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P1500 General FR Terminal Circuit Malfunction

Posted by 2gGSXEclipse, Nov 30, 2008

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  1. 2gGSXEclipse

    2gGSXEclipse Proven Member

    356
    4
    Joined Apr 7, 2008
    847, Illinois
    The other day I was driving my car and it bogged out and shut down. I tried cranking it and it woud crank but did not fire. I got my trailer and towed it to my shop and scanned the code. It came up P1500 General Terminal Circuit Malfunction. I've been trying to figure out the problem. I have 13.7v comning out of the battery. Anybody ever fix this problem before.:dsm:
     

    504  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  2. luv2rallye

    luv2rallye DSM Wiseman

    7,507
    538
    Joined Jun 7, 2003
    Minneapolis, Minnesota
    You have an open circuit either inside the alternator (FR terminal, pin 4, green wire) or a bad connection (open circuit) from this terminal to pin 41 of the ECU (could even be the ECU, but least likely). Check this 4 pin connector first. Then measure voltage on pin 4 while turning headlights on - voltage should drop. The ECU uses this signal to control idle speed when heavy electrical loads are turned on.
     

    2K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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  3. D_Eclipse9916

    D_Eclipse9916 Proven Member

    1,002
    13
    Joined Mar 4, 2004
    Vienna, Virginia
    Everytime ive had that code its because the alternator was taking a sh**. Only had it happened once on my own car but thats exactly what it was on my friends cars too.
     
  4. 2gGSXEclipse

    2gGSXEclipse Proven Member

    356
    4
    Joined Apr 7, 2008
    847, Illinois
    Thanks guys,
    Replaced my alternator and looks like everything is all good.

    apreciate it
    Dean:dsm:
     

    504  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  5. HamazingHwhisky

    HamazingHwhisky Probationary Member

    8
    0
    Joined Jul 10, 2009
    Milwaukee, Wisconsin
    I just recently found the p1500 code as well, right about when it started running horribly. Not as noticeable when it's cold, but once it has warmed up, the RPM's will jump all over the place, idling anywhere from 0(dying on me, typically with large vacuum occurences like putting it into neutral from accelerating) to 1500, when it normally would idle around 800-1000 RPM. Also when I am accelerating, I feel the engine do the same thing, I can step on the gas and it'll go fine, then start sputtering and jerking quickly.

    I'm curious if the p1500 code is probably the issue, as I also just put a check valve between my intake manifold and my PCV valve so I don't have to keep replacing the stupid PCV valve... At first I thought this was maybe a vacuum / boost leak, but I reverted it back to not having the check valve in place and I still had this issue.

    I haven't taken a look at the alternator harness or anything yet because I haven't had the time, nor have a good idea of where to find it, so any help would be much appreciated...
     

    290  0

    1998 Mitsubishi Eclipse GST
    14.630 @ 104.000 · 2G DSM
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