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Old 03/12/2010, 09:14 AM   #1
ilovekswaps
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Default What ECU is this?

I've got an obd2 P75-AO2 ecu. From many websites I have looked at they tell me it's a obd2 1996 acura integra ls ecu.

But then this wibsite and a couple more,
http://www.hondaecu.net/products/ACU...1996_78812.htm
says it's an obd2 1996 acura intgera gsr ecu. I though all p75 ecu's were used for a b18b? and b18c1 was p72? Can anyone tell me what ecu this car was orginally used for?

I also have another question, I have an obd1 pr4 runing a b18b1, every single list of ecu's I have looked at says pr4 are 90-91 Integra LS/GS, which to my knowledge is obd0, and used to run a b18a1. How is it I have an obd1? And how is it that it's runing a b18b? I've looked at 10 or more Honda ecu code lists (including this one http://www.jdmcity.com/showthread.php?t=37) and I still can't find an obd1 pr4 ecu. The code is PR4-A11
Can anyone tell me what ecu this car is orginally used for also? And how it is runing a b18b1 in my car? I know it's obd1 by the plugs on it.

Thanks

Last edited by ilovekswaps; 03/12/2010 at 09:21 AM.
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Old 03/12/2010, 06:10 PM   #2
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Default Re: What ECU is this?

p75 is definitely ls/gs and not a gsr ecu. The pr4 ecu is only obd0 and obd2 so maybe its obd2 because you have a b18b. The pin locations on the ecu itself can tell you exactly if its obd2 or 1 or 0. Hope that helped you.

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Old 03/13/2010, 06:35 PM   #3
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Default Re: What ECU is this?

Quote:
Originally Posted by jh4dc View Post
p75 is definitely ls/gs and not a gsr ecu. The pr4 ecu is only obd0 and obd2 so maybe its obd2 because you have a b18b. The pin locations on the ecu itself can tell you exactly if its obd2 or 1 or 0. Hope that helped you.
Yeah that's what I was thinking. Most of the info I've found said p75's are ls/gs, except for that one link and a few other sites. One guy on H-T also asked if it was a GSR ecu.

I'm %99 sure the pr4 is obd1, I remember looking at the pin locations and it looking like an obd1, but I could be wrong. Maybe it's out of a 92-93 DA? but then it wouldn't work very well for a b18b would it? I'll take a pic of it when I have the chance so you can see it.

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Old 03/14/2010, 07:26 PM   #4
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Default Re: What ECU is this?

No one knows anything about b-series ecu's?

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Old 03/14/2010, 11:04 PM   #5
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Default Re: What ECU is this?

P72 is the b18c1 gsr ecu obd1 and 2
p75 is the obd1 and 2 94-5-6-7-8-9-00 integra ls/gs ecu
pr4 Obd1 years 1992-93 run the obd 1 years as in 92-95 is all obd1 then 96and up is OBD2
pr4 Obd0 years would be 1990-91

what you have is a OBD1 ecu within the DA years 92-93

if this is confusing ya search a bit deeper


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Old 03/15/2010, 01:09 PM   #6
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Default Re: What ECU is this?

Quote:
Originally Posted by turborex View Post
P72 is the b18c1 gsr ecu obd1 and 2
p75 is the obd1 and 2 94-5-6-7-8-9-00 integra ls/gs ecu
pr4 Obd1 years 1992-93 run the obd 1 years as in 92-95 is all obd1 then 96and up is OBD2
pr4 Obd0 years would be 1990-91

what you have is a OBD1 ecu within the DA years 92-93

if this is confusing ya search a bit deeper
92-93 DA's come with a b18a correct? If it was runing a b18b wouldn't it not be at its full potential or runing the way it should?

Last edited by ilovekswaps; 03/15/2010 at 01:16 PM.
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Old 03/15/2010, 10:21 PM   #7
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Default Re: What ECU is this?

Well IDk, it really doesnt matter still a LS i dont think there is a BIG difference its still obd1 ecu and the engine (b18b1) is too obd1 or 2 as long as you got all your sensors hooked up


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Old 03/15/2010, 10:36 PM   #8
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Default Re: What ECU is this?

how do you know its OBD2?

I have a OBD2 P75 ECU if you want me to look at it to compare.


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Old 03/16/2010, 10:34 AM   #9
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Default Re: What ECU is this?

Quote:
Originally Posted by turborex View Post
Well IDk, it really doesnt matter still a LS i dont think there is a BIG difference its still obd1 ecu and the engine (b18b1) is too obd1 or 2 as long as you got all your sensors hooked up
Could I use an obd1 p75 in my car? just plug and play. Without causing any damage?

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Old 03/16/2010, 10:38 AM   #10
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
how do you know its OBD2?

I have a OBD2 P75 ECU if you want me to look at it to compare.
I know the p75 ecu is obd2 because of the pin locations, same for the pr4 being obd1
http://www.hondata.com/techecuid.html

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Old 03/16/2010, 06:26 PM   #11
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Default Re: What ECU is this?

Quote:
Originally Posted by ilovekswaps View Post
I know the p75 ecu is obd2 because of the pin locations, same for the pr4 being obd1
http://www.hondata.com/techecuid.html
ok but FYI i had an OBD1 P75 (94-95 RS/LS/SE) and an OBD2A(96-99 RS/LS/GS) P75, the OBD1 PR4 would be from the 92-93 integra.


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Old 03/16/2010, 07:28 PM   #12
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
ok but FYI i had an OBD1 P75 (94-95 RS/LS/SE) and an OBD2A(96-99 RS/LS/GS) P75, the OBD1 PR4 would be from the 92-93 integra.
What's your point? You asked how I knew the p75 was obd2, and I explained how I knew.

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Old 03/16/2010, 10:39 PM   #13
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Default Re: What ECU is this?

88-91-obd0
92-95-obd1
96-2001-obd2a-b


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Old 03/17/2010, 09:49 AM   #14
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Default Re: What ECU is this?

.
Quote:
Originally Posted by turborex View Post
Well IDk, it really doesnt matter still a LS i dont think there is a BIG difference its still obd1 ecu and the engine (b18b1) is too obd1 or 2 as long as you got all your sensors hooked up
Quote:
Originally Posted by ilovekswaps View Post
Could I use an obd1 p75 in my car? just plug and play. Without causing any damage or issues?

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Old 03/17/2010, 10:31 AM   #15
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Default Re: What ECU is this?

Quote:
Originally Posted by turborex View Post
what you have is a OBD1 ecu within the DA years 92-93
this is my point


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Old 03/17/2010, 02:29 PM   #16
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
this is my point
I knew that by looking at the pin locations. I was pretty sure it was obd1 from the begining, I was just asking is it ok for it to run a b18b without any issues. And I was asking what an obd1 pr4 came out of because all I could find is obd0 and obd2 pr4's.

This is what I said up there^^
Quote:
Originally Posted by ilovekswaps View Post
I'm %99 sure the pr4 is obd1, I remember looking at the pin locations and it looking like an obd1. Maybe it's out of a 92-93 DA?
Now my current question is, is it ok for me to use an obd1 p75 in my car. Plug and play without any problems.

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Old 03/17/2010, 10:48 PM   #17
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Default Re: What ECU is this?

Quote:
Originally Posted by ilovekswaps View Post
I knew that by looking at the pin locations. I was pretty sure it was obd1 from the begining, I was just asking is it ok for it to run a b18b without any issues. And I was asking what an obd1 pr4 came out of because all I could find is obd0 and obd2 pr4's.

This is what I said up there^^


Now my current question is, is it ok for me to use an obd1 p75 in my car. Plug and play without any problems.
what year motor do you have? if its a b18a from 92-93 or a b18b from a 94-95 you will be fine. if its a later motor you will need to either do some creative wiring or get at least an OBD1 dizzy and alternator.


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Old 03/18/2010, 11:29 AM   #18
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
what year motor do you have? if its a b18a from 92-93 or a b18b from a 94-95 you will be fine. if its a later motor you will need to either do some creative wiring or get at least an OBD1 dizzy and alternator.
How do I check and find out what year my engine is? Everything is already in the car runing, so it all works. I bought a fifth gen civic and it came with a ls swap. The stamp on my tranny says it's out of a 99. But there's no way the dizzy, I/M, wiring harness, engine etc... is also out of a 99 (obd2) because its all runing off an obd1 ecu which like you said is 92-95. Or is it possible for anything besides the tranny to be out of a 99?

Is there any solid way to check the year of my block, I/M, dizzy etc..? And be %100 percent I know what everything is?

Last edited by ilovekswaps; 03/18/2010 at 11:32 AM.
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Old 03/19/2010, 11:43 AM   #19
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Default Re: What ECU is this?

Anyone know of any good way to check the year of everything under my hood? I want to check it seprately. There probably isn't but I want to know if I could find out. Thanks

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Old 03/19/2010, 12:05 PM   #20
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Default Re: What ECU is this?

Quote:
Originally Posted by ilovekswaps View Post
Anyone know of any good way to check the year of everything under my hood? I want to check it seprately. There probably isn't but I want to know if I could find out. Thanks
check the stamp on the head, if everything is running obd1 now why are you trying to put a p75 on it, what ecu are you using now?


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Old 03/19/2010, 05:08 PM   #21
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
check the stamp on the head, if everything is running obd1 now why are you trying to put a p75 on it, what ecu are you using now?
What should the stamp on the head be?

I figured the obd1 p75 would run my ls better. That's why I was asking if the pr4 would let the b18b run at it's full potential, since the pr4 is originally from a b18a

Last edited by ilovekswaps; 03/19/2010 at 05:13 PM.
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Old 03/19/2010, 05:29 PM   #22
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Default Re: What ECU is this?

Quote:
Originally Posted by ilovekswaps View Post
What should the stamp on the head be?

I figured the obd1 p75 would run my ls better. That's why I was asking if the pr4 would let the b18b run at it's full potential, since the pr4 is originally from a b18a
its in one of the circles on the head stamp. there are 4 little circles on the front and in one will be 2 numbers indicating the year of it.

not that it really matters, if its running obd1 now the wiring is figured out. the b18a was rated at 140hp and the b18b at 142hp. there were minute changes in the motor. if its not running correctly look to other causes besides the ECU first.

Last edited by nate2k5; 03/19/2010 at 11:55 PM.

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Old 03/19/2010, 10:50 PM   #23
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
its in one of the circles on the head stamp. there are 4 little circles on the front and in one will be 2 numbers indicating the year of it.

not that it really matters, if its running obd1 now the wiring is figured out. the b18a was rated at 140hp and the B18B at 142hp. there were minute changes in the motor. if its not running correctly look to other causes besides the ECU first.

fixed


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Old 03/19/2010, 11:40 PM   #24
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Default Re: What ECU is this?

Quote:
Originally Posted by nate2k5 View Post
its in one of the circles on the head stamp. there are 4 little circles on the front and in one will be 2 numbers indicating the year of it.

not that it really matters, if its running obd1 now the wiring is figured out. the b18a was rated at 140hp and the b16b at 142hp. there were minute changes in the motor. if its not running correctly look to other causes besides the ECU first.
Lol oh shit, thanks for pointing that out. I feel like a dumbass. I was thinking the 92-93 DA's made the same amount of hp as the 90-91. But your right it's only 2 hp difference and 1 tq difference. Thanks for all the help

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Old 03/19/2010, 11:55 PM   #25
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Default Re: What ECU is this?

Quote:
Originally Posted by jdmb18hatch View Post
fixed
thanks, edited


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