[gettinafit]

Originally Posted by 03DSM-RSX

actually, it in fact DOES split. i have found that the MAP, ECT, and IAT sensors are affected by splicing the wire and splitting it to 2 ecus. I am currently finding ways to get a clean, fresh signal straight from the sensor instead of splicing it. I will certainly let you know when i find out.

I am running a dual ecu setup and currently working on a new R&D project for Hondata. I assume you already have Hondata Kpro on the RSX ecu? Once you have the electrical things able to turn on, you can check the KManager software and see what sensors are needed.

so at this point, your FIt ecu is controlling: multiplex, a/c...and what else?
RSX Kpro ecu should be controlling everything else, including OBD2. Although you can leave the "K-Line" from the Fit ecu tapped with the RSX's K-line to be able to diagnose both ecus. but when u go in for inspection sometime in the future, cut the K-Line from the Fit ecu. (K-line is the OBD2 comm line)

Originally Posted by 03DSM-RSX

i can provide pics of me testing it and showing you the before/after "splitting" the signal and its signal values. I can get them up monday when i start testing various methods. (if it doesnt rain) And yes, there ARE resistors that stem directly to the IAT/ECT sensors.

For safest measure, you dont need to give the Fit ecu the ECT reading. If the signals are not accurate, your ECT will be reading a lot lower than it is actually, and the engine will constantly be working itself to get to warmed up temp of ~180. Resulting an overheating condition that you wont know about. (this is wat i DONT want to see happen) You can simulate ECT/IAT values with the use of different resistor values for the Fit ecu to make it think its "ready".

Again, this information was stated in my reports from the last project i worked on and is confirmed by Hondata. Although Hondata is experimenting by removing those certain resistors and/or changing resistor values on the ECU itself to amplify the signal enough to provide accurate readings between 2 ecus.

I believe my buddy is going about it the second way as hondata is. he has my makeshift harness now and is pluggin things up and testing voltages. SO as for now, i'll be worrying about a/c lines and waiting on that stuff to come back as well as the header situation.... (non-existant)..... HASPORT HELP!! JHPUSA HELP!!! (Both have K20 fit's and prototype headers not released yet....)