Question about 1983 Cadillac DeVille

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82 Cadillac ECM wiring diagrams/ troubleshooting

My 82 Cadillac DeVille quit while driving and was diagnosed as ECM failure. Purchased a new ecm and had installed. The new computer went up in smoke. The vehicle will start and run but acts as if in limp-in mode and barely pull itself. No check engine light and only ccode 52. would like ecm wiring diagrams or if anyone has experienced this and has an answer, please let me know.

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  • Larry Johns Jul 04, 2008

    I know what code 52 means I have ASE class 8 certification what i need is to find out why the second computer went up in smoke before I buy another one. The chips were changed to the new computer at the parts store by them. I would like to find diuagnostic pinouts and wiring diagram diagnostics I am Is it possible that the fuel chip was damaged the first time The vehicle would not restart after it quit the first time.. The second time I installed the computer myself, reconected the battery and started the vehicle when the computer started to smoke. I shut it off and collected the codes. It resarted and runs but will barely pull itself. I checked the harness and conecters for damage but could not find any obvious.

  • Larry Johns Jul 04, 2008

    the vehicle quit while going down the road. It would not restart. The computer was fried. I had it checked and was told it just a short in the computer. I bought a new one and they changed the chips at the parts store. I installed the new ecm; reconected the battery and started the vehicle when the new ecm started to smoke. I shut it off and collected the codes. It now starts and runs but will barely pull itself as if in backup mode. I would appreciate ecm diagnostic charts and pinputs and wiring diagrams before I fry another unit or if anyone has experienced this problem and knows where to check

  • Larry Johns Jul 05, 2008

    this would probably be a great site if it was a toyota hybryd

  • Larry Johns Jul 05, 2008

    www.autoshop.com would probably be a great site if i owned a toyota

  • Larry Johns Jul 05, 2008

    yes it does have the 4100 Could you bre a little more specific as to why that is my total problem

  • Larry Johns Jul 05, 2008

    I still need wiring diagram diagostics or specifec answers as to what to check. Something is obviously shorted to + that isn't supposed to be or it would not have fried the second ecm.

  • Larry Johns Jul 07, 2008

    Thank you Thank you Thank you I thought I was never going to get anything but another referral to another site with none of the info I needed
    LAJOHNS

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If a new ECM had blown shortly after replacement, the problem is likely to be in power wiring to ECM.
Check all battery wiring to the BCM/ECM for bad connections and shorts, (shorts, corrosion etc.), and test all voltages to ecm.
Check for short to ground in ckt491 (Orange wire), check for Open or Short to Ground in ckt 526 (Brown wire).

Posted on Jul 07, 2008

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Check your alternator ground. Clean existing ground and install an additional ground.

Posted on Jul 06, 2008

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Check this site for info on wiring for the Cadillac DeVille.

Posted on Jul 05, 2008

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  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 06, 2008
  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 06, 2008

    CODE 52

    What it simply means is that at some point in time the battery was disconnected from the vehicle and power was lost to the computer.

    OK do this procedure:

    1. turn the ignition key to the ON position. Do NOT start the engine.

    2. Simultaneously push the OFF and WARMER buttons on the A/C-Heater control head.

    3. as soon as you see any numbers push the LO button.

    4. When you see the word ECM push the HI button.

    5. When you see words ECM DATA push the LO button.

    6. When you see the words ECM INPUTS push the LO button.

    7. When you see the words ECM OUTPUTS push the LO button.

    8. When you see the words ECM OVERRIDES push the LO button.

    9. When you see the words ECM CLEAR CODES push and HOLD
    the HI button for 3 seconds and then release the HI
    button and turn OFF the ignition switch.


    This should CLEAR the code 52 from the computer and the CHECK ENGINE light(s) will NOT come back ON displaying the code 52.

    http://en.allexperts.com/q/Cadillac-Repa...

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Does it have the 4100 motor, if so there is all the answer you need.
thanks,
lee

Posted on Jul 05, 2008

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Www.autoshop101.com.try this link to solve your problem effectively

Posted on Jul 05, 2008

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CODE --52 -- Back-up fuel cal-pack missing

Cadiallac Brougham Codes

Posted on Jul 04, 2008

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    82 Cadillac ECM wiring diagrams/ troubleshooting


    If you need diagrams and don't mind paying for the alldatadiy.com is the place to go, They will have complete service manuals for your car.

    Jul 07, 2008 | 1983 Cadillac DeVille

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