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post #1 of 14 (permalink) Old 12-19-2011, 03:43 PM Thread Starter
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new ecm

changing out 2.7 ecm for 3.5 going to put ecm that came with engine. replacement one that came with engine is looking for pass key i was told if replacing with new ecm it would work .if using used one ecm would look for pass key no pass key no run ,new ecm would not find one looking would start and run any one else have this issue thanks

Last edited by DrDodge; 12-26-2011 at 07:30 PM. Reason: worse than my typing
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post #2 of 14 (permalink) Old 12-19-2011, 04:08 PM
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I would get the new engine up and running on the old ECM first.
If you've already done that and everything is working good then I would move on to the 3.5 ECM.

After installing the 3.5 ECM, start the engine.
If the engine only runs for two seconds, you will not be able to use that ECM without the Sentry Key.
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post #3 of 14 (permalink) Old 12-19-2011, 04:55 PM Thread Starter
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Yes runs on 27ecm was told by local dodge dealer new ecm wood work

Last edited by meterman001; 12-19-2011 at 05:00 PM.
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post #4 of 14 (permalink) Old 12-19-2011, 05:58 PM
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so the new ECM doesn't work? Or.... what? What's the question?
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post #5 of 14 (permalink) Old 12-19-2011, 08:26 PM Thread Starter
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Was from 300m with pass key
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post #6 of 14 (permalink) Old 12-19-2011, 08:32 PM
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You need all three of these from the same donor car: PCM, SKIM Module and Sentry Key.

If you are missing any of the three it will not work without an expensive trip to the dealer.

I'm guessing you didn't get the SKIM module and/or the Sentry Key from the donor car. So essentially that PCM you got with the "new" engine is pretty much worthless.
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post #7 of 14 (permalink) Old 12-19-2011, 08:43 PM
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i thought we went over this already. What Ron sayys is spot on. Your 300m ECM is a paperweight. Just use the 2.7 ECM.
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post #8 of 14 (permalink) Old 12-26-2011, 12:04 PM Thread Starter
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installed 3.5 ecm rebuilt 225.00 runs good trans shifting smother no ck engin lights everything working
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post #9 of 14 (permalink) Old 12-26-2011, 02:04 PM
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Quote:
Originally Posted by meterman001 View Post
installed 3.5 ecm rebuilt 225.00 runs good trans shifting smother no ck engin lights everything working
So, who programmed the ECM for you?
The dealership charged you $225 to do the work?
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post #10 of 14 (permalink) Old 12-26-2011, 07:24 PM Thread Starter
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they programed it all had to do was plug in had vin # from car engin came from all allso lifetime warrenty all computer resurces miamie fl.

Last edited by meterman001; 12-26-2011 at 07:29 PM.
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post #11 of 14 (permalink) Old 12-30-2011, 10:25 PM
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I did something similar with my 99.
I had to replace the PCM, got one out of the yard, the dealer made it work for $100
Brought them the PCM, from another M...and they made it work.



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post #12 of 14 (permalink) Old 12-30-2011, 10:38 PM Thread Starter
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Yesterday went to local dealer .had and light and ci encounters light come on .2.7 ecm sex no issues .dealer reprogramed ecm new one programed for tire size 190.00
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post #13 of 14 (permalink) Old 01-07-2012, 07:56 PM
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So did that come in a PC or a Mac?
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post #14 of 14 (permalink) Old 01-08-2012, 12:54 PM Thread Starter
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I believe they use windows pc to program these ecm , coud allso de dos.
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