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Discussion Starter #1
Im doing a mini-me on my 98 DX. I picked up the P2p ecu to run it but now im reading that my car is obd2a and the ECU i have on the way may be
obd2b or vice versa. Can I rewire my car for the different ECU or is it pointless? How many wires would I end up changing?
 

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obd 2a`

yours is obd 2a same as mine , ill sell you my pba ecu (its off a 97 acura 1.6 el)

its the same as "si" ecu, i wont need it soon cause i ordered my conversion harness so ill need a p-28


joe griffin
 

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the p2p should be obd2a the p2j is obd2b right?

either way you'll have trouble using that ECU as your block doesn't have a place for the required knock sensor.

go OBD1, it is always the right answer
 

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bambooseven said:
the p2p should be obd2a the p2j is obd2b right?

either way you'll have trouble using that ECU as your block doesn't have a place for the required knock sensor.

go OBD1, it is always the right answer
That's not true.
I just finished a mini-me a few months ago and the place for the knock sensor is there... taped and everything.
All I had to do was screw it in and wire it to the ECU.

My car:
1997 Civic DX (D16Y7-same engine as all 96-98 CX, DX, and LX)
D16Y7 (1997) engine block
D16Y8 (1996) everything else

I've never heard of P2j, but that's not what tells you if it's an auto or manual.

As far as telling what ECU you have by looking at the code
For example:
37820-P2P-A31

37820 - is usually the same for all Hondas, no matter what year or model it is.
P2P – tells you what engine it goes with (in this case it’s D16Y8 )
A31 – tells you what trammission it goes with (this one is manual; any number above 50 is auto)

These are some of the ECU’s I’ve researched (I had a longer list, but can’t find it now):
ECU/EMC CODE LETTER OTHER #’s YEAR MAKER MODEL Trim OBD TRANNY

37820-P28-A02 AWL 760-840433 92-95 Honda Civic EX 1 5-speed
37820-P28-A01 ARM 760-620375 92-95 Honda Civic/CRX EX 1 5-speed
37820-P06-A02 AUI 740-327690 95 Honda Civic LX 1 5-speed
37820-P06-L00 AP? 742-501219 92-95 Honda Civic DX 1 5-speed
37820-P2T-A11 Z4 99-00 Honda Civic Si 2 5-speed
37820-P2P-A31 99-00 Honda Civic EX 2 5-speed
37820-P2E-A12 59 1200-246675 96-00 Honda Civic LX 2 5-speed
37820-P2E-L01 EF 901-115146 96 Honda Civic DX 2 (5-speed)
37820-P2E-L02 LG 901-200297 96-00 Honda Civic DX 2 (5-speed)
37820-P2P-A34 UP 921-322852 96-00 Honda Civic EX 2 5-speed
37820-P2E-A71 ER 260-175174 96-00 Honda Civic DX 2 (automatic)
37820-P72-A02 G1 970-102606 96 Acura Integra GSR 2 5-speed
37820-P2N-A61 1111-301713 96-00 Honda Civic HX 2 CVT
37820-P2N-A31 297-302848 96-00 Honda Civic HX 2 (5-speed)
37820-P75-A53 981-202919 98 Acura Integra LS 2 Automatic

red denotes engine
green denotes transmission

ECU/ENGINE
P06 – 1.5l SOHC ----- OBD1 - LX, DX
P28 – 1.6l SOHC Vtec OBD1 - EX, Si
P2E – 1.6l SOHC ----- OBD2 - CX, DX, LX
P2T – 1.6l DOHC Vtec OBD2 - Si
P2N – 1.6l SOHC Vtec OBD2 - HX
P2P – 1.6l SOHC Vtec OBD2 - EX
P72 – 1.8l DOHC Vtec OBD2 - GSR
P75 – 1.8l DOHC ----- OBD2 - LS

ECU/TRANSMISSION
A50 and up Automatic
A61 CVT
A under 50 manual
L under 50 manual

P.S.
Here’s some helpful links:
Intro to mini-me http://www.honda-tech.com/zerothread?id=554053
d16y7-d16y8 http://www.honda-tech.com/zerothread?id=735196
d16b7-d16z6 http://www.honda-tech.com/zerothread?id=859526
d16y7-d16y8 http://www.honda-tech.com/zerothread?id=1138058&page=1
ECU pinout http://www.turbod16.com/viewtopic.php?t=3572

EDIT...
Fixed it
 

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Discussion Starter #8
Got the ECU today....its a P2p-a12... according to the table you posted my car is:

37820-P2E-L02 LG 901-200297 96-98 Honda Civic DX 2 (5-speed)

Im confused :hammer:
 

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Discussion Starter #10
Back to my original question...as i know what ecu I have.

Im doing a mini-me on my 98 DX. I picked up the P2p ecu to run it but now im reading that my car is obd2a and the ECU i have on the way may be
obd2b or vice versa. Can I rewire my car for the different ECU or is it pointless? How many wires would I end up changing?
 

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Discussion Starter #12
Obviously I need to add like 3 wires for vtec but again thats not what im asking...According to D16rice the ECU should work fine. This is quoted from D16rice:
It’s the Vtec ECU (Engine Control Unit).
Your stock ECU is P2E, I believe. (found in all 96-00 CX/DX/LX)
To replace it, you'll need a P2P ECU (found in all 96-00 EX)
Howe ever, since it looks like you have a 1997 civic, you can only use 1996-1998 ECU's.

1996-1998 = OBD2a
1999-2000 = OBD2b

OBD2a and OBD2b are not interchangeable
 

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NS_Y7 said:
Im doing a mini-me on my 98 DX. I picked up the P2p ecu to run it but now im reading that my car is obd2a and the ECU i have on the way may be
obd2b or vice versa. Can I rewire my car for the different ECU or is it pointless? How many wires would I end up changing?
Ok, if you're still not sure if you have OBD-II a or b, here is an easy way to check it.
Pretend that you are looking at your ECU
The side that plugs into the wire harness is sectioned into 4 parts (A,B,C,D)

|-------|--------|--------|-----|
|....A....|.....B.....|.....C....|..D...|
|-------|--------|--------|-----|

OBD2a (manual transmission) ECU's use only A, C, and D.
B is empty. This is where transmission would plug in for Auto.

OBD2b (manual transmission) ECU's use only A, B, and C.
D is empty. This is where transmission would plug in for auto.

Your car is OBD2a because all 1996-1998 civics are OBD2a (from the factory).
If you have OBD2b ECU, you are better off selling it and getting the right one instead of using a conversion harness to go OBD2b.

P.S.
You should only do this AFTER you do the mini-me swap, not before.
 

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Discussion Starter #15
According to what your saying....the ecu is OBD-2b...because the D spot is not used...but on the side of the ECU it says...P2pA12?

Using the chart you posted it would fall under:
37820-P2P-A34 UP 921-322852 96-98 Honda Civic EX 2 5-speed

The 2 contradict each other :sadface:
 

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97civichb said:
ill sell you my pba ecu (its off a 97 acura 1.6 el)
No you wont!
ATTENTION !!!

to prevent scamming on this website - all users are required to have 65 posts, before they can sell ANYTHING on our website.
 

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NS_Y7 said:
...P2pA12?

Using the chart you posted it would fall under:
37820-P2P-A34 UP 921-322852 96-98 Honda Civic EX 2 5-speed

The 2 contradict each other :sadface:
A12 is the transmission code, it has nothing to do with it being a or b

EDIT...

Oh, I see where you're getting confused... the chart only goes up to 1998.
That's because I did it a long time ago; it shold actually go as follows
37820-P2P-A34 UP 921-322852 96-00 Honda Civic EX 2 5-speed
I'll edit the chart in a few minutes.
The way you decide if it's obd2 a or b is by where the plugs are located.
Sorry for the confusion.
 
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