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ECMlink [HELP ASAP] IC 112 Blew in my ECU. Why? What does it control? ISC tested "ok"

Posted by kmetiuk, Jun 22, 2019

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  1. kmetiuk

    kmetiuk Proven Member

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    Joined Mar 10, 2010
    Edmonton, AB, Canada
    IC 112 appears to be blown in the ECU. I checked the ISC motor and I get 38-40 ohms which I believe is high but I dunno.

    I have 2 more spare ECUs but I don't want to blow them either.

    I removed resistor 39 to add an extra input. In my haste last year trouble shooting what turned out to be a blown turbo to exh mani gasket, I swapped ECUs and forgot to remove that resistor 39.

    I dunno why it blew or what that IC112 does but any info would be great.

    ECU ICfired SMALL.jpg
     

    Road Race Build 1K  1

    1997 Eagle Talon N/T
    manual · 2G DSM
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  2. motomattx

    motomattx Proven Member

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    wampum, Pennsylvania
    Check for resistance on your fuel pressure solenoid line and your boost control solenoid line (from your unplugged ecu harness to ground) and report back the resistance, there is a problem somewhere in one of those circuits unless that driver was already blown from another car.
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  3. steve

    steve DSM Wiseman

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    St. Charles, Illinois
    Is this for a Turbo 2G?

    Based on the picture I'd guess the PCB is marked JE331B677C and IC 112 controls the Boost Control Solenoid and the Fuel Pressure Solenoid.

    The IAC is connected to 106 and 107.
     

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  4. kmetiuk

    kmetiuk Proven Member

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    Joined Mar 10, 2010
    Edmonton, AB, Canada

    I will check those and report back in a bit. I am having issues getting the car started at the moment. The ECU did come from another car so its possible that it may have been blown. I have 3 EEPROM ecus and 2 are chipped for ECMLink so I have 1 for spare parts to fix this. But I really need to get the car started first. I'll disconnect the BCS and FPS not to be safe.

    I have a spare ECU so I am running that right now, but I think I have a bad CAS b/c I am only getting spark on only 1 coil. Both coils test in the right ohms for both primary and secondary coils. I also can see a voltage pulse when cranking. I swapped PTU's, ECU's, and coils and the problem is always only 1 set of coils is firing.

    I checked the signal wire from my 1G CAS and I found that I get 4 pulses of ~5V on the CPS signal wire and no pulses on the CAM signal wire.

    Also ECMLink was showing a DTC for the CAM sensor so I'm heavily leaning towards the CAS being bad. I have a diff one on the way so once that is here I and its fixed I will be back on to figuring this out.

    Thanks though. :D


    Its crazy, car sat for 2 yrs and then I had my OMNI 4 bar stopped working. The IC112 popped (although it was from an ECU I had never opened up before). AND the CAS seemed to have died. I just have elec gremlins right now and its making me crazy.
     

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    1997 Eagle Talon N/T
    manual · 2G DSM
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