C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Nov 20, 2012 | 03:48 AM
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I have upgraded the computer in my '85 to the 165 version. I have finished some other work and am ready to fire the engine. I have an AutoXray 2000 scanner/code reader, do I now enter the info as an '86 or newer car so the scanner will read the newer ecm? I hope I will not need it right away but figured I better find out before I do.
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Old Nov 20, 2012 | 05:49 PM
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Originally Posted by Midnight 85
I have upgraded the computer in my '85 to the 165 version. I have finished some other work and am ready to fire the engine. I have an AutoXray 2000 scanner/code reader, do I now enter the info as an '86 or newer car so the scanner will read the newer ecm? I hope I will not need it right away but figured I better find out before I do.
You need to set the scantool for ALDL datastream of the ECM you are using so the sensor readings etc. are in the correct place. I am assuming you are using the correct Mask ID for the ECM also.
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Old Nov 20, 2012 | 07:13 PM
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Thanks, I was thinking I was on the right track.
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Old Nov 21, 2012 | 12:57 AM
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The 1227165 ECM was used from 1986 - 1989. You need to know what the EPROM code is, or at least what it was based on if it's modified.

I hope you got the correct version for your transmission type and rear axle ratio.

What did you do about the MAF power/burnoff module vs. the MAF power and burnoff relays that the 1227165 is expecting?
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Old Nov 21, 2012 | 06:05 AM
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I did a complete changover using the power & burnoff relays. Also I am installing a piggyback by PCM for less so if I understand correctly the prom numbers are a moot point. The ecm & prom are, naturally TPI items so I should just be able to program the scanner for the year the prom was made, right?
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