Hondata

ok, relay for wideband added. relay for ecu power added.

tried 3 different main relays, and a main relay conversion harness.

all the same results.


1991 crx
b18b1/type r trans
ebay turbo
tial mvs wastegate
tial blow off valve
alpha dynamic 1000cc injectors
omnipower 4 bar map sensor
hondata 4 ...

And it will always start no matter what if I have my noco gbx45 on “override” mode feeding the charged battery more.

Going to get a more powerful battery from somewhere this weekend.

Ok so I’ve narrowed it down to a battery that won’t hold amps or volts while cranking.

First I put in a bus bar and isolated every 12+ connection on bus bar, battery (from trunk) to bus bar, to starter, to fuse box, to fan relay. S300 is now not losing memory.


Charge battery, I have a battery ...

Spunkster wrote: Fri May 10, 2024 1:32 pm Who did the socketing of the ECU for the s300?

I did, this was my 4th time doing it without any troubles.

Upon further inspection I found one of the socket pins was bent slightly and not in contact with the board.

Spunkster wrote: Thu May 09, 2024 9:33 am What is the serial number that is on the s300 board inside the ECU?

Also once I put it back in the socket it is holding the file. I wonder if it was not lined up on the socket, or bad connection.

Here it is

I will post data logs later

My s300 will lose its tune and divert back to the stock p28 map after every key cycle.

Will be fine while it is plugged into and adjusting the basemap.

I purchased this s300v3 in June 2023. Installed into a p28 a couple months ago. And have had this problem since start up a few weeks ago