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Thread: Tricking ls computer into thinking its running

  1. #1
    Potential Tuner
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    Tricking ls computer into thinking its running

    Is there anyway to trick the 99 ls1 computer in to thinking it is running

  2. #2
    Is this a trick question? With the two 896 PCM's of that era that I own, as long as it is grounded at Pin 1 and Pin 40 and with 12 volt ignition power at Pin 19 and full time 12 volt power at Pin 20 and Pin 57 . . . it is "running". The same would apply to the two 0411 PCM's that I have. When powered in this manner, I can read them on my bench harness and write to them.

    If this is not the same for yours, it is either damaged or in some kind of odd flash recovery mode . . . "bricked". If bricked, there are still chances of recovery but it is somewhat of an emergency.

    Rick
    1970 Chevrolet El Camino LM7 5.3 liter mill and a 4L60E transmission.

  3. #3
    Senior Tuner mbray01's Avatar
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    Hes not asking how to power it up, hes asking how to make the ecm think the engine is running when its not attached to an engine. To do this essentially at a minimum you would need a 24x signal generator, then anything else you would want the ecm to see would need to be generated as well. There are systems that do this, however, the price im sure is probably prohibitive
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  4. #4
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    Rick which connectors are these pins on. I got red and blue

  5. #5
    These are on the blue connector.

    Rick
    1970 Chevrolet El Camino LM7 5.3 liter mill and a 4L60E transmission.

  6. #6
    Senior Tuner 10_SS's Avatar
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    you can do it with an Arduino... https://blogs.libreems.org/arduino-wheel-simulator/


    or a bit more expensive is $80 JimStim, generates crank and cam signals for a variety of different engines and you can create your own wheel patterns and load them. https://www.diyautotune.com/?s=JimStim

    I have used both, but own the JimStim so that is my dedicated simulator, plus it has a ton of other useful features.
    Last edited by 10_SS; 03-11-2020 at 09:15 AM.
    2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
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  7. #7
    Tuner in Training
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    I made an Arduino program with cam and crank outputs. I entered in the timing of the 24x crank signal and cam signals. This enabled me to troubleshoot a coil that quit working when it got hot. I also used it to pulse just one injector at a time so I could flow test my injectors.