Hondata

Does the software show that it uploads?

Do you have on-board datalogging enabled in the calibration?

Post pictures showing the soldering that was done on the ECU for the s300. Include a picture of the top of the ECU circuit board too.

When I try to upload it would blink once red, stay solid red for about a second, then start and stay flashing red.

Onboard datalogging is enabled as well

Right now the car is running like it doesn’t have the unit installed at all.

It looks like there may be some bad solder joints on the 4 pin connector and the 2 14 pin connectors.

disable on-board datalogging. It does not need to be on do datalog in the software.

So resolder the pins?

And onboard datalogging was disabled

That is a starting point. Also I can see the capacitors have not been replaced in the ECU and one appears to already be leaking.

https://www.hondata.com/products/access ... acitor-kit

I have this issue as well. 91 civic. Built b18c1. P72.

J12 has been cut. J1 jumped. Solder joints look good. Capacitors are clean. No leaking.

Socketed myself.

Can't upload, doesn't show when ignition is turned on.

Info is attached.

With the USB unplugged, turn the ignition to the on position and tell me what the lights on the s300 do.