92 mtx disabled CEL? PCM?

Discussion in 'Gen 1 & 2 - Electronics & Audio' started by Joe Ford, Feb 17, 2021.

  1. Joe Ford

    Joe Ford Member Supporting Member

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    CEL hasnt worked since i bought the car, i used to be able to get codes doing KOEO with light + jumper under hood. Swapped cluster and bulbs, still no good. Car seems to run perfectly fine. Smokes Mustang's. I would be far more comfortable with a CEL. Also, with new cluster, temp gauge points at 12 o clock as soon as i turn key to run position. I have a spare x2j, and i cant indetify the pcm thats currently in car. Any suggestions?
     
  2. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Throw the X2J in and see what happens. The temp gauge could be a faulty temp sensor.

    -Chad
     
  3. luigisho

    luigisho SHO Member

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    X2J will work in any non CA emissions manual car. You might have a faulty sensor, sender, or wire in the engine bay or relay. Wiring is getting old and showing it with all manner of issues these days.
     
  4. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Just reminded me, the ground for the cluster is on the driver inner fender well next to the air box. Several grounds for the different gauges.
     
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  5. Joe Ford

    Joe Ford Member Supporting Member

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    Seems like temp gauge problem worked itself out. But something is definitely wrong with this Speedo. It's a cluster I swapped in that I got used and it came off an ATX. Whole reason for the swap was no check engine light. But it's obvious that cluster isn't my problem so I'm going to swap my other one back in. This one has too many problems. I'll try to find a picture of the PCM to see if you guys can identify it.
     
  6. Joe Ford

    Joe Ford Member Supporting Member

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  7. Joe Ford

    Joe Ford Member Supporting Member

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    Thats the one currently in the car
     
  8. Joe Ford

    Joe Ford Member Supporting Member

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    Also, i got koeo to work. The connectors got pushed back and my jumper wasnt making contact.
     
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  9. luigisho

    luigisho SHO Member

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    I don't recognize that tag. The one I usually look at covers the port at the end of the unit and usually has a 3 or 4 character code and it is very prominent. I looked on ebay and seen the E9 serial on other used replacements. Not sure if those were original factory or replacement units. rubydist might know. He's probably pulled more than me.
     
  10. zoomlater

    zoomlater SHO Member Supporting Member

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    If the sticker is still there (located on the passenger side front door jam), it would show the code for the PCM that came with the car. That one looks aftermarket.
     
  11. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    If it's a 92 manual non California(EGR) car, it would have come with the X2J. What you have pictured appears to be a remanufactured PCM. Probably a Cardone. I ran both of the Ford engineering numbers on that unit into the Ford catalog at work with no crossover.

    -Chad
     
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  12. BaySHO Performance

    BaySHO Performance SHO Member

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    That's a reman X2J PCM made by Standard Motor Products. I have one. PN EM633. For 92-95 Federal (non-CA w/o EGR).
     
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  13. Joe Ford

    Joe Ford Member Supporting Member

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    Ok, thats good news. Any wiring diagrams on the 92 MTX that can maybe help me with my check engine light in-dash? I'm sure I can live without it but it will forever bug me. I've spent too many thousands of dollars in the past couple of months. I'm sure I can fix this problem with things I have laying around my garage. I just need a downloadable wiring diagram or a hard copy if someone's got one for sale
     
  14. zoomlater

    zoomlater SHO Member Supporting Member

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    did you try putting the X2J in yet
     
  15. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    Since the one in the car is a reman, its possible it has issues again / still. I think swapping the pcm is a good next step.

    When you connect the jumpers under the hood to a 12V light, you can get the CEL flashes there. Does yours work correctly under the hood or not at all?
     
  16. Joe Ford

    Joe Ford Member Supporting Member

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    It works correctly under the hood. Just not on the cluster. Im swapping in my original cluster and my used but new to me x2j. Will post update when completed.
     
  17. Joe Ford

    Joe Ford Member Supporting Member

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    It would surprise me none whatsoever if the Standard Motor Products reman has issues.. I have had many, many failures with these products. Often times right out of the box.
     
  18. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    If it works properly under the hood but not in the cluster, that suggests a wiring issue in the cluster or between the cluster and the pcm. Since it works under the hood, the odds of the pcm being the issue are very low.
     
  19. Joe Ford

    Joe Ford Member Supporting Member

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    That makes sense. is there a particular wire that someone could just cut to disable the check engine light? My guess is somebody couldn't get rid of the check engine light and seen as a nuisance. So they did the easiest thing they could do to get rid of the light. Total guess but only thing I could imagine.
     
  20. zoomlater

    zoomlater SHO Member Supporting Member

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    I don't have a 92 electrical trouble shooting manual, but this is from a 95. Not sure if they are the same though. The only thing I saw the could be the check engine light was the malfunction indicator.
     

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