ECT/IAT sensor voltages

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  1. #1
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    Default ECT/IAT sensor voltages

    I am in the process of developing a series of gauge products for 94-98 Mustangs and need a little data to make sure that they will work with 94 & 95 Mustangs. The first product will replace the clock with a color OLED module with Clock, ECT, IAT, Oil Pressure, Fuel Pressure and voltage displays.

    My 96 Ford Emissions Manual gives me the voltage and resistance specs for the ECT and IAT sensors. Based on that data, we can tap into the ECT and IAT sensor signals to show those values. I am hoping that the 94 & 95 PCMs use the same sensors and voltages.

    I dropped by the local Ford dealer today, and they told me that, when Ford put all this data on-line for their mechanics, they threw out all their old hard-copy manuals, and now Ford no longer has that kind of information on-line for their mechanics. He seemed pretty disgusted and felt bad he could not help me.

    So I need someone with the equivalent of my 96 emissions manual to tell me what the specs are for the 94 & 95 Mustangs.

    For completeness, here is the data for the 96-98 cars:

    96 Ford IAT/ECT Sensor Data
    *F *C Volts K Ohms
    248 120 0.27 1.18
    230 110 0.35 1.55
    212 100 0.46 2.07
    194 90 0.6 2.8
    176 80 0.78 3.84
    158 70 1.02 5.37
    140 60 1.33 7.7
    122 50 1.7 10.97
    104 40 2.13 16.15
    86 30 2.6 24.27
    68 20 3.07 37.3
    50 10 3.51 58.75

    Thanks in advance.

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    Senior Member Array Magic's Avatar
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    Sounds like a product I might be interested in for my 95.

    I'll dig around to see if I can find any info for you.

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    I found this in another forum, where a guy asked a question regarding his 94 mustang GT.


    Also I did some part number cross reference, they are the same sensors as used on the foxbody for a 94-95 5.0L.
    Last edited by Magic; 12-01-2012 at 08:54 PM.

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    This is great information. Thanks for the data. It proves that the sensor is the same from an electrical perspective. Assuming the 94 & 95 PCMs use the same pullup resistors, (highly likely) then the circuit can be the same for 94-97 cars.

    I have the software nearly done, and am starting to build a prototype. It is much easier software than the make-the-gauges-real circuit I am also still working on.

    Mark
    Last edited by markolson; 12-02-2012 at 12:40 AM.

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