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PCM Reset HELP!

This is a discussion on PCM Reset HELP! within the Computer & Tuning forums, part of the LSx Technical Help Section category; Hi all. I just bought a 1999 Firehawk M6 White. I cleaned the MAF and TB. I wanted to reset ...

  1. #1
    Member flipsutter's Avatar
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    PCM Reset HELP!

    Hi all.

    I just bought a 1999 Firehawk M6 White.

    I cleaned the MAF and TB. I wanted to reset the PCM and I followed what was listed on all the websites I found.

    I do not have an SES Code. I wanted to do it to reset the system.

    My question to you is. Shouldn't the car go through the idle up phase and backdown learning what is needed to learn? I might also be doing it wrong. Here are my steps.

    Turn the iginition to "on." This is the part of the igintion that is right before you turn the car over. From what I understand this is the "on" position. Am I right?

    Then I raise the hood and remove the PCM IGN fuse first then the PCM BAT fuse second.

    I have waited 20 minutes and then turned the key off and then put the fuses back in.

    Am I wrong that it should start to quote "relearn" all the idling? Or should it just start up and go right to its normal idle?

    I have also tried it 4 different ways in pulling the bat first then ign then ign then bat on both sides. I have no idea what to do next.

  2. #2
    lmpounded SandmanWs7's Avatar
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    Its not going to idle high for a long time. it takes seconds for it to relearn.

  3. #3
    Member flipsutter's Avatar
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    Thats what I thought too. It takes about 2 seconds. It starts like it always does then drops down to 800 rpm then stays there. I Have a friend how has a 2000 ta and his does weird stuff when it is relearning. And it takes at least 20 seconds to learn. Mine does nothing like that.

  4. #4
    lmpounded SandmanWs7's Avatar
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    here we go
    Quote Originally Posted by Mr. Luos View Post
    The way to reset the pcm is to first turn the key on (not cranked) then remove the "pcm ign" and "pcm bat" fuses from the fuse boxes located in the engine bay on the drivers side (in front of fender), then turn key off, replace fuses then start her up. Your PCM is now reset. If you had any code showing (SES) before... it should now be gone now.. if it comes back on then you need to have the code scanned so you can pinpoint the problem and correct it. Once corrected you can reset the PCM again to see if you solved the issue. The computer will relearn everything including anything previously programmed such as with LS1edit.

  5. #5
    Member flipsutter's Avatar
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    Thanks sand. I will try it again tomorrow. Maybe it is being reset and it relearns pretty fast. Thanks for your help.

  6. #6
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    I think it's being reset - you can always induce a SES code for something by pulling a fuse. Maybe AIR PUMP or ENG SEN.

  7. #7
    Member bertt23's Avatar
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    i thought u could reset by just disconecting the battery. i changed the tps and map, and disconnected the battery, after five mins i hooked it back up and went the next day to autozone and had the same codes, should i follow these steps or did i do it right

  8. #8
    JMAC Racing WS6ICK's Avatar
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    2000 Trans Am WS6 LS6
    2006 GTO LS2

    Turn key on, don't start car
    Pull PCM BATT and PCM IGN fuses in eng compartment
    Wait 5-10 min
    Turn ignition off
    Replace fuses

    Idle will be a little grumpy until it relearns - also resets the readiness tests.
    2010 Camaro
    2006 GTO, LS2, 1 of 475
    2009 Chevy Silverado


  9. #9
    TunedbyFrost.com Tuner Frost's Avatar
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    It only takes a few seconds actually... Alternately, as noted by another poster above, you can also unhook your battery.

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