S300 v3 Limp Mode

[qwertynull]

Hello. I have troubles with my hondata installed on P28 ECU.
When I started the car, it immediately went into Limp Mode and displayed the CEL.
I can not read error codes when hondata is still running in limp mode.
According to my observations it seems to be due to the temperature
Previously, it all began at -20 degrees. Now at +5 Celsius.
Then when I drive a car for some time, the check is turned off and everything is good. The colder the more I need to drive so that the CEL turns off.
(about 30 minutes at 0 degrees Celsius)
I replaced all the capacitors, it did not help.
I tried to update the firmware several times, this also did not help.

Please, help me.

- serial: 30169
- version of software: 2.6.5.0
- jdm accord euro-r/h22a stock engine

20.11.2016.skl

[Spunkster]

It sounds like there may be a cold solder joint on the ECU socketing. Can you post pictures of all the solder joints on the bottom of the ECU?

[qwertynull]

photo_2017-10-24_10-54-23.jpg

photo_2017-10-24_10-54-18.jpg

photo_2017-10-24_10-54-15.jpg

photo_2017-10-24_10-53-59.jpg

[Spunkster]

It looks like some of those may not be good solder joints. You should try reflowing all of them.

[qwertynull]

Ok, thanks, I will try

[qwertynull]

Hi, I soldered all the connections, it did not help. I also checked the presence of a signal in the wiring from the temperature sensor - all ok. Are there any other ideas?

[Spunkster]

Try the s300 in a known working ECU that already has an s300.

[qwertynull]

Ok, JDM ecu is suitable to this hondata or I need to use only USDM ecu?

[Spunkster]

It would have to be a USDM ECU.