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Thread: CEL code 41 - injector fault

  1. #1
    Regular Member Spider-Dan's Avatar
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    CEL code 41 - injector fault

    I got a Check Engine Light and noticed that the car was running a little rough. I hooked up my datalogging program and it reported a stored code of 41 - Injector Fault.

    I did a little bit of searching on 3SI and it seems like this is "usually" the ECU, but I'm not sure how to go about testing. Any suggestions or recommendations for a shop to do the work?

  2. #2
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    Re: CEL code 41 - injector fault

    Most likely the ecu. The best test is to open up the ecu and look for capacitor leaks. I probably have a three or two with pictures of what that looks like.

    Anyone who is decent with a soldering iron can fix it. There's a thread on 3si about how to do. I did one myself. It wasn't pretty (and I highly suggest a good soldering iron), but it's still running after 6 months.

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    Senior Member JimVR4's Avatar
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    Re: CEL code 41 - injector fault

    95 ECUs rarely get the leaking capacitor problem but they can get blown out by a bad IAC. I recommend testing the IAC per Jeff L:

    http://www.stealth316.com/2-isc-iac.htm


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  4. #4
    Regular Member Spider-Dan's Avatar
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    Re: CEL code 41 - injector fault

    I tested the IAC and it checked out fine. I ended up sending my ECU to 3SX for a rebuild. I'll report back on how it turns out.

  5. #5
    Regular Member Spider-Dan's Avatar
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    Re: CEL code 41 - injector fault

    Got the ECU back from 3SX. I hadn't driven the car for quite a while, and part of the ECU PCB was badly damaged and needed to be replaced. So the rebuild was initially $425, and it was an additional $195 to replace the sub-board.

    Reinstalled the ECU, and the car is running great. No CEL codes.

  6. #6
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    Re: CEL code 41 - injector fault

    Do you know what damaged it or how it was damaged? Maybe water?
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  7. #7
    Regular Member Spider-Dan's Avatar
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    Re: CEL code 41 - injector fault

    Leaking capacitors. They are only rated for a certain number of hours, so it is less of an if question and more of a when.

    If you catch it early (like, right when you get the code) then you can replace them before the PCB is damaged. But my car was sitting in the garage from November to April.

  8. #8
    Senior Member JimVR4's Avatar
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    Re: CEL code 41 - injector fault

    Strange. First case I've heard of a 95 ECU failing from capacitor leakage. Glad you got it sorted out


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    Re: CEL code 41 - injector fault

    Yeah I restore vintage electronics as my other hobby and much of it has electrolytic caps from long, long ago. They do have a tendency to drift out of tolerance and with substantially increased ESR. However most of the time the equipment will still function. These are electrolytics from the '70s! So it makes me wonder whether (A) the caps mitu's supplier used were simply inferior in (1) manufacturing or (2) specification, or (B) whether there are other special considerations - like maybe a caustic glue used in assembly - that lead to the demise of the caps.
    Il faut voir pour savoir

  10. #10
    Senior Member JimVR4's Avatar
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    Re: CEL code 41 - injector fault

    Principal reasons were:

    The capacitor plague of 1999–2002 – an attempt to reproduce a stolen Rubycon Inc.’s formula for electrolyte, which went bad.
    Otherwise changing composition of electrolyte; more H2O (useful to obtain lower ESR) makes it more corrosive.
    Cost optimization due to increasingly mass production of electronics.
    Errors in design, process, or low-quality materials; bad quality control.


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    Re: CEL code 41 - injector fault

    Thanks Jim ... which manufacturers were the culprits? Any particular product lines?
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  12. #12
    Senior Member JimVR4's Avatar
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    Re: CEL code 41 - injector fault

    Ryan - there are a few cited in this article:

    https://en.wikipedia.org/wiki/Capacitor_plague


    1995 3000GT Spyder VR4
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  13. #13
    Senior Member RealMcCoy's Avatar
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    Re: CEL code 41 - injector fault

    Wow, guess I showed up late for the party... Glad you got it fixed. It is pretty uncommon to see a 94-95 ECU fail like that, but as was just proven, it can happen...
    Quote Originally Posted by RealMcCoy
    Apparently your mechanic isn't familiar with the mitsu secret decoder ring that translates injector codes to "I have a bad ECU"

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    Regular Member Cali-3k's Avatar
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    Re: CEL code 41 - injector fault

    a buddy had this 41 code show up on his 93, come to find out, the solution was changing the crank sensor.

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