual data and see what values are at the sensors, along with actual P---- codes. the old generic 2 digit codes are very ambiguous.

 

Ya, I couldn't find a MAT sensor in the Haynes. That's why I assumed you meant the MAP sensor. BTW, according to Haynes, the MAP sensor is on the side of the intake manifold plenum and the PCM uses the MAP sensor to control fuel delivery to the ignition timing. The PCM will receive info as a voltage signal. I haven't been able to check mine yet, but this sounds like it may be a good place to check. I am not an expert, so take my advice with a grain of salt. LOL What do you think sapporo or someone else?