Hello there, I'm new at the forum. After some days my mechanic told me that the problem of my 97 Accord was the ECU. I did A LOT of research about the ECU that I needed (since the tag is no longer visible on my ECU) and I found out that the code I was looking for was 37820-P0A-A51 (A51 A/T and A01 M/T right?). In some forums I visited said that, in some performance online stores mention that also, but in another forum was said that also POH ECU fit, so I got a little confused with this.

My car is a 97 Accord EX-R with a 2.2L F22B1 (SOHC vtec) with Auto Transmition.

Im almost sure the 37820-P0A-A51 will work but I need the confirmation here from some people that know more about this.

Hope you guys can help me out with this.

Thanks!

Marco

 

I just found out that the 37820-P0H-L51 is the one for the F22B1

http://board.accordtuner.com/showthr...4595-f22b1-ecu

and in this article on ebay

http://cgi.ebay.com/ebaymotors/ECU-E...Q5fAccessories

Please someone tell me the difference between the 37820-P0A-A51 and the 37820-P0H-L51.

Hope someone can help me out.

Thanks!

 

https://honda-tech.com/forums/honda-prelude-4/decoding-ecu-serial-code-2470135/

 

IIRC,
P0A = OBD1 (94-95 F22B1)
P0H = OBD2 (96-97 F22B1)

 

Thank you very much sir! How can I recognize if my ECU is a P0A (OBD1) or POH (OBD2) if the tag is no longer on it? Somewhere I read that If you open the ECU you can find the same number that is supposed to be on the tag... correct me if Im wrong please.

 

Easy way is knowing that the 90-95 Accords are OBD1 and 96+ are OBD2.

Another way to tell, in the case of a swap, would be that the OBD1 ECU has 2 rows of electrical contacts per connector (aka pins/wires) and the OBD2 ECU has 3 rows.

OBD1


OBD2

 

GhostAccord thanks a lot! You the man! This clarifies a lot.

I managed to get some pics from my ECU and got suprised, take a look.

P0A-A52???


OBD1!!!


Although my Accord is 97, as you can see the ECU is a P0A (OBDI) according to the image you just posted. Also I only managed to find information about the P0A-A51 not P0A-A52.

Since I can't find any info or ECU available for the P0A-A52, will the P0A-A51 work fine for my Accord?

Thanks!!!

PD: I just realized that in my first post mentioned 2.2L non vtec, that was wrong... is a 2.2L with vtec (F22B1)

 

Are you Canadian?

That could account for your car being OBDI still, unless it was modified.

 

Per: http://www.ccme.ca/assets/pdf/jia_trnsprt_obd_e.pdf

Page 14

 

I'm in Southamerica, this car was brought here from the States. Now that you mention that, although my car is registered as 97, when I saw the ECU the year of fabrication says 96 so that might explains it.

 

Seeing that you are in South America it makes sense that your Accord is OBD1. The OBD2 code was not mandatory in many countries until later.

Not sure where that quote came from Muffinman. I'm pretty sure that in 1996 OBD2 was also the standard here in Canada as well I own an OBD2 96 Honda Accord, manufacture date 9-11-95. Canada switched to the OBD2b in 98 just like the US.

 

Some random Canuck site haha - looked official

 

GhostAccord, so you think the P0A-A51 will work with my Accord even if it was working with the P0A-A52??? I still can't find any info about this last one...

 

Yes the 051 will work.

IIRC, the last number of the ECU part number pertains to the main board version. The 2 ECU's will still function the same.

 

Excelent then! Thanks for everything GhostAccord, I'll look up for a P0A-A51 ECU for my Accord.

 

Ok guys, I got now real problems... I ordered the P0A-A51 ECU for my Accord and when it was installed it just didn't work out fine.

The test with the scanner threw a 22-1 error that was a failure to from the vtec pressure.

Any help on this? Should I think on returning the ECU or there is a difference between the POA-A51 and the POA-A52 (this last one is the original in my car) that won't let it work fine?

 

What was wrong with the original ecu that you removed? Was it throwing the same code? If memory serves the vtec pressure switch is a code 21 so why would you replace the ecu instead of checking and/or replacing the vtec pressure switch?

 

Check/test your VTEC pressure switch.

 

The problem with the original ECU was that the emissions were way up high, but now with this new ECU the check engine lights up and is pure black smoke coming out of the exhaust. I'll check on that vtec swith though, but if anyone got another suggestion I'm all ears.

Thanks!

 

Here's a image from the error code



Its in spanish, sorry for the inconvenience.

Marco

 

It seems to me that there are too many variables left out of the equation to figure out what is truly going on. How many miles are on the engine? Is it driven hard? Is routine maintenance done regularly?

I'm no expert on cars but I can manage to fix my own vehicles which hopefully can help you out in the process. If your exhaust is blowing black smoke I believe that the air to fuel ratio is too rich meaning that its dumping too much fuel or not getting enough air (obviously). Maybe one of the fuel injectors are stuck and are leaking fuel. That's just one example of many possibilities that could be wrong.

Hopefully someone that knows more than me will chime in and help you out.

 

Hello everyone I tell them my experience I have a Honda Accord EXR VTEC SOHC 1997 A / T 2.2L fault with the ECU had not ascended over 3500 RPM then I risk it and change the ecu 37820-P0A-A52 by P0A-37820-A51
a success assure you pass emissions well, is strong, this Ok.

 

Hi,, can someone tell me where to buy a new ECU 37820 POA A52 for my Accord 96. My Accord ECU has an error so it does not recognize the number one cylinder in its position and therefore does not start.
Thanks