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broken and burnt ecu piece

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    broken and burnt ecu piece

    I couldnt figure out whether to put this here or electronics but I figured this was the more relevant section.

    I opened up my ecu because I was curious as to what was inside and found this burnt up piece. It's also almost cracked in half. I ran the ecu in my car and it seemed fine. I never had any issues with it but I only ran it for about 2000 miles.

    Anyone have any idea what it is and what kind of problems it could cause?






    I wish I could trade my heart for an extra liver, just so I can drink more and care less.

    #2
    It's a transistor. What it does, I couldn't tell you. At least in regards to the CB. Maybe EGR?

    YouTube Clicky!!

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      #3
      Yes its a transistor, its basically like a little switch. A small current flow allows it to control a larger current flow. Blowing up like that looks like it shorted out. Id say its pretty easy to fix. but it looks like some of the traces on the board got fried too and thats a bitch to fix and count on being reliable. Im not sure what that portion of the board controls, but you need to figure out whats up with the wiring in the car that caused that or your replacement is going to do the same thing.

      I dont know if its the lighting of the camera, but some other components look like they been stressed too. Just south of that..The yellow polyester capacitor looks damaged (above R112) R112 and the diode D19 looks to have been heated up too. Jumper NF4 looks to be fried a bit also..

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        #4
        If that resistor is connected to the transistor it's more than likely done. Clean the soot off the board and look for discoloration on the components illinois_erik mentioned. If you can, try to trace one of the legs of the transistor back to the pins on the ECU. Find out which pin is connected to the transistor and you can just look up what that pin does.

        I like to think of transistors as relays personally.

        YouTube Clicky!!

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          #5
          sounds like Q31, they blow frequently, when your wiring is incorrect for certain things.
          Can you tell s exactly which it is?

          Also check your IAT I am willing to bet the plastic is melted on the tip.
          MadLab Racing
          Southern Maryland


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            #6
            I'll take another look inside in just a bit here. I'm going to be pulling the engine back out of the car in a few days here so I'll go over all of the wiring again. I never ran the egr, and pretty much everything went smooth as far as the swap went. Only problem I had was I switched the oil pressure and knock sensor wires on accident.

            I wish I could trade my heart for an extra liver, just so I can drink more and care less.

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              #7
              tat shouldn't matter that transistor if q31 controls evap system and
              reflects its results to the IAT when discharged. If you get a surge on idle
              you might wanna examine that sensor.

              besides that it should operate fine.
              MadLab Racing
              Southern Maryland


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                #8
                I had an intermittent hesitation every once in a while after running the car for a while and it getting nice and hot. No idle issues though.

                I wish I could trade my heart for an extra liver, just so I can drink more and care less.

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                  #9
                  that happens when you plug the IAT connector into the evap purge solenoid.
                  www.850fab.com
                  IG - @850Fab
                  FB - @850Fabrication

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                    #10
                    I was able to trace it back to a pin. Assuming I had the ecu facing the right direction it's pin 17 on connector A. The pinout I found on google says its for the IAB. If I had it facing the wrong direction its pin 9 and thats IAC

                    I wish I could trade my heart for an extra liver, just so I can drink more and care less.

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