mojo_jojo77777

Ok, so I'm running into some dilemmas before attempting this swap. My 98 ITR currently has a USDM b18c5 in it, (but from another 98 ITR) original blew with last owner. And the owner before me, was running a P28 OBD1 ecu with a jumper harness. Well, the motor blew, and my friend is currently working a deal with me, for his wrecked 01 ITR. What I want to do, is swap the motor into mine, and whatever else i need to get the OBD running again correctly so I can go do my state inspection on the car legitimately.

I know his ITR is an 01, so obviously it is OBD2B, while mine is OBD2A. And from what i've been seeing online, the wiring is different somewhere since I see that they sell OBD2A -> OBD1 and OBD2B -> OBD1 jumper harnesses. My question is, does anyone know where the wiring is different? I also know that his ITR has an immobilizer for the ecu, while mine does not. Any ideas how to bypass this? I have seen that "Katman" that works thru as a vender on JHPUSA, offers an immobilizer bypass for the 00-01 Integras.

My only thought right now, to get everything running the way I want, to pass inspection and emmissions correctly, would to be to swap the whole motor and engine harness to my car, as well as all the wiring behind the dashboard/steering column. Another option I was thinking, was to do the whole swap, and find an original 98/97 USDM ITR ecu and run that with the 2001 swap. But I am not sure if that would work since id be using an OBD2a ecu with a motor that was meant to be OBD2B

Any ideas would greatly be appreciated. I really want to get her back up and running

Shoalin R

swapping all the wiring behind the dash is overkill you wouldnt need to do that. just swap the whole motor, wiring harness,and ecu into the 98 from the 01. The dash wiring plays no part in the motor swap as these are to different wiring harnesses. Just everything to with thee motor wiring from the 01 to the 98 is what needs to be done.

mojo_jojo77777

Thanks for the info. Do you think the car will start though with the 2001 ecu even with the immobilizer?

FULLYBUILT2.0

I would use everything off your 98 spec for the 01 swap. You should be able to use the 98 spec engine harness for the 01 swap in. Then run a 98 spec itr ecu or get the p28 Chipped and run a itr base map if it isn't already chipped. There is nothing really hard like why your saying. No need to worry about the engine harness. If you want to use the 01 ecu then you just need the jumper harness converter. Running a 98 spec ecu to a 01 spec or the other way around should be safe I would think?

pennies_hatchie

iTrader: (1)

It won't start without the immobilizer removed or the original key that belongs to that ecu. You should use your 98 spec engine wire harness and get a 98 spec USDM itr ecu if you're looking to pass emissions.

94eg!

iTrader: (2)

Are there any differences between a 98 & 01 Engine harness? I thought the difference was just at the ECU and the chassis harness. I'm sure I'm wrong, but it's always good to know.

92vxr

Agree use harness and ecu from ur 98'. For some reason u want to use the 01' ecu you will also need the immobilizer on the steering colum from the 01' R if I'm correct

mojo_jojo77777

id have no problem getting the parts from the steering column because the itr is wrecked. but id like to also know if itd be plug and play, or would other wires behind the dash be different too. but i will try to search for a 98 ecu

92vxr

Where are u located? As far as state emissions testing? I do believe you will need the dash wiring too to run the Obd2b ecu not 100% positive though

mojo_jojo77777

TX.

JDM illmatic

sorry to hear mojo, hope you find the answers you need bro.

B serious

iTrader: (1)

The wiring is different on the harness. There's no wiring in the engine. An OBD2, OBD1 or OBD whatever harness will plug right into that engine. All the sensor plugs from 2001 are the same as 1998. Your 1998 harness will plug right into all the sensors on the 2001 engine. If it doesn't...then swap the SENSOR over, don't switch the wiring around. It's 100X easier. Use that as a guide for any B series Honda engine swap. Always swap a sensor whenever you can instead of changing wiring.

In your case:

Just run your STOCK wiring harness. Put the 2001 motor in there and EVERYTHING will plug into your 1998 harness normally. Ideally, you'd use a OBD2A USDM P73 ECU if you can find one. It's difficult to find a USDM ITR ECU, though.

How thorough is your state inspection? Do they just check that the check engine light is on? Do they actually check the ECU and the part # to make sure it's the right ECU for the right engine? Does it have to be an ECU from 2001?

If not, you can just run ANY OBD2A B series ECU. A manual LS ECU for example. Plug it right into your EXISTING wiring. Usually when people run OBD1 ECUs, they just add a sandwich harness. Remove the sandwich harness that the OBD1 ECU is plugged into. Then plug in the OBD2A ECU to pass inspection.


ECU options to run the motor after inspection:

**If your state doesn't care that you're using a jumper harness, just use an OBD2A to OBD2B jumper and your friend's ECU along with all the immobilizer parts. You can run this setup for inspection and all the time as long as your state doesn't check for jumper harnesses. This seems like a lot of work, though. But you only have to buy ONE ECU this way. Your other options are:

-Run a JDM OBD2A ITR ECU (easy to find) to run the car normally. The JDM ECUs do, however, have a 8700RPM rev limiter. I'm guessing the engine will be just fine.

-Continue to run your chipped P28 ECU with jumper harness after the inspection.

You cannot pass OBD2 plug in emissions testing in the U.S. with a JDM ECU. That's why you can't just run an OBD2A/B JDM ECU all the time.

Is your new engine JDM or USDM? If it's JDM, and your state requires you to actually have every single sensor, you will need to buy a USDM oil pump housing and take the CKF sensor from your 98 B18C5.

If your engine is JDM and your state just requires you to pass a plug in OBD2 inspection, you can do the CKF trick.

mojo_jojo77777

very imformative. thank you so much. and yeah, i didnt think it'd be so hard to search for a 98 USDM ITR ecu. the jdm ones are a dime a dozen on ebay. And here in Houston, they are very thorough. They check all safety (duh) and plug in the communicator to the car to make sure everything is good with no readiness codes. They do not look at ecu part numbers though. As long as it will communicate with the state computer, thats all they really need.

And the new engine will be a USDM b18C5 swap. So hopefully i will have luck finding a 98 ecu. If not, then maybe i'll just run that 2001 ecu with the immobilizer disabled with the jumper.

94eg!

iTrader: (2)

Will JDM OBD2-A ECU talk to OBD-2 scanner/test station? If so, you could just run a JDM ECU. Dime-a-Dozen.

***edit: Nevermind, reading above tells the answer.

"You cannot pass OBD2 plug in emissions testing in the U.S. with a JDM ECU. That's why you can't just run an OBD2A/B JDM ECU all the time."

B serious

iTrader: (1)

Any OBD2A or OBD2B ECU will communicate with a OBD2 test connector and hence will communicate to a obd2 scanner. The problem with the JDM ECU is that there's no rear O2 sensor function. That wont work in the US.

94eg!

iTrader: (2)

DOH!.....That makes perfect sense now.

99R-type

The easiest solution to your dilemma is to use the donor engine with the attached '01 engine wire harness. There shouldn't be any difference between a '98 and an '01 engine wire harness. In actuality, either harness will work and will pnp. As far as the ecu to use, you should use the USDM '98 spec obd2a ecu which plugs right up. Also, I have an USDM '98 spec ITR P73 Ecu available if you're interested in it. PM me for details.

mojo_jojo77777

thanks guys for the details. I'll be posting update pictures of the car when I get some

B serious

iTrader: (1)

Well...why use a different harness if there's no differences in the harness? Or did you mean to say leave the 2001 engine harness on the 2001 engine for less labor time? I think the engine harnesses themselves might be the same. So you're probably right if that's what u meant. The ECU side harnesses are different, however...but all the wires do go to the right plug locations at the fire wall. So...yeah, the engine harnesses should be the same.

An OBD2A USDM ITR ECU is the best solution for the OP...it's good for him that u have one.

94eg!

iTrader: (2)

Engine harnesses could be different. Part numbers are 32110-P73-A01 for 98 and 32110-P73-A02 for 01. You never know though till you try.

Tyrant_007

iTrader: (1)

If you have the whole '01 car, I'd install all the '01 ecu/immobilizer stuffs just to have that 1 thin layer of security.

Steady R

the difference between 98spec and 01spec was the evap purge valve uses a different style electrical connector.

that was the only difference i noticed when i performed the swap

mojo_jojo77777

Hmm. So everything else plugged right up? Did you end up using the 98 harness and swap the connector from the 01 to the @8 harness? Or just used the 01 harness?

Steady R

the harness is the same and interchangeable. You just have to keep the purge valve to same as the engine harness

01 engine harness- 01 purge valve
98 engine harness- 98 purge valve

When i did the swap i just swaped over to a 01 purge valve

mr_munro

Thats weird...my 01 ITR (AUDM) is OBD2A...