1994 Seville SLS PCM Relearn
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Cadillac Powertrain Control Module (PCM) Tuning Discussion, 1994 Seville SLS PCM Relearn in Cadillac Engine Technical Discussion; Hello, I am working on my parents 1994 Seville SLS with circa 140k on it. A local garage diagnosed it ...
  1. #1
    Anthoy is offline Cadillac Owners Member
    Automobile(s): 1994 Seville SLS
    Join Date
    Jan 2010
    Posts
    1

    1994 Seville SLS PCM Relearn

    Hello,
    I am working on my parents 1994 Seville SLS with circa 140k on it. A local garage diagnosed it with a bad PCM and I have been elected to replace it. I have a few questions:
    1) Where is the PCM located on this vehicle?
    2) What is the PCM relearn procedure?
    3) Where is the PCM diagnostic connector located?
    Thanks,
    Anthony

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  3. #2
    GarysBlues is offline Cadillac Owners Member
    Automobile(s): 1994 4.9 Sedan DeVille
    Join Date
    Jul 2010
    Posts
    2

    Re: 1994 Seville SLS PCM Relearn

    Run a diagnostic test on it. Start your car. Push the OFF button on your temp control center and the RED Rectangular temp increase button "at the same time" This will put your speedometer area into the Diagnostic Control Center mode. Your computer will then do a scan. After each scanned item if theres no problem it will say OK. Or it will give a CODE. WRite that code dowm if it comes up. It could also say HISTORY wgich is OK also,

    The PCM is the last item that will come up on the Scan and will often have a Question Mark after it? Thats common also. OR a code will come up. Take particular notice to whats being said here, since this is the area your concerned with.

    Whats the car doing?

    Gary

  4. #3
    flitty is offline Cadillac Owners Member
    Automobile(s): 94 deville
    Join Date
    Oct 2010
    Age
    30
    Posts
    4

    Re: 1994 Seville SLS PCM Relearn

    mine is getting the ? mark after pcm. what does that mean and would i have to reprogram it also?

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