no A/C pm5 vs. A/C pm5 ECU

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Old Feb 21, 2013 | 06:44 AM
  #1  
crxguy406's Avatar
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Default no A/C pm5 vs. A/C pm5 ECU

My project had no A/C stock, and my parts car (both 90 CRX DX) had A/C. I noticed that the PM5 ECUs of the two have different numbers. (As well as a special note markered on the one saying "NO A/C OUT")

I want to use the PM5 from the parts car, because I think the other one was chipped wrong, bad or otherwise messed up.

Will there be any issues in using an A/C PM5 on the crx which never had AC?
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Old Feb 21, 2013 | 08:06 AM
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Default Re: no A/C pm5 vs. A/C pm5 ECU

no problem at all
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Old Feb 21, 2013 | 08:36 AM
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Default Re: no A/C pm5 vs. A/C pm5 ECU

thanks!
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Old Feb 21, 2013 | 02:14 PM
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Default Re: no A/C pm5 vs. A/C pm5 ECU

Wow, I never knew there was a different ecu for no a/c.
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Old Feb 21, 2013 | 03:04 PM
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Default Re: no A/C pm5 vs. A/C pm5 ECU

Originally Posted by rallypoint_1
Wow, I never knew there was a different ecu for no a/c.
I never heard of it either.
But even if it exists, it would not operate any differently.... other than the inability to compensate if an AC system was ever installed.
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Old Feb 21, 2013 | 04:43 PM
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Default Re: no A/C pm5 vs. A/C pm5 ECU

OP, can you show us a pic of both ECU's to compare the "ac" with "no ac"? I had a pm9 ecu and replaced it with a pm5 and just recently added ac. Did I just get lucky with my ECU?
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