Hondata

Could this be happening because before I uploaded the calibration to the ecu I clicked erase ecu?

The serial on the s300 is S300-2976
And I am using the 2.2.4.0 version of sManager.

I just bought a used Hondata Ecu it that is converted to obd2b.
The car that the ecu is in is a obd2a.
I have a conversion harness from a obd2a car to an obd2b ecu.
The ecu connects to my smanager. (latest production version)
But when i go to upload the calibration ( stock p28 with only injectors ...

I have disconnected the grounds, scuffed them with sandpaper then reconnected them and it didnt make a difference.

I ended up fixing the problem though, i just changed the output wire for the vtec to the a10 pin on the ecu and it seems to work fine now?

Any reason why this made it work ?

I have a turbo b16 in my civic.
I street/dyno tuned it myself, and have been running the car for few months with no computer issues.
Vtec has worked fine up until now.
I had to replace my distributor a couple weeks ago, but vtec still worked fine. ( despite the fact that the tach is a little jumpy ...

Spunkster wrote:Send in an email to support <at> hondata.com the serial number of the s300 board inside the ECU, a picture of the s300 (high quality and in focus), and a link to this thread.

I called them today and got a RA number, im gonna send it in.

Spunkster wrote:Testing it will not damage anything.

I just tested it. I tested mine in his perfectly working ecu, and it didnt connect.
I tested his in my ecu and it connected.

So im assuming my s300 chip is bad :/

Have you tired this s300 in a different ECU? It sounds like the ECU may not be powering up properly and may have been damaged.


I have not had a chance to try it in a different ecu. The only friend I have that has the s300 just got it back from the shop and being dyno tuned and does not want to ...

Do any lights come on on the s300 when you turn the key to the on position?


Yes two green lights on the s300 board when the key is switched on.
It went through the troubleshooting and the computer does not recognize that anything is plugged in dealing with hondata.
How do I go about sending it ...

I opened it up and nothing looks burnt at all. Pulled the chip out, looked front and back, and then all around the ecu board and nothing looks bad/ or burnt

The other day I decided to do a little tuning.

I have a 96 Civic obd2a with a jumper harness to obd1.
I have the hondata in a p28 with s300. It was installed by a shop.
Car was running just fine. I plugged in my laptop/the car died. And you could smell burnt electronics.
I unplugged the laptop ...