ok the 20year old son did a few stupids here!
90k miles on this pretty Lude! Runs awesome... but>>>
Auto trans started to slip. My son had a chop shop drop a 5-speed in it. Loses his ONLY CHIPPED KEY for the car. Chop shop hard wires ignition direct to starter bypassing immobilizer.
Swapped out orig OBD II ecu for OBD I to get it to work correctly. Then a mis-shift, blows the H22 engine. and swaps it for a JDM H23 blue top.
OBD II got sold off. (getting good here)

Since it was parked "non-operable" CAL DMV requires STAR Smog to re-register. Surprise?

he needs a midnight smog - but needs the OBD II to get it done. - SUGGESTIONS? is this OBD II for 01 Prelude agnostic? or does it have a VIN burned on it.




.

 

u should be able to de solder the auto feature on the 0bd2 ecu i did that on mine and was able to keep immobilizer etc.. passes smoke like OEM

 

Thx and Happy New Year Hatch - however, as I wrote, he no longer has his original OBD II ecu.
He now has an OBD I. And no master key to reprogram a used OBD II.

thoughts?

 

about using H22A4 ecu with H23V:

 

Couldn't you/he just buy another ODB2 ECU...? They shouldn't be that hard to find.

 

So one of my MOST IMPORTANT QUESTIONS to the forum is:

Is the 01 Prelude OBD II ECU hard burned with the VIN# - OR -
Can I hunt for any used Honda 2001 OBD II? - IF I can, does the ECU have to be PRELUDE-H22 specific?

 

you need H22A4 99-01 ecu

 

Thanks TimiK
Here's the ECU I found recommended my 2001 Prelude H22 automatic trans
https://www.ebay.com/itm/97-01-Honda-Prelude-OEM-Ecu-Engine-computer-ECM-A-T-Part-37820-P5M-L55-/201649419944?fits=Model%3APrelude

Is the 01 Prelude OBD II ECU hard burned with the VIN#?
a

 

They are not.

 

Thx LiteraCola!!

My '01 lude is a "California car"... so its ECU shouldn't be different from any other in the U.S.
Is that a safe assumption?

If anyone on the forum would like to confirm before I go and BUY ONE ...please do so!!!

 

auto ecu will throw a code and you fail your inspection

manual ecu for manual transmission

 

Just for my own knowledge... so would that be the P5P ecu? I know the auto ECU is the P5M, but i can't find much more information than that.

 

37820-P5M-L55
restoring the car back to factory auto trans.

just wanted to confirm LiteraCola's assertion that the VIN is NOT HARD CODED on this ecu.

 

Gotcha! I must have misread. In that case, the P5M is correct.

Silly California and your emissions requirements haha

 

Do you still need a manual obd2 ecu I have one from a 99 for sell