vx p07 ecu
 

there were 3 models of the vx produced, fed., canadian, calif., the calif. model did not have egr, and only a 4 wire o2 sensor, so how do you tell the difference between the two ecu's?

This should answer your question. Honda ECU Label Decoder

The mentioned link does not seem to work any more. Any ideas? I'm trying to understand the different VX ECU labels.

Thanks!

Yeah, sorry, I forgot to edit my post lately since the original poster of the link doesn't want to share his info anymore.

Basically there is a California version (no lean burn and 4 wire o2), and two versions of software for the other 49 states models (revision A00 and revision A01) basically just an updated revision of the software. Revision A00 was 92-93 model year and the newer revision was for 94-95. I've ran both revisions in my 94 VX with now difference in mileage.

Thanks a bunch for the info. I'll see what I can do to chase one down at a good price.

I've got one for sale. I'm looking to get $80 shipped for it. I guarantee it works as I used it in my VX for a few days to test it. These ECUs are going for $100+ shipping on Ebay. Just let me know via PM.

Here's something I've read, but not confirmed for myself: The first letter of the last 3 digits is generally the region code for the ECU. The Honda region code for fed. emissions is KA, High altitude versions are KH, cali emissions are KL. It's the last letter of that region code that should match.
If that info holds true (a quick browse of car-part.com seems to confirm), california versions should be numbered 37820-P07-L##.

So if I understand correctly, 37820-P07-A00 would be a 49-state ECU produced between 92 and 93. It doesn't have the updated code. Is that correct? Perhaps the most ideal situation would be a 37820-P07-A01.

You are correct about the nominclature of the ECU label. As far as which revision (A00 or A01) is better, I cannot confirm which is "better". I have no way of telling what changes were done in the code. As far as I could tell, there was no noticable difference between the two while they were in my VX as well.

CA most definately have EGRs. How do I know? I took out my EGR valve and cleaned up my EGR ports. :)
Gary

But would the A01 work in a 92-93 VX?
Gary

Most likely. I doubt Honda messed with the ECU connector pinouts or sensor specs or anything, so it should be plug'n'play.

Both the A01 and A00 revisions work in all years of VX Civics. I've personally ran both revisions in my 94. The pinouts are the same as far as connectors. It's just that Honda had made a revision to the 94-95 VX ECU for some unknown reason to me that required the A01 to be added. For all I know, it could be them just changing the Check byte in the coding.

I got my P07-A001 ECU delivered from the Ebay auction I won.
It cost me a total of $60. I was going to wait for the other one that
expired later and had a bid price of $.99. That one ended up going for
$10.50 + 20 shipping. Argh! Oh well, you can't win 'em all.

The ECU had a bit of surface rust so I decided to opened up the metal
box and all is good. The PCB looked shiny with no smoke damage.

Whoever said the Fed ECU has two board is wrong. Just one big PCB, although there was about three sub-boards about 1in x 3in in dimension
(I think that's that they were talking about). I have pics if anyone is
interested in seeing the PCB.

Now I'm going to buy the $79 O2 sensor and I'll be set to do the conversion
(I think).
Gary

Gary, you have a lot of cars! BTW, how did the conversion go?

I'm going to give it a try this weekend. I have the diagram, the O2, and ECU. I'm going to the junk yard to pick up an extra 4-wire connector so I don't have to cut the car's harness.

I'll keep you guys posted.

I always understood that there were actually THREE USDM ECUs: the Federal ECU, the early CA ECU with five wire sensor (but no lean burn) and the later CA ECU with four wire sensor.

I have a '93 CA VX and it has the 4-wire O2 sensor and EGR.

I got a 37820-P07-A00 ecu if any 1 needs hit me up on aim eatcouter