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Anyone ever replace their MAT sensor? by Kitskaboodle
Started on: 05-18-2014 12:29 PM
Replies: 4 (358 views)
Last post by: Blacktree on 05-18-2014 06:19 PM
Kitskaboodle
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Report this Post05-18-2014 12:29 PM Click Here to See the Profile for KitskaboodleClick Here to Email KitskaboodleSend a Private Message to KitskaboodleEdit/Delete MessageReply w/QuoteDirect Link to This Post
Just curious if anyone out there has ever replaced their MAT sensor? This is the sensor that screws into the side of the air cleaner housing. This sensor is not often talked about here on the Forum as far as I know. Did you did replace yours and if it fixed your drivability issue, what was that issue? Lastly, how do you test a MAT?
Thanks, Kit
P.S. 4 cyl Fiero's don't have the MAT sensor.

[This message has been edited by Kitskaboodle (edited 05-18-2014).]

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phonedawgz
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Report this Post05-18-2014 12:49 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
You can scan the ECM and see what the MAT reading is compared to actual temperature.

You also can read the resistance of the sensor and compare it to this chart.


Yes CTS and MAT use the same response curve.
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Kitskaboodle
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Report this Post05-18-2014 01:04 PM Click Here to See the Profile for KitskaboodleClick Here to Email KitskaboodleSend a Private Message to KitskaboodleEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for the chart.
I was just reading one of my "other " Fiero service manuals (a Haynes manual I paid two bucks for) and it said you can check the voltage signal going from the MAT to the ECM and it should be 4 volts. Does that sound correct? Just trying to gather all the tests that can be done to verify the MAT sensor is working correctly.
Thanks, Kit
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theogre
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Report this Post05-18-2014 05:55 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Kitskaboodle:
P.S. 4 cyl Fiero's don't have the MAT sensor.

Wrong. 87 & up L4 Does.

V6 MAT connections and wires can corroded etc make an iffy reading cause problems w/o setting Any DTCs.
You can try testing w/ above chart but don't hold your breath.

See my Cave, Sensors Quick Ref


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Blacktree
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Report this Post05-18-2014 06:19 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post
You can also check the MAT sensor resistance with an Ohm meter. Unplug the wires, and probe the two terminals. Then compare to the chart above. It should correspond roughly to the ambient air temperature.

I had to replace the MAT sensor on my V6 once, because the reading was WAY high. We're talking sensor readings around 140°F, when it's only in the low 70s outside (cold engine). That made the engine run lean, which made it surge and sometimes stall when idling. The bad behavior happened mostly when the engine was cold, because the O2 sensor wasn't active yet.

[This message has been edited by Blacktree (edited 05-18-2014).]

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