So, here is my situation. My car has a persistant code 9, which is an issue with the CYP sensor inside the distributor, which is keeping it from starting up without cranking it a few times. i have changed the distributor around 4 times since honda designed it that way, the last time throwing in a carquest part. did not fix the problem. I talked with my colleges Honda instructor, and he suggested that it is most likely either a bad wire or the ECM. I did an electrical test, and found a super high resistance, out into the Kohm range. I told my Engine repair instructor about the high resistance and he said that there was corrosion. Not wanting to go down the rabbit hole that the wiring harness is, i decided to change the ecm. I bought a CArdone remanufactured ecm from Advance, made sure the part numbers were right and installed the new ecm. It worked fine, for the first 10 times or so i cranked it.Then when i was trying to leave work, it would crank but not start. Thankfully i was able to get a jump and made it home. Next morning, would not even start, but it would crank.There were also no DTC's for it. Replaced the aftermarket ecm with the original, and it turned over like it did before. My professors both told me that the aftermarket ecm for my car does not need to be programmed. After saying all of that, my question is, did i do something wrong when i reinstalled it, or do i just have a bad part?

 

AFAIK, code 9 means the ECU isn't reading the information from the CYP (cylinder position) sensor.
Which could mean the sensor, the wiring between the sensor and ECU and/or ECU??
Measuring high resistance in the wiring suggests the wiring has an issue

Introducing another ECU to the system is adding another variable
Which makes things more complicated.
If the engine cranks and would not start then why would getting a jump start the engine?

Sorry, I don't know how to answer your question.

 

So i only tried jumping as i thought something was wrong with the starting/charging system, and it started after being jump. but my suspicions abut the system wee wrong when i placed the OE ECM back in. The code 9 went away when i initially placed the aftermarket ECM in, so i just assumed that the wire was fine and the ecm actually was bad.