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I need a PCM, and had a few questions

Old 03-01-2019, 05:27 PM
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Default I need a PCM, and had a few questions

I have a 2005 US spec AP2,

Essentially, when the factory alternator shit the bed, it took the PCM with it. How? I have no clue. After I replaced the alternator, it pushed 11.8 volts, and I traced all the grounds, rewired my harness with a new pigtail, and checked everything I could with the multimeter, even with the Master tech that I'm apprenticed to. after a couple weeks of getting nowhere, I took it to my Honda dealer for diag, and they diagnosed it as the PCM failing to send the signal to excite the alternator. I'm obviously lusting for the haltech or the AEM series 2, but I'm also looking for cheaper solutions. If I get a used 2005 PCM, with the immobilizer and ignition switch, will it work? Or is there a way to rig a dummy signal into the signal wire to force the alternator to stay excited without replacing the PCM?
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Old 03-01-2019, 07:07 PM
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You should be able to grab a junkyard pcm as long as it’s the same year and just programmed the existing keys to the pcm as well as update the vin number to match. Sadly had to replace quite a few Honda computers at work lately and any good scanner will have the program functionality you need
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Old 03-03-2019, 01:02 PM
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An auto key programmer can be had for ~$80 with it you can program like 500 keys. Charge $35/key and in 3 keys the tool has paid for itself. You'd also be undercutting dealers who charge 2-3x that amount.
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Old 03-04-2019, 09:53 AM
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Old 03-06-2019, 08:58 PM
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ill also add that if you live in a state that does obd emissions test you will def want to have it programmed by a shop with a real scanner, if the vin in the used computer doesnt get replaced with your vehicles vin it can prevent you from passing emissions.

I can verify this with 100% certainty in connecticut where i live and im sure there are other states that are the same
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