CALLING ALL FAVORS IN ON THIS! > Need ECU pin out for OBD2a JDM Euro Accord TypeR H22 - Honda Prelude Forum

Spocko · 07-21-2004, 05:16 PM

ANYONE with info on how I can obtain the correct ECU pinout for this motor and ECU PLEASE email me and/or post it here. Even a link to find the Japanese Helms manual for this car will help (provided I can find someone to translate Japanese!) I can't get my swap finished without this (GD OBD2 differences > mine is a "b" evidently WTF

Spocko_1701a@yahoo.com

Artifex · 07-21-2004, 06:11 PM

Quote:

Originally posted by Spocko
ANYONE with info on how I can obtain the correct ECU pinout for this motor and ECU PLEASE email me and/or post it here. Even a link to find the Japanese Helms manual for this car will help (provided I can find someone to translate Japanese!) I can't get my swap finished without this (GD OBD2 differences > mine is a "b" evidently WTF

Spocko_1701a@yahoo.com

Is the JDM OBD2b different from USDM OBD2b?

Try this. It's a big picture, so I will give you a URL:
http://www.pgmfi.org/phorum/download...OBD2to1ab2.jpg

Spocko · 07-21-2004, 06:30 PM

I am looking for the JDM OBD2"a" > different from my USDM OBD2"b". Hence therein lies the problem > not same OBD2 type

alphajesse · 07-21-2004, 11:22 PM

All preludes use OBD2a wiring harnesses.
JDM/EDM/USDM all the same, although euro and jap cars may be missing sensors we have.

EDIT: How do I know?
I have a 2001 Prelude that was manufactured in JULY OF 2001. I bought it at the end of August 2001.
If they were ever going to switch this car to OBD2b, mine would have it.

You may have extra pins on the Euro-R harness if the ECU controlled the electric PS.

rentien · 07-21-2004, 11:58 PM

on euro-r TB's there is no idle adjusting screw, the ECU controls this, and i THINK the third wire is for this and so... it really is different and if i'm not mistaken this is what spocko is talking about

alphajesse · 07-22-2004, 12:31 AM

I have a TB without an idle adjust screw (not stock) and I have no problems. If the euro-r is without one, the IACV is in charge of the idle.

Spocko · 07-22-2004, 05:31 AM

TRUST ME on this one, the Euro R ecu is different than my OBD2 one for my USDM lude. If you look on the back of my ECU (2000), you put in 2 plugs, then there is a space, and finally put in the 3rd one. ON the EURO-R ECU, you put the 3 plugs in a row into the back of the ECU and then there is 1 left over space on the end. Hence OBD2a. The wiring harness isn't the problem. That works fine. I need to know the ECU pinouts, because there are extra wires NOT included on my wiring harness that I need to hook up to the ECU (distributer has 6 wires, not 4 like mine; IACV valve has 3 wires, not 2 like mine, etc. BUT without knowing the pin out > it is trial and error, and I don't want to go messing with something like this "trial&error".

Spocko · 07-22-2004, 05:34 AM

I wouldn't care so much about using THIS ECU except that it has a different redline than my US 5th gen, and it has different fuel and timing maps than mine. I have a VAFC, but that only does fuel > so timing wouldn't be what it was suppossed to.

Joon525 · 07-22-2004, 09:15 AM

Quote:

Originally Posted by Spocko

ON the EURO-R ECU, you put the 3 plugs in a row into the back of the ECU and then there is 1 left over space on the end. Hence OBD2a.

That's OBD2b not "a".
http://www.hondata.com/techecuid.html

rentien · 07-22-2004, 12:04 PM

whats the different redline at?

i'm running my euro-r h22a OBD I style...

Satan_SRV · 07-22-2004, 09:26 PM

like I said to you on honda-tech...you're wasting your time in my opinion. The ecu likely controls the Euro-R Electronic power steering and will give you engine codes since you don't have it, as well I don't seem to remember a much higher redline...euro-r only peaks 200 rpms higher.

Also, you bought this high end motor why not treat it to some real tuning? Just my opinion but you're going through a lot of work to use a 'stock' ecu get a 118mph speed limiter on top of it.

alphajesse · 07-23-2004, 12:45 AM

Also, if the PS is electric, it may just decide to ignore the PSP switch and not raise the idle when you steer in a parking lot.
May cause some stalling issues.

marcucci · 07-23-2004, 11:27 AM

Quote:

Originally Posted by Satan_SRV

like I said to you on honda-tech...you're wasting your time in my opinion. The ecu likely controls the Euro-R Electronic power steering and will give you engine codes since you don't have it, as well I don't seem to remember a much higher redline...euro-r only peaks 200 rpms higher.

If it's like the S2k, the EPS has nothing to do with the ECU- just like the 4WS. It obtains it's inputs in parallel or seperate from the ECU and operates independently. I'm guessing they are the same type of system.

Quote:

Also, you bought this high end motor why not treat it to some real tuning? Just my opinion but you're going through a lot of work to use a 'stock' ecu get a 118mph speed limiter on top of it.

My, aren't we Mr. Moneybags?

For some people, after they blow a wad like that on a motor, they are not ready to go blow another $1k on an ECU when the stock one will work fine.

Jesse, there is no PSP on the electric units. The rack works similar to a 4g rear 4WS rack, electric assist embedded in the motor. No fluid to pressurize. The stock alternator load sensing should function fine since the load is all electrical.

alphajesse · 07-23-2004, 10:53 PM

Quote:

Originally Posted by marcucci

Jesse, there is no PSP on the electric units. The rack works similar to a 4g rear 4WS rack, electric assist embedded in the motor. No fluid to pressurize. The stock alternator load sensing should function fine since the load is all electrical.

I was assuming that he was using 5th gen prelude steering rack and PS system.
I was saying that the car might act 'funny' with mechanical PS if the ecu didn't get the signal that engine load was higher. The Euro-R ecu likeley is missing that input, if it had electric PS (which I wasn't sure of when posting.)
I guess my post wasn't clear that I meant the ECU may cause problems if he only swapped the engine. (I'd call this a more minor problem than his harness issue, though.)