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ECM locked after engine swap

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Old 02-05-2006, 06:37 PM
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Default ECM locked after engine swap
I just got done doing an engine swap in a 04 Silverado 5.3L and after having no battery power for a week, the ignition comes on and all tha accessories work, but the starter will not crank and the Theftlock lamp is on.. I also swapped out the ECM, but it was a Nelson tune.. Any ideas how to unlock it?
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Old 02-05-2006, 06:53 PM
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Originally Posted by TchargedLS1TA
I just got done doing an engine swap in a 04 Silverado 5.3L and after having no battery power for a week, the ignition comes on and all tha accessories work, but the starter will not crank and the Theftlock lamp is on.. I also swapped out the ECM, but it was a Nelson tune.. Any ideas how to unlock it?
so your original pcm works but the nelson one dosent?
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Old 02-05-2006, 07:04 PM
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Dunno, i got burned out today so I will check tomorrow. It just seems odd that he would get something like this wrong..
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Old 02-05-2006, 08:12 PM
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edit,

so it dosent even crank at all. then i'd guess something else other than pcm related.
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Old 02-06-2006, 12:55 PM
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Just put the old ECm back in and same thing.. I can even get a DTC reader to connect to the truck..
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Old 02-06-2006, 01:16 PM
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for the DTC reader, check to make sure you have power on the OBD2 port... see if your cig lighter works... if not the fuse is blown
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Old 02-06-2006, 04:17 PM
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Theres power or else the DTC reader wouldnt come on..
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Old 02-06-2006, 06:37 PM
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Anyone know where the purple wire on the starter solenoid comes from?
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