n_senn

Okay, I have seen alot of people claiming knowledge of a subject when they are really more ignorant than the question-poster of the answer.

Please, if you do not KNOW then do not post.

I am putting a 3 stage vtec engine in my 99 civic LX. I have the p2j-j11 ecu.

This is the OBD2b ECU.

The engine had a cut OBD2a harness so i cant use it as a template.

Can the OBD2b ecu control the obd2a engine properly?

I need to know with certainty what the pinout is for that ecu.

Yes i know it is "plug and play" with a Y8 wiring harness and Y8 ECU but I am not using a Y8 ECU.

Is it 100% definite that this ECU pinout follows the same pattern as other OBD2B honda ecus which would make its pinout identical to say a Y7 or Y8 obd2b ECU?

Has someone actually DONE this and knows the pinouts for this ECU?

I have been looking for quite some time and all the posts I see are rumors and someone that heard from a friend who heard from a friend, or they turn into a gripe fest and the question never gets answered.

Any help is greatly appreciated.

n_senn

*post edited*

CivicSpoon

I've been searching on and off for about 2 years now for an ECU pinout for any of the 3-stage VTEC ECUs, and I haven't found a single one. The only thing I've seen that was even close, was an ECU pin location for the 2nd VTEC solenoid (red wire) for an OBD2A ECU. http://hondaswap.com/ecus-electronic...-wiring-58066/

The only thing I could think of to do based on that, is to compare the pins sticking out of your ECU, and any empty pin on your harness. Of course also taking into account of the EGR wiring you're going to add.

But I realize that's not quite the type of response you're looking for, so hopefully someone will come forward with real answers. I've love to see an ECU pinout as well.

n_senn

When I get this thing finished ill do a quick 'n' dirty write up....

im using an LX wiring harness and so far i am adding Knock Sensor wiring and VTEC wiring

Still have to find out where the second VTEC wire needs to pin at for an OBD2B ECU

I have also changed out the distributor since the harness didnt match the JDM distributor

n_senn

Ok.... I decided to take the plunge and figure it out as I go

I have the engine in the car and it DOES start

LOTS to do yet .... A/C compressor... power steering pump.... more wiring

A few hurdles left such as figuring out how to work the EVAP system etc.

I couldn't get the car to start for quite awhile and then I figured out where that ground wire went....

Cranked right up....The ground at the thermostat neck is obviously quite important

When i get this thing ironed out i'll write it up

n_senn

OK.... I just about have everything finished....finally got some time to work on it.....

I am going out to buy a used TB tomorrow..... I am throwing a code 7...code 14...and code 38

The TPS got cracked on the install.... no BIG deal BC i guess I need the 2 wire IACV

If the TB solves the idling issues I will iron out what to do with the evap system tomorrow....

n_senn

Ok..... so I modded the 3 stage vtec intake manifold to accept a 2 wire IACV.... im pretty happy with the results

I got a different TB from the salvage yard and an IACV

I am still having some idle problems though not as bad

The CEL codes are gone but......

I am going to have to do some research and find out what IACV and TB are compatible

Just to try it I pulled a 2 wire IACV and TB off of a 96 accord 4 cyl

The CEL codes are gone but I am not sure that the computer likes the parts

It is still idling rough though not as bad.... the computer tries to "catch"up it is just slow

Does anyone know what IACV and TB work for sure for this application?

A manual tranny EX or HX??? Any automatics???

apexi_rsx

automatics have a 3 wire iacv. any iacv from 92-00 civic with a manual transmission will work. any MT t/b will work. b16-b18-b20 etc.. im assuming the motor is a manual as well

customy8

The y8 tb is used on this engine from the factory, most of every little part you need should be from a y8, grab a hx d16y5 wire harness to help with adding one vtec and egr to your wiring

94EG8

Any '92 - '95 IACV should work, they all use a 2 wire linear IACV, automatic or manual, integra will also work (except ITR/CTR)

DC88HF

Did you ever figure out how to wire the 16V low and 16V high solenoids with the J11 ecu? I know how they go for the 003, but I need the J11 pinout. Thanks!

94EG8

Should be the very same.

DC88HF

They aren't the same. The J11 is obd2b the connectors are different and numbering different. VTEC isn't even on the same connector. It may be similar though. Move a 16V high wire and use its spot for the 16V low. I'm not certain. I think Big[V] would know. Thank you for the reply though.

94EG8

Didn't realize it was OBD2B.

n_senn

OK... I am back to this project..... life happened for awhile.... I don't remember exactly where I was at.... I DO remember that the car will start but runs like crap.... I need a TPS and IACV that the computer will be happy with if I remember correctly..... any one know if the ecu will be happy with any EX manual tranny TPS? I forgot everything I learned from my research about this swap and my old computer died so no bookmarks. Will most OBD2A electronics work with OBD2B ECU? Just different wiring and some plugs right? Thanks

94EG8

Your TPS will work fine, D, B, F, H-series TPS sensors are all the same. There's very little that's different in terms of components between OBD2A and OBD2B, its mostly the ECU itself.

n_senn

As best as I can figure it is some engine control sensor/valve..... unless there is a crazy vacuum leak.... I have a TB/TPS from a junkyard off of god know what... some random civic/accord.... I dont remember..... the junkyard didnt have what I wanted when I was there.... I remember that...... I have what seems to be the right style of IACV ..... 2 wire mod was done when I started this thing..... might need to check ecu pin-outs to verify everything is is its proped place...... the MAP sensor is the right one I believe..... it matches the part number off of e-bay for one being sold as a 99 ex..... the only code I have ATM is 38..... something to do with the v-tec... it is running like complete *** though.... like 250 rpm and barely running..... if the TPS and MAP sensor are right I suspect the IACV is bad or there is a vacuum leak from when I removed the Intake to drill and tap for the 2 wire IACV....... the IACV must be off of a manual tranny correct?
thanks

94EG8

MAP sensors are all the same as well between D/B/F/H-series engines (other than some use a firewall mounted with a vacuum line running to the throttlebody)

Code 38? You might want to check that again, codes 20 and 21 are for vtec. I can't even find a mention of code 38 anywhere.

Make sure everything is plugged in the right place, also you did calibrate the TPS sensor when you installed it right? and used a new or good used gasket?

The IACV needs to be from a manual Y8, Y5 or any OBD1 D or B-series engine (except D15Z1 which IIRC has a slightly different bolt pattern and ITR/CTR which definitely does)

djslim23

I'd recommend you start with a fresh OBD2a engine harness and then add the necessary wires. If the harness is from a vtec, you'll only need to add one vtec wire and the egr wiring. If the harness is from a non-vtec, you'll need to add both vtecs, egr wiring, and the knock sensor wire. I didn't catch whether you were still using the d15b intake mani, but if not, you won't need the egr and necessary wiring. Like said above, you need to match the intake manifold to the transmission (a/t or m/t). The d15b MT* IACV is on the intake mani itself, not the TB, but the d15b AT* IACV is on the TB. Sounds like some of your problems could be resulting from your jimmy rigged IACV? I would suggest swapping a MT EX or HX manifold. With the EX you will avoid the EGR all together.
*fixed


Check out my thread for more details on the wiring and whatnot, hope it helps.

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/jdm-d15b-3-stage-p2j-ecu-egr-o2-sensor-wiring-checklist-pics-2802636/

94EG8

Other way around.

djslim23

Ahh shoot, my mistake. I knew they were different, I forgot which way. Sorry about that. -fixed

Ayeso

I know this is a pretty old post but just thought I'd share my experience.

I just did this swap this weekend and got everything working correctly.

Code 38 IS secondary VTEC on the P2J-J11 ECU

The 2 VTEC wires on OBD2B are B12 and B24. Hope this helps anyone who stumbles across this topic!