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2001 Honda Prelude SH ECU help please!

 
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Old 01-20-2013, 04:49 AM
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2001 Honda Prelude SH ECU help please!

I have a 2001 Honda Prelude SH manual w/ ATTS. I seized my pistons driving with no oil so I had to swap motors. I brought the car to a mechanic and had him do the swap. I swapped in a 4th (92-96) JDM H22a head with a 5th Gen (97-01) USDM H22a4 block. The car will not start. I took the car from the mechanic because he was garbage and brought it to Honda. After a diagnostic, Honda told me their is no spark, no fuel and no communication between the ECU and the motor. I believe the ECU that isn't communicating with the motor is a stock ECU. Honda's price for their ECU is too expensive ($950). I'm going to go elsewhere to find an ECU for cheaper but I'm not sure which ECU I need. Which ECU do I need? Be specific please because I'm new to the Honda game and I'm not familiar with all the specs. In need of help! My cars been sitting since July. Please help me end this misery, thank you.
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Old 01-20-2013, 04:58 AM
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Re: 2001 Honda Prelude SH ECU help please!

you came to the right place. i cant really help but there are several people that can.. do you got any pics?
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Old 01-20-2013, 05:01 AM
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Re: 2001 Honda Prelude SH ECU help please!

Right now, no. I got it over the summer and had it for less then a month before i blew the motor. The mechanic I had do the swap had my car since the summer time. He's a real low life. I just hope I can get the help I need to get this car up and running and finally enjoy my Lude. That'll get my 2013 started just right.
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Old 01-20-2013, 05:40 AM
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Re: 2001 Honda Prelude SH ECU help please!

are you using the jdm distributor or did you swap over the usdm one?
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Old 01-20-2013, 09:50 AM
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Re: 2001 Honda Prelude SH ECU help please!

do you know if the ecu is the original one, or if it has been swapped to OBD1?

this post explains the wiring that must be done to swap a JDM h22 to a USDM shell. OBD1 <-> OBD2 (motor/distributor swapping)

if you kept the OBD2 ecu from the original motor, you will have to change the distributor from the internal coil distributor found on the JDM h22 (obd1), to the external coil distributor that was on your original engine (obd2).

you basically need to change the engine from OBD1 to OBD2, in order for the computer to communicate with it. or you could change the computer to OBD1 (by purchasing a new one from a 94-96 lude)

edit: also, Welcome to the site! go grab a manual from here! http://www.preludezone.com/general-t...e-manuals.html
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Old 01-20-2013, 10:38 AM
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Re: 2001 Honda Prelude SH ECU help please!

I'm not sure if the distributor in the car now is the original USDM external coil or the JDM internal coil. I think it's the original external USDM because that was on the motor I damaged. I don't think my asshole mechanic would have went out of his way to get a JDM distributor. He either grabbed the USDM distributor from the damaged H22a4, or there was already a USDM distributor attached to the swap. As for the ECU, I didn't see which ECU I have in the car now but I know for a fact it's OBD2. I will know tomorrow when I go to Honda and look at the ECU for myself.
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Old 01-20-2013, 10:44 AM
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Re: 2001 Honda Prelude SH ECU help please!

the internal coil distributor should have came already on the JDM h22. do you still have the old engine? or have access to it?

edit: here is another thread you may want to read to get a better idea of what needs to be done: My H22A4 to JDM H22A Swap thread.

Last edited by rocker22dallas; 01-20-2013 at 10:49 AM.
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Old 01-20-2013, 11:32 AM
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Re: 2001 Honda Prelude SH ECU help please!

No I don't have access to the old motor. The ****boy mechanic junked it and pocketed the $$$. The JDM internal coil isn't on the way because I didn't order this motor. I got this motor from my brother. That's why I think the loser mechanic used what he had and went with the USDM external coil distributor.
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Old 01-20-2013, 11:39 AM
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Re: 2001 Honda Prelude SH ECU help please!

Quote:
Originally Posted by Martinb123 View Post
Hey Im actually swapping my h22a4 for a jdm h22a.
I just got mine in and motor is running, still have to hook everything else up

Everything you need to swap:
Oil pump
Crank sensor and the other one connected to it.
Vtec solenoid
I swapped my fuel rail. Looked to be in better condition
Do not swap the intake manifold. Jdm is suppose to be better
Just swap over your throttle body
U pointed out 2 outlets on the back of the jdm and 3 on the usdm. But the usdm has one of them capped off so no need.
Then the jdm has a side port. Just Cap it off.

Whatever you do do not forget to swap over you sprockets on the crank. The jdm do not have little markings for the sensors.
First sprocket(little one) has a back plate behind it.with 2little tips pointing outwards... Very important. And the balancer sprocket has like 10 thick metal sensor reading thingys. That is very important too. (I didn't notice that and motor would not start with the jdm sprocket for 3 days while my friend came over and asked me if I swapped that. Then bam it fired up.

Put some new plugs in it . The jdm motor will most likely have original plugs still. Mine did. Since it was only at 60k
that is from the thread i linked in my last post. if you could post pics or try to get as much information as to what was swapped and what you either already have or what you need, we could get a much better idea of what needs to be done to get your 'lude up and running.

does your distributor look like this:

or this:

Last edited by rocker22dallas; 01-20-2013 at 11:43 AM.
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Old 01-20-2013, 11:45 AM
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Re: 2001 Honda Prelude SH ECU help please!

Tomorrow when I go to Honda, I'm going to take pics of the engine bay and post them up before I go looking for a reasonably priced compatible ECU.
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Old 01-20-2013, 12:05 PM
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Re: 2001 Honda Prelude SH ECU help please!

it depends on what was swapped over on if you need the new ECU or if you need the rest of the swap. i believe you can run the engine with an obd2 engine harness, with an OBD1 ecu, but could be wrong. i'm trying to find a thread that shows all the options with a swap.

here is another thread to read: still confused about h22a swap

im not sure if you are trying to learn what all needs to be done or what, honda will be super expensive, will be much simpler and cheaper to do it yourself or get an independent mechanic that you trust. where are you located?
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Old 01-20-2013, 06:51 PM
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Re: 2001 Honda Prelude SH ECU help please!

Learning about the car more will help me, but my priority of course is to have the car running strong! Unfortunately I don't have an independent mechanic I can trust. I'm in the mean streets of NY so my best bet is to deal with Honda. Especially after this asshole mechanic played me like a piano for 6 months.
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Old 01-20-2013, 10:38 PM
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Re: 2001 Honda Prelude SH ECU help please!

wait wait, you have an SH Prelude, but the mechanic dropped in an h22a motor? Hope he swapped in a base transmission as well or else you won't be driving the car very far, cause your ATTS unit and transmission won't mate up with that block.

As for not starting, are you using the original ECU that came with the car? Did the mechanic swap over the oil pump, crank sensor, dizzy, injectors, motor harness from the old motor to the new motor? Is your check engine light on? If so, why is it on?
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Old 01-21-2013, 11:22 PM
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Re: 2001 Honda Prelude SH ECU help please!

Only the head is JDM H22a. The block is USDM H22a4. I got my hands on a ECU today. Its a used 1998 37820-P5-L03. It is compatible with my stock ECU the 37820-P5-L05. Tommorrow I'm gunna drop the ECU off at Honda and have them put it in. Today I also took some pictures of the engine bay. How do I upload the pics?
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Old 01-22-2013, 02:24 AM
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Re: 2001 Honda Prelude SH ECU help please!

is it sh or base a4 block?
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Old 01-22-2013, 03:32 AM
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Re: 2001 Honda Prelude SH ECU help please!

Whats the difference?
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Old 01-22-2013, 08:33 AM
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Re: 2001 Honda Prelude SH ECU help please!

sh block needs sh transmission, base block doesnt work with sh tranny

so Im imagining that if you have base block and sh ecu....it doesnt really work?
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Old 01-22-2013, 09:02 AM
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Re: 2001 Honda Prelude SH ECU help please!

Hopefully If its at a Honda Mechanic the compatibility issue between the block and tranny would have been noticed by the mechanic by now.
When you listed the part number for your ECU it is a P5, there is no matching up to your stock ECU that is an entirely new ECU. A very limiting one when it comes to performance down the road but fine for now. As far as no spark and such I had the same issue. But do not replace your entire ignition system over it like I did.
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Old 01-22-2013, 09:11 AM
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Re: 2001 Honda Prelude SH ECU help please!

also make sure you use the A4 headgasket
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Old 01-22-2013, 12:44 PM
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Re: 2001 Honda Prelude SH ECU help please!

Yeah if you have a 97-01 Base block it will not be compatible with the SH ATTS transmission, swapping the head is fine as long as you run all the OBD2 sensors on it [like the distributor]. Post some pictures of the engine when you get a chance, we can better help you with pictures :)

it could be something simple like missing a ground wire.
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Old 01-22-2013, 01:34 PM
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Re: 2001 Honda Prelude SH ECU help please!

I took pics. I don't know how to upload them
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Old 01-22-2013, 01:54 PM
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Re: 2001 Honda Prelude SH ECU help please!

You can upload them to you album then copy the held they give you and the insert.
Ok So
Is your car at a mechanics shop at all?
Is it at a Honda shop?
Im sure your ho da mechanic will tell you if the ATTS is compatible or if he saw a problem at all.
So save yourself the worry and just ask him. I'm sure if there was a problem your mechanic would have noticed it and said something but don't worry just ask and be certain.
Check and make sure your ECU ground is good
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Old 01-22-2013, 04:58 PM
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Re: 2001 Honda Prelude SH ECU help please!

Quote:
Originally Posted by MrAlejandroSosa View Post
I took pics. I don't know how to upload them
hey easiest way is go to tinypic.com and it will host the pics for you, free
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Old 01-22-2013, 08:46 PM
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Re: 2001 Honda Prelude SH ECU help please!

man it sounds like that mechanic was a real joy to deal with.. sorry to hear your story an hope you get your lude goin your in the right place
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Old 01-22-2013, 09:24 PM
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Re: 2001 Honda Prelude SH ECU help please!

You can put your pix on photo bucket. While at photobucket long press the pic you wanna add, you'll see some url's . Click the bottom one with [img] at each end of the info. You should see url copied. Then come back to this thread, start a quick reply, long press the white screen and 'paste' shows up. Touch the word paste and the [img] words should appear. Hit the post quick reply and you should see your photo.
You can right click cut&paste if using windows.
If none of that works try the frequently asked questions (faq) at the top of the home page and see 'how to post pictures' thread.

Btw if I'm not mistaken a sh block wouldn't mate to a base tranny.
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Old 01-23-2013, 03:15 AM
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Re: 2001 Honda Prelude SH ECU help please!

Today, Honda put in the 1998 37820-P5-L03 ECU I brought for them and the car started. They said the check engine light read the crank sensor on the block was bad. My next step is changing that and that should be the end of my long 7 month nightmare. The block is an H22a4 SH block, not a base block. The tranny is the same SH ATTS tranny I had before, not a base tranny so I should have no problems with my block and tranny mating.

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Old 01-23-2013, 10:16 AM
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Re: 2001 Honda Prelude SH ECU help please!

Glad to hear you got it running!
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Old 01-27-2013, 05:37 PM
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Re: 2001 Honda Prelude SH ECU help please!

Sweet you got it running good to hear that man!!
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Old 01-27-2013, 05:49 PM
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Re: 2001 Honda Prelude SH ECU help please!


Fix'd. Yay!
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...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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Old 01-29-2013, 10:45 PM
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Re: 2001 Honda Prelude SH ECU help please!

Not so fast preludezone!!! Honda changed the crank sensor. The car is starting and running but it seems like its going to lose power. It could be a timing issue. Honda thinks there's a problem with the distributor. I spoke w/ the old ****boy mechanic and he told me he switched the distributor over from the bad motor to the good motor so if he's not lying (which @ this point everything he says is bull****) then that distributor I'm currently running is my original OBD2 USDM 2001 5th Gen external coil distributor. That distributor is running w/ my 4th Gen 92-96 JDM H22a head and my 5th Gen 97-01 USDM H22a4 block. I THINK the distributor and block are OBD2 and the head is OBD1. I took pics and uploaded them on photobucket. How do I upload the pics in this forum? I think the problem could be a wiring situation. What do you guys think it could be?
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