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ECMlink Problem with GM IAT and DSMLink v3lite

Posted by jmorri15, Dec 31, 2018

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  1. jmorri15

    jmorri15 Proven Member

    63
    0
    Joined Mar 6, 2009
    Kemp, Texas
    So I have been trying to figure out why my IAT sensor is only showing -40 degrees, it has been a problem since I started going through everything to get my car back onto the road. I have narrowed it down to what I believe is something in my ECU. I replaced the old HKS IAT with a brand new GM IAT sensor a week ago and just applied 12v power to the car after 6 years Saturday. The wiring under the hood is pretty rough so I have been cutting and replacing connectors that are frayed and baked. The old IAT sensor looks like it was shorted and broke almost as soon as I moved the cable.

    Here is what I have tested so far

    I tested the resistance of the IAT sensor and I am getting up and down from 1.3-2.8 ohms when running a hairdryer across it. I have checked the wiring and I good continuity and have no resistance from the sensor to the ECU. When I look at the wiring diagram it seems to say that I should see 5v across the sensor when it is plugged in, but when I probe it I am seeing no voltage.


    Any thoughts you might have would be awesome.
     
  2. thomcasey

    thomcasey Proven Member

    949
    25
    Joined Dec 16, 2009
    Indianapolis, Indiana
    I am having this exact same issue. Did you ever get it figured out?
     

    Street Build 334  2

    1992 Mitsubishi Galant VR-4
    awd · manual · Galant VR-4
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  3. jed344

    jed344 Supporting VIP

    986
    151
    Joined Jan 10, 2008
    Waterville, Iowa
    Is it configured correctly in ECM link? I have my GM iat logged to Baro pressure input.
     

    1K  38

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  4. thomcasey

    thomcasey Proven Member

    949
    25
    Joined Dec 16, 2009
    Indianapolis, Indiana
    Yes, it is. Not sure what is going on with it, but I found that the problem with the car running right was actually being caused by the crappy OmniPower 4-Bar MAP sensor that cam in the ECMLink kit. I removed it and replaced it with an AEM 3.5 bar and she is back to normal.
     

    Street Build 334  2

    1992 Mitsubishi Galant VR-4
    awd · manual · Galant VR-4
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