i got a p72 ecu. wen i bought it, i was under the full impression that it was an obd1 ecu. last nite, sumthin happened to make me think otherwise. can nebody tell me if there some site that i mite be able to put in the ecu code and find out wat obd my ecu is?

 

What could have possibly happened to give you the impression that your p72 ecu is anything but OBD1? If it were OBD 2A or 2B, it wouldn't plug into the ecu plugs fitted with your car. The connectors for OBD 1 and OBD 2 ecus are different, so there's no way of mixing up ecu types.

Oh, and factory p72 ecu ROM's are all the same, aside from the polarity of the IAB circuit. So regardless if you had a OBD 1 or 2 version of the ecu, it would react the same on your car.

 

yea, im still buildin tho. i have no way of kowing for sure wat obd code it is. i can't even test to see if the plugs fit right??
1 more thing, so the only thing that differences the obd 1 from obd2 are the plug connectors???right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostn B20 &raquo;</TD></TR><TR><TD CLASS="quote"> so the only thing that differences the obd 1 from obd2 are the plug connectors???right?</TD></TR></TABLE>

Differences in OBD 1 and OBD 2 P72 Ecu:

-IAB polarity is different
-Connectors and pinouts are different

 

Easiest way to check is to crack it open and see if it has provisions for a chip. If not, it is definitely OBD2 and unchippable.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dartanian &raquo;</TD></TR><TR><TD CLASS="quote">Easiest way to check is to crack it open and see if it has provisions for a chip. If not, it is definitely OBD2 and unchippable.</TD></TR></TABLE>

Good one...didn't even think of that.

But wouldn't the ecu plug configuration help determine the OBD version of the ecu as well? Just as one would have to know what the internals of an OBD1 ecu look like, knowing the general layout/configuration of the ecu plugs would be just as easy?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EnjoyTheRideDC2 &raquo;</TD></TR><TR><TD CLASS="quote">

Good one...didn't even think of that.

But wouldn't the ecu plug configuration help determine the OBD version of the ecu as well? Just as one would have to know what the internals of an OBD1 ecu look like, knowing the general layout/configuration of the ecu plugs would be just as easy?</TD></TR></TABLE>

Yes, it would. I don't know if it would be as easy since they both use three plugs, so you would have to be able to distinguish the difference between the connectors. I just find it easiest to open it up. It either has provisions for a chip or it doesn't.

A phillips head screwdriver is easier to find than plug configurations hidden somewhere in cyberspace but either method works.

 

USDM OBD1 ECU's are rectangular in shape with 3 connection ports. The OBD2 ECU's I have seen are a wee bit smaller and square. Like the JDM ECU's. They have 4 connection ports. Although there are some JDM OBD1 ECUs that have 4 ports as well. They are found in JDM AUTO 92-95 Civic, Integra, and Preludes.


Modified by GhostAccord at 9:33 AM 7/29/2008

 

yea, mines has 3 plug in ports. so it's def obd1...right?

 

n, also. i had it next to the hondata kpro ecu, and mines looks like it 2 the size of the kpro, didn't kno if this helps...

 

The smaller square ECUs are OBD2b. There is no size difference between an OBD1 and OBD2a P72.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostn B20 &raquo;</TD></TR><TR><TD CLASS="quote">yea, mines has 3 plug in ports. so it's def obd1...right?</TD></TR></TABLE>

No. Open it up like I said and check to see if it has a space for a chip.

 

Yes you have an OBDI P72 ECU.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Team Integra.net - Thread title = ECU Identification &raquo;</TD></TR><TR><TD CLASS="quote">
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.</TD></TR></TABLE>

Here is the link give it a read. Or you could still take your top cover off and look for the chip space. Are you familiar with what the chip space looks like?

 

that link was probably the best help, i got. but thank all of you for the help tho...yea, it's obd1, i'll kno for sure when i get my stuff 2gether. thank you.