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Discussion Starter #1
I have a 1995 Camry LE Wagon v6 3.0L (1MZ-FE). About 248k miles.

A couple of days ago I did some long-overdue maintenance, including changing the air filter, which was very dirty.

Today the Check Engine light came on. For months (if not years), it's been going on for a few days to a few weeks, then off for a similar amount of time.

Pulled these codes at Auto Zone:

P0100 Intake Air Temperature Sensor 1 Circuit
P0100 Mass or Volume Air Flow Circuit

Their "report" said the most likely solution is to replace the Intake Air Temperature sensor.

They suggested an "Air Charge Temperature Sensor", which I just now learned is another name for IAT sensor. (I tried to include a link to the part, but apparently that's prohibited because it's my first post.)

Where is this located on the engine?

So far I haven't found it after searching the web and my old Chilton manual.

I'm a total newcomer to this kind of repair.

Adding to the confusion, in another thread here, someone said the IAT is part of the MAF sensor assembly in the V6. And the Chilton diagram showing the IAT location in the 5S-FE engine (on the side of the air cleaner housing) says "others similar" when in fact the 1MZ-FE is different.

I checked the air intake hose downstream of the air cleaner housing but didn't see anything.

Any help would be much appreciated.

Thanks!

Bob
 

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Discussion Starter #2
I've found further posts at other sites saying that the IAT sensor is integrated into the MAF sensor. One page, describing a 1994 Toyota 4x4 pickup with the 3.0L V6, includes a diagram of the wire connector and says that the wire on the far right, labeled THA, is the IAT sensor.

If that's true, then what is the Air Charge Sensor that AutoZone is recommending? Is that info simply incorrect?
 

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The IAT sensor can either be inside the air filter box or incorporated in the MAF.

If you don't see it in the air filter box then it's with the MAF. Can't say if i the MAF if it will be a separate part. I'd go to the dealer parts counter and get them to show you the parts blow-up/location.
 

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Discussion Starter #4
I found Toyota service manual (1MZ-FE engine). It says: "The intake air temp. sensor is built into the air flow meter and senses the intake air temperature."

It also says:

The code P0110 is "Open or short in intake air temp. sensor circuit". It could reflect a problem with the sensor, which would require replacing the whole MAF; or the wiring harness (which could be repaired or replaced); or the ECM (which could be replaced).
 
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