Hondata

Hello

I recently purchased a second hand, unused S300 on a P28 ECU.

Upon connecting to the car, and powering up, I was requested to upgrade the firmware. That Was successful.
I then registered but still not able to upload or data log. I tried in another known goo car with a stock engine harness etc (obd1 p06) and still the same issue.

S manager shows "driver installed" and online, even if the car is off and I can see the red light flashing on the board the same if the ECU is completely disconnected.. is that normal / expected? I can't see anywhere online that states it should be.

I want to run this in an obd2A car (b16B) that is running rywire obd2a engine harness with obd1 plugs this runs the standard PCT ECU with a conversion harness without issue.

https://www.rywire.com/product-p/b2-base.htm (This harness)

Is jumper J12 cut inside the ECU?

Spunkster wrote: Tue Apr 22, 2025 9:14 am Is jumper J12 cut inside the ECU?

Yes, J12 has been removed.
Can you confirm if I should be able to see it online in Smanager with it unplugged from the car ?

It will show online but will not allow you to upload unless the ECU is plugged in and the ignition is on.

Okay. That’s good to know, I can only set registration info.
I am not able to upload a map when the ignition is on, I’ve tried this on two cars, one 92-95 civic obd1 without any modifications to loom and it’s a known good car. And one 96-98 obd2A civic with a rywire harness as per my original post.

I wondered if it took a while to fully register with Hondata servers or something?

Post pictures of the bottom of the ecu showing the soldering for the s300.

Spunkster wrote: Tue Apr 22, 2025 12:50 pm Post pictures of the bottom of the ecu showing the soldering for the s300.

See attached :)

Send an email to supports <at> hondata.com with the following and I will issue an RMA and give you further
instructions:

Name:
Address:
Phone:
Email:
Serial#:
Description of problem:

include a link to this thread

Spunkster wrote: Tue Apr 22, 2025 2:42 pm Send an email to supports <at> hondata.com with the following and I will issue an RMA and give you further
instructions:

Name:
Address:
Phone:
Email:
Serial#:
Description of problem:

include a link to this thread

I have sent one in. I am based in the UK. The ECU was purchased originally through Tegiwa in the UK.