I just received my P2P ECU to possible fix problems in a previous thread but it doesn't connect up all the way and was wondering if there was a way to fix this? Orginally had a P2M

Orginal thread: https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/97-hx-chassis-hx-ecu-y5-block-y8-head-y8-im-many-cel-codes-running-problems-3120544/

 

P2M


P2P

 

Why did you get a P2P?

 

Why did you get a P2P?
Edit. Never mind. Stop starting new threads. This seems to be the third one on the exact same issue.

Looks like you'll need an adapter harness?

http://hondata.com/techecuid.html

This is why I don't recommend doing these Frankenstein swaps.

 

Is that an automatic HX wiring harness in your car still?
If I were you, i'd just get the necessary tools for a chipped ECU and be done with that crap.

 

You need an OBD2A ('96 - '98) P2P or an OBD2A to OBD2B conversion harness.

 

I was told to start new thread

and I didnt know it was like this when I bought it

Yes it is

 

 

Btw, the HX is a P2N.

 

Isn't the P2M (37820-P2M-A71) for the OBD2b 99-00 Civic HX/CVT?

If so, it looks like the many CEL codes for the OP's original set up (97 Civic HX/P2M ECU) were probably caused by an OBD2a/OBD2b incompatibility between the car and ECU.

 

So it is. I didn't realize the CVT version had a completely different ECU code, normally it's only the revision that changes between the automatic and 5 speed version of an ECU. My HX knowledge is a little lacking as we never had them over here.

 

I only learned this^ while trying to help the OP with his earlier threads. But I think the 96-98 Civic HX/CVT uses the OBD2a P2N, whereas the 99-00 Civic HX/CVT uses the OBD2b P2M. This may have caused the many the CEL codes reported in the OP's other threads.

 

Without actually looking it up I can't see the ECU code changing, just the revision. HXs are all OBD2A including '99 - '00 models.

 

IF I'm reading the service manual correctly, all 96-00 Civic HX/5-speed are OBD2a. In contrast, the 96-98 Civic HX/CVT are OBD2a whereas 99-00 Civic HX/CVT are OBD2b.

 

Well #@%!

Why Honda, Why?!

 

It sure would be interesting to have a long talk with a Honda engineer.

 

Although as mentioned some HX info needed for certain swaps is limited I've never heard or seen this claim of OBD2A for the 96-00 HX manual.

My understanding is the change from OBD2A to 2B in 99 was a federal mandate and had nothing to do with what Honda "wanted" to do or whether it was auto or manual.

Why would a 2000 Civic HX with a manual be OBD2A when every other vehicle regardless of make, model and manufacture for the same year be OBD2B?

Would it have anything to do with the intended market/country the vehicle was intended for?

Curious. In for info

 

Its confirmed. all 96-00 civic hx were obd2a, all 96-98 cvt were obd2a and 99-00 cvt were obd2b. In 96-98 cvt transmission control module was sitting on driver side, 99-00 cvt transmission control module was kept inside the ecu itself. I am doing a project build consisting of the d15b 3 stage vtec, somewhat similar to the hx but with wild cam vtec engaging at 5300rpm. I have to stick to auto so I've been collecting stuff here and there to make it work. So far with a regular 4speed auto I've been getting some damn good gas mileage while having fun hitting vtec as well.