I have a HOnda Oddy 97's (originally with F22B6 USDM) with the F22B JDM swap. I finally found the socket near the oil pump where the original TDC/CKP sensor was connected. I believe my car now has an OBD1 dizzy (2 plugs/ 9 pins total). I found that there is a matching four pin plug connected to the original socket. So I did a continuity test btw the 9 pins in the dizzy and the 4 pins on that plug and found that all 4 wires (two TDC and 2 CKP wires) are connected to a single pin on the OBD1 dizzy connector. They're all connected to the ignition input signal (yel/Gr) pin (also called ICM ingnitor). Is the correct?

Now my guess is that's because the OBD2 ECU expects a some sort of signal from the red/green (TDC) and blue/white (CKP) so the swaper connected them to the ICM ignitor wire on the dizzy. I noticed if I unplug that plug the car will churn but not start. However, are there not special wires on the dizzy for each of the 4 wires in the crank?


I tried to run the car with a chipped p75 OBD1 ECU (which runs my car fine) connected with an OBD2b to OBD1 harness convertor and it runs fine.

But when I connect it to the original OBD2 ecu, the car throws misfire codes for all 4 cyl and idles horribly (esp when hot). Cold start is no problem until about 7 km when the hot engine start to stall at stop signals and is hard to keep from stalling even on if I leave the car on PARK. Once the hot car restarts it's on a very low bogged down idle (with a little shake) until I rev it. If I let it cool down, then it restarts fine.

So my question is: What is going on?

should I do the bypass trick (at the ECU) to solve the misfires with the OBD2 ecu? Could the misfires also lead to low mileage? Btw, my low mileage is on both ecus. I can't read the misfire (if any) with OBD1 since there's not connector to read codes in the car (which is obd2 to start with).


I was told that until I replace the sensor in the crank, my misfire problem will not be solved. e already got all the part to make this engine OBD2 compliant (oil pump houseing, spoket, crankshaft spoket, TDC/CKP sensor).

The second question: If i were to put the sensor back at the oil pump, and connect the socket to the sensor, would I need to replace the dizzy (to the original OBD2b one) or could I just run the car with the same OBD1 dizzy? Reason I ask is that I'm planning on doing this mod this summer and want to know if i'd run into any probs.

Thanks in advance for any help