Join Date: May 2005
Location: Milwaukee, WI
Feedback Score: 25 reviews
I believe that Jose is right, this was taken from an article here. read on.
So from what i gather.
No the 2000 p72 will not work as a striaght up swap out for your 98
The purpose of this article is to show you how to read the identification labels on ECU's and also how to distinguish between OBD1, OBD2a and OBD2b ECU's. Below is the identification sticker you will find on the side of the ECU.
There are three parts involved in reading the identification sticker. They are as follows:
A. This is the model number used for EVERY Honda ECU, no matter if you have an Integra, Civic, accord, etc. That number will always be 37820 and come first on the sticker.
B. This is the most important part. This identifies the model and year. Down below is a list of all Integra USDM ECU's.
C. This is the revision number. I believe all models have at least two different revision numbers. This is simply the version of that ECU that you have. In the picture above you will notice everything is the same besides the revision numbers. P75-A01 was in a 94 LS while P75-A04 was in a 98 LS. I contacted Honda and they stated the main differences between the different revisions were upgrades or enhancements to the motherboard or the chips due to stricter emissions regulations, etc. Note that some ECU codes are available over more than one generation (OBD0, OBDI and OBDII), therefore it is important to identify the ECU connectors as well as the ECU code.
Here are all the ECU's found in Integras:
P61 92-93 OBD1 GSR
P72 94-95 OBD1 GSR
P72 96-00 OBD2 GSR
P73 96-00 OBD2 ITR
P74/75 92-95 OBD1 LS/RS
P75 96-00 OBD2 LS/RS
PG6 88-89 OBD0 (all models)
PR4 90-91 OBD0 LS/GS
PR4 92-93 OBD1 LS/GS
How to tell apart OBD1, OBD2a, and OBD2b ECU's:
How to tell them apart by looking at the clips:
Look on the back of the ECU. OBD1 ECU's only have three receptacles while OBD2 ECU's have four. (one of these four is never used.) Now the OBD2 ECU pictured is version "a". The difference between version "a" and version "b" is the order of the plugs. If you look at the picture you notice the first one is used, the second one is skipped and the remaining two are used. on version "b" of OBD2 ECU's the first three are used and the last one is not. If you plan to do an ECU conversion this is important because things will not work if you have the wrong one. I believe all 99 and up Integras have version "b". As for OBD0 ECU's, its real easy to tell them apart because the clips are completely different then OBD1 and 2. on the back you have a green plug, a medal partition, then two black plugs.
Hope this helps everyone. Feel free to PM me if you have any questions.