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Thread: P1633 Keep Alive Voltage Low

  1. #1

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    Default P1633 Keep Alive Voltage Low

    I've had the code for a little while. Jason (Krux) said something about 10 amp fuses being blown on a Taurus forum, but none of my fuses are blown.

    What does the code even mean? It appeared after I jumped it once... The battery has been reset, I've cleared the code many times, and it keeps coming back. Nothing seems obviously wrong.

    I do have a Powder pulley though. I don't think my alternator is the same as stock. It might be a higher amp than the stock. Not exactly sure though.

    Any ideas of what it could be?

  2. #2

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    I had this come up once on the dirt car. It was isolated to the ECU. We tried another ECU and it never came back.
    98 Black MTX (no options) retired at 339k miles. Kamikaze header,Fidanza flywheel,

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  3. #3

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    Default

    Oh really... That wouldn't be all that bad I guess.

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    The KAM "Keep Alive Memory" contains the adaptive factors used by the PCM to compensate for component tolerances & wear. It is not cleared with a code reader but only by disconnecting the battery for at least 5 minutes. The KAM should be cleared to improve drivability after any service that affects emissions. That would include almost everything on the engine. It takes at least 10 miles driving for the KAM to readapt to the new operating conditions.
    Gunman SR5- How do deal with this on your dirt car? Ten miles is a 40 lap main on a 1/4mile. The power output would be down while it adapts.

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    We just put another ECU in.

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    I'll try disconnecting the battery for a while, and see if that fixes it. I sure hope it does!

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    I don't think that will solve anything. I think that there isn't enough voltage to save the data so when you shut it off the data is lost. That would mean everytime it is started it must reacquire the fuel mapping data. Maybe it cannot even work at all which would leave it in the limp home/default mode with reduced engine power. Exchanging the PCM is probably the easy fix.

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    Gunman SR5 - What I really was asking was on the dirt car when or how does the PCM have enough time to restore the fuel mapping to optimize power output? Say you changed or disconnected the battery or the PCM during the week & then go to the track. You do a little wheel packing, qualify, & run a heat. The PCM would still not have completed mapping the fuel so you would start the main @ a reduced power level. I am a little curious how this works out. Have you noticed anything?

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    Oh that. yea the car gets a few trips up and down the pits and gets some track time to pack.

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    So with that code, I'm probably in limp home mode? It doesn't feel like it's gimped out, but who knows.

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    My best guess is yes. If it works and starts remapping you sometimes will feel or hear it as it adjusts the controlled devices. It will try to adjust everything it controls to match your driving style.

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    I have the same problem, My KAM voltage it too low. When my car sits over night or for like 8 hours or more, It doesn't run well till it gets warmed up or something. I'm thinking it may have to do with the KAM. Any ideas? Did I miss a wire or something when I changed my dash out? All of my fuses are good.
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    The Keep Alive Power comes from the battery. So check your battery voltage and connections. The room fuse supplys voltage to the ECU. Check the ground connection at the battery,the little black box.
    You also could check the connections on the ECU for any corrosion.

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    Didn't someone else have this issue recently that fixed it by fixing the PCM grounds?

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    Quote Originally Posted by iceracer View Post
    The Keep Alive Power comes from the battery. So check your battery voltage and connections. The room fuse supplys voltage to the ECU. Check the ground connection at the battery,the little black box.
    You also could check the connections on the ECU for any corrosion.
    Are you talking about the little black box that hangs off the negitive end? I know my battery is VERY corroded... Bla, New battery? And that little box was sticking up, I moved it down, maybe I snapped something.

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