I threw in my ecu that i recently bought from someone on here and first day it worked normal. Temperature dropped below freezing and when i started car the next day i got a constant CEL with no codes in the "error code" tab in smanager. I opened up the ecu and found some iffy looking solders. Ive never soldered a ecu and was hoping to not have to but if someone could tell me which need the most attention it'd help.

ECU is a p06-A01

 

This is why I never recommend buying used electronics without a warranty.

The issue could be the ecu its self or the s300 module.

1. Check if the unit is a counterfeit unit.
http://www.hondata.com/s300_counterfeit.html

2. Open the latest smanager software and connect to the ecu with the key on/engine off. Click online then click erase ecu. This will re-set the s300 module.

3. Upload a calibration & see if the issue occurs again.

 

I checked it out and it is not counterfeit, thankfully.

Ill try the reset when it gets above 0 degrees but i believe it has to do with a bad solder some where. Doesn't hurt to hope its something simple like a reset.

Can you perhaps tell if any of the solders are bad?