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Old 02-27-2012, 12:12 PM
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Default 2000 Accord EX ECM Compatibility

I have a 2000 Accord EX 3.0 AT which was having the common shifting problems. I pulled from a donor 2002 Accord EX the transmission and engine which was not having shifting problems to resolve the issue. My 2000 is still having those problems after swaping out the drive train and I'm starting to think it's an ECU issue. My question is what is the compatibility between the two cars. The only difference I know besides years is the 2002 had traction control while the 2000 did not. I believe the 2000 models had ECUs 37820-P8C-A71 & 37820-P8C-A72 and the 2002 had ECUs 37820-P8C-A61 & 37820-P8C-A62.

Thanks in advance

2000 Accord EX 3.0 AT
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Old 02-27-2012, 12:55 PM
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I think you may find it difficult to locate anyone w/ specific advice. When I change ECM on my 94EX, I matched exactly and had no problems, but my problem was not a trans problem.

I checked goecm.com and found that part no's for 2000 and 2002 are different. That doesn't definitely mean they're different, but may indicate a difference.

I think for the cost of a used ECM (<$50 on car-part.com), I would try an exact match.

When I checked car-part.com for an ECM for your vehicle it returned only 1998-2000 donor vehicles, no 2002 were found, but I did not look at every page (40 pages of possibile donors). I've found car-part's X-change method works pretty good to show compatibility.

What are your symptoms? Is CEL on and obd2 codes set?

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Old 02-28-2012, 08:10 AM
Join Date: Feb 2012
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Yeah, that's been my exact problem...not a whole lot of anyone knows much about them. I'm a ton more familiar with Civics and this seems to be a unknown area of Accords. I believe I checked goecm.com too and didn't find a 2002 donor either? I've also considered having it reflashed by Honda, but they seem to be stubborn and don't want to reflash my ECM without them running their diagnostic checks ($100)?

What I may need to do is get the service manuals for both ( I have access to Mitchell) and compare pin-outs for the ECMs.

The symptoms are that when it is cold out (Missouri weather) so maybe 40s and below it hesitates to shift from 1st to 2nd or could maybe even be considered a flare bewteen gears. There are no CELs or codes for the transmission. Also, another issue that isn't much concern but now makes me think it's also the ECM is that when running errands and I turn the car on and off several times within a short period of time it wants to die eventually when I try to start it. As if it was flooding or not getting enough fuel. This was a problem originally with the first engine too.

2000 Accord EX 3.0 AT
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Old 02-28-2012, 07:33 PM
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Check this and your VIN....the size of the pdf is more than the site allows .
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Old 03-02-2012, 12:17 PM
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i believe my vin fits in that range. that's some really interesting information! i checked my pcm and it's the non updated version of the pcm. so it makes sense why it may have been doing the hard starts with the old pcm and old regulator. i checked the regulator on the engine i put in my car and it has a black mark it. so i assume it's the updated regulator. i've printed all the wiring diagrams and pin out diagrams and am checking them now for compatibility between 2000 and 2002. i'll update on my findings.

2000 Accord EX 3.0 AT
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Old 03-04-2012, 01:49 AM
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I have a 99 ex and have replaced ecm with 01 ex. Only thing was having to take to Honda to have new keys "programmed". I had to have vin# off the 01 for this. Have you pulled obd codes? If it's anything other than mechanical these will let you know if it could be maybe one of the shifting soleniods. I had code of p1607, I think, which is pcm/ecm internal failure a that caused me to replace ecm. I don't think it's your ecm because I think it only controls shift points.
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Old 03-05-2012, 08:27 AM
Join Date: Feb 2012
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I checked through the diagrams and the 2002 pcm is identical to the 2000 PCM except for the 2000 PCM used 2 bolts to mount while the 2002 PCM used three. There was an adapter plate in the 02 car that we were able to remove and install in the 2000 to resolve this problem. trs3 thanks for the information about reprograming the keys, that actually is something we figured out right after we installed the 02 PCM and found out it wouldn't start. So since we don't have a dealer close by we started swapping things. We changed the ignition/immobilizer receiver unit so we could use the 2002 key with the 2002 PCM and it was still a no start. So we're gonna exchange the PGM-FI ECU Main Relay that is behind the left side of the dash left of the steering column and see what that does.

2000 Accord EX 3.0 AT
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Old 03-07-2012, 09:11 AM
Join Date: Feb 2012
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Okay quick update! So after putting the 2002 PCM into the car it wouldn't start. We swapped out the immobilizer still no fire. So got the "brake code" from Honda so we could start it and get it to the dealership. Once there they said there was a short somewhere in the harness and so they looked over the diagrams and pointed out pin A13 on the PCM's were different between 2000 and 2002. After some time they moved a pin or a few and the car now runs and I believe better than it ever has! I plan on figuring out what pins they moved so I can post here for others to see and if this fixed the shifting problem and hot soak problem another answer to the many questions out there!!

2000 Accord EX 3.0 AT
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