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Old 11-15-2008, 12:55 PM   #1
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Cool time to show off the offboard

so after bricking my pcm and searching around the dhp forums i found that many people with bonnevilles had problems with failed writes while the pcm was in the car, with some DIY directions and a trip to morad, one of the benefits of living in cleveland , i got it all fabbed up and am proud to say i have had a 100% success rate of writing pcms

unfortunately i didn't think to take any pics while making it but heres the end result


here is the connector, it is the blue harness from the pcm and the OBDII connector, the 2 wire hanging out are for power

the battery charger i use to power everything, this way no losing the pcm mid-write due to low battery voltage

offboard and power

simply connect your pcm, don't forget to tighen the screw

then all i have to do is connect my dhp interface

turn on power, i used 12 low at first b/c i didnt wanna fry the pcm, but couldnt connect so i tried 12 high and no more problems, not in the pic but there is a switch for ignition power built into the harness

mid-write, battery voltage is showing ~14v

and success! all done in about a minute

if anyone is interested in parts for making one i can get them pretty cheap, or i could get the parts, fab up, test, and ship it to you
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Old 11-15-2008, 01:50 PM   #2
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Very well done. I've happy you were able to find a fix and correct the problem.
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