Hondata

Just to add, I experienced the same issue after upgrading to 2.5. There was an older onboard log on my ecu that seemed to corrupt any calibration I uploaded to the ecu. Clearing all datalogs on the ecu +erasing the s300 and uploading the calibration again fixed this issue for me.

UPDATE: My local Hondata dealer confirmed 3 of the smaller capacitors on the board were starting to leak. They swapped my P06 out for another since I was in a hurry and they wouldn't be able to replace the caps for another week or 2. Thanks for the help Spunkster!

Just to note, I ran into another ...

It may have a fishy smell, but it may not. Cutting J1 may or may not make it work differently. The best and cheapest thing to do would be to replace the capacitors. You could also try your s300 in a friend's ECU to rule out an s300 problem, although it sounds like an ECU issue.


Okay sure, I will ...

It sounds like it could be the capacitors in the ECU going bad. This is common on these ECUs as they are now 20 years old or more. We sell complete capacitor kits to replace them all.

https://www.hondata.com/news/capacitor

Thanks.

If the capacitors are going bad, will removing the jumper on J1 ...

I have a S300 v1 installed in a P06 (I think) with vtec, datalogging and boost components installed. I bought this whole package from a dealer about 4 years ago. 2 years ago the S300 V1 would no longer hold a tune (it would reset after I cycled the ignition and had constant red led at D1). I sent ...