I've got a 95 prelude H22 in my Accord. I haven't hooked up the ecu yet.

I would like to know...
Has anyone tried using a 97 prelude ecu (OBD2) on the 93-95 H22 (OBD1), or know someone who has; or just knows flat out if it will and why or why not?

 

it will not work. you will need a jumper harness.

OBD1 P13 has 3 plugs in it, and the OBD2 one has 4

Furthermore, unless the ECU is chiped, it will not run. OBD2 motor has a MAP sensor. If the computer does not find a map sensor, it will not run. However, if the computer is pre-tuned with crome or somethin, the computer can be programed not to look for the map signal.

I could go on and on, but long story short, its not an easy task

 

I actually hooked up a map sensor and the motor is currently running on the OBD2 Accord ECU

 

yeah but the vtec wouldn't kick would it. Also how many codes are coming up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_DC4_Fanatic &raquo;</TD></TR><TR><TD CLASS="quote">it will not work. you will need a jumper harness.

OBD1 P13 has 3 plugs in it, and the OBD2 one has 4

Furthermore, unless the ECU is chiped, it will not run. OBD2 motor has a MAP sensor. If the computer does not find a map sensor, it will not run. However, if the computer is pre-tuned with crome or somethin, the computer can be programed not to look for the map signal.

I could go on and on, but long story short, its not an easy task</TD></TR></TABLE>

wow you cant be any further off.

its not the number of plugs that neccessitates the need for a jumper harness, its the fact that the plugs and pin locations are completely different. and depending on AT or MT, the obd1 ecu has 3 plugs same as the obd2 ecu.

and ALL h22s have a map sensor, just cuz its hiding in a box on the firewall for the 92-95, doesnt mean its not there.

and no you can't tune the ecu to not look for a map, nor would there be any point to.

and lastly the real reason why a 97 ecu wont work on his car is because, it has an immobilizer built in, and unless he gets the matching key and all the immobilizer equipment wired up, it's not going to work in the car.

please do the internet a favor and dont go on anymore, keep your long story short.

 

damn dude..

relax, it isn't your internet, but when in it is you can speak for it.

Regardless, despite the things that people have said, and the obvious BS with the immobilizer, its difficult to get a straight answer on some of these conversions because some people have had more luck than others. Chris from RyWire said that other than the immobilizer, there isn't any reason that an OBD2 PCM wouldn't work, assuming that I reattached the secondary O2 sensor (for emissions).

Part of the reason why I explored this route is because there are some wires coming off the Accord OBD2 harness that i used that don't have a match on the Pin charts that I've found.

Coming off the OBD2 harness with no match on OBD1
A28 - 2WBS
A29 - VSV
C8 - K-LINE
C20 - PFSW
D15 - PTANK

Coming off the OBD1 harness with no Match to the OBD2 Harness
A11 - ESOL
A19 - ICSOL

Granted I haven't listed the Knock Sensor, IABSOL, VTS, and VTPSW that were necessary.

 

if blatently wrong information is what floats your boat then good for you.

have fun searching through a pile of bullshit wondering, what is right and what is wrong.

but besides the immobilizer there is nothing else stopping the ecu from working in your car. you can put any ecu in any car if you wanted to. since you are down to the nitty gritty, u need to go get urself two factory service manuals and match the wiring, theres no way around it.

the motor itself will work, there are plenty of people who have put obd1 h22 motors into obd2 h22 cars, and vice versa. just have to match the wires.

 

the nitty gritty is right.

But i'm consulting this forum to have questions answered, not argue semantics.

While I've looked at Helms' wiring diagrams for both cars, it is the above 7 wires that are the only ones that haven't been matched up. I need to know first what they are and second whether they have a mate or not on the other harness.

 

i would trace the wiring diagram, and see which sensors and waht not that they goto, that way u can make a better judgement as to where it goes.

they migth not always be labeled the same exact thing between the two helm manuals, so u need to do a bit of guess work per se.

 

i got to say that I have seen plenty of cheep obd1 ecu's for a h22 prelude. are you going threw this hassle to make it smog legal? I am also still wondering about the vtec, or did you already have an f-series vtec?
also dude wasn't complaining about your question but the second post.

 

Yea dude, you were correct, the Vtec does not work with the Accord ecu in there. The only reason I had to do it was because it's my daily driver and I needed to get around. Its also running really rich, which i'm sure has something to do with the ecu disparity.

I'm still looking for answers on some of those missing wires that I listed above if anyone has an easy answer to one or two of them.