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Old 09-26-2005, 09:58 AM
Join Date: Sep 2005
Posts: 8
Default ECU Replacement - '97 EX

I'm trying to help my dad with an ECU problem he's having w/ his 97 HONDA CIVIC/4 DR,sdn 5 SPD EX. The car probably has ~120k miles and is completely stock.

He brought the car into the dealership to have them check the CEL codes. They pulled 2 codes saying that 2 of the cyclinders were misfireing. They told him that the computer needed to be replaced with a new one. At a price of $860 just for the part, this seemed pretty extreme to me, so i was hoping to get more info from ppl who may have had a similar issue. The main issue is the car needs to pass an emissions test and will automaticcaly fail if the CEL light is on.

Does this sound like a problem that would require replacing the entire computer or could there be another cheaper way to fix the problem?

If the ECU does need to be replaced, are there any sources that i could find it for cheaper? They told him the part number for the EMC is 5345384.

Is this something that people would sell if they're upgrading their ECU's?

Someone replied to me on another forum saying that the i would need to find a "P2P" ECU to replace this one. Does anyone know where i could look to find one? I would want to be certain whatever i buy will work correctly in his car, but the only thing i have to go off of is the Honda Part number so far.

Thanks for the help!

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Old 09-26-2005, 01:38 PM
Senior Member
Join Date: Apr 2005
Posts: 624
Default RE: ECU Replacement - '97 EX

I have one for you from my 97 ex that would be completely plug and play, make me an offer. I upgraded to a chipped p28 ecu. I don't know if it will fix your fathers problem but I have the ecu if that's what you need. Wow 860 is ALOT of money!
97 civic ex coupe-D16z6 head-P&P-Skunk valve springs, retainers etc.-Skunk 2 Intake manifold w/Aem rail-Skunk2 Stage II cam-ARP Headstuds D16y8 block-Wisecvo pistons 8:6:1-Eagle H-Beam Rods-Blockgaurd-Stage IV XTD Racing Clutch-Emanage-T3/T4 .63 turbo
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Old 09-27-2005, 01:49 PM
Join Date: Sep 2005
Posts: 8
Default RE: ECU Replacement - '97 EX

Ok, i've been looking online for a P2P ECU and it seems like a used one can be gotten for pretty cheap. The only thing is that all the part numbers i see listed are not the same as the part number given to me by the dealership.

The dealer said i need a part number 5345384 and said it was an EMC (not ECU...is there a difference?), but when i search for P2P ecu on ebay i see in the details that the part numbers are something like this: #37820-P2P-A30, 37820-P2P-A31, 37820-P2P-A32 . Anyony know why there would be a difference in the part numbers?

Just wanna make sure i get the right part

Thanks again!
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Old 09-28-2005, 01:17 PM
Join Date: Sep 2005
Posts: 8
Default RE: ECU Replacement - '97 EX

OK, i was able to get some more info on this from the service report from the dealership.

The coded that were pulled from the dealership were:
P0304 and P0404 - Misfire detected on #3 and #4 Cylinders

Then the emissions check facility pulled these (in addition to the same 2 the dealer pulled):
P1300 - Manufacturer Controlled Ignition System

Then the dealer service report states that "the EMC (computer) is bad "

So this does refer to the EMC as a computer...but the part number they gave at the honda dealership doesn't reference a P2P anywhere... just the #5345384. Is there anyway to look this part up online to see exactly what it is?

Is it possible that the EMC and ECU are 2 different names for the same thing?
Also, could there be a difference between the model number and the Honda Part number for the EMC?

Thanks again for the help.
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Old 09-28-2005, 07:27 PM
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HCF Member
Join Date: Apr 2005
Location: somewhere in ct
Posts: 1,444
Default RE: ECU Replacement - '97 EX

ecu & ecm are the same thing ---
2005 - 2009 RIP
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Old 09-28-2005, 07:27 PM

01, 37820p2pa31, 97, chipped, civic, computer, ecm, ecu, emc, honda, lx, problem, replace, replacement, replacing

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