I will explain all story to get context. In 2019 (First firmware used 1903) i build my own clio williams with speeduino and don't have major issues so i'm runing it and very happy with it.
Now i'm installing a speeduino on a clio williams (same year '91 like mine) so i thought i won't have any major problem, but i have 2 problems i can't solve.
First issue - Fuel pump is not stopping after the delay with engine stopped and key on. I have checked several things about this issue. With arduino alone (without speeduino shield assembled), using tester and giving 5v via USB i see PIN7 (boost) that gives 5v and after the delay it goes down to 0v, so this is OK.
Checked also powering with 12v with speeduino shield assembled and the same, works fine.
The problem is when giving the 12v source assembled on the car, giving from key on. So the difference is that boost output is grounding the FP relay. What i see then is that arduino pin 7 doesn't go down to 0V, it keeps 5v ever. So this i what i can't understand.
I was trying one long week checking all and finally i decided to try my speeduino board. So what a surprise, when installed my ecu (my speeduino shield and arduino, but using friends .msq and also IDC cables, because we have minnor difference because i run wasted spark and my friend runs oem single coil and distributor) fuel pump works properly, stopping after the delay.
We thought that assembled speeduino we bought was failing and decided to buy a component kit to make personally a new one...
New surprise, with the new board and also new arduino i'm having the same issue than before!!!!!!! Fuel pump is not stopping after delay with engine off.....
Want to cry :\
PD: ALSO TRIED ON VVT OUPUT AND CHECKED THAT PINS USED ARE NOT DOUBLED ON TUNERSTUDIO SETTINGS
2ond issue (can be related?) - With first board we haven't readings of o2 sensor (using my own spartan2 controller with a FAE 4.9 lambda sensor). So when tried my board, 02 sensor also doesn't work properly, having strange readings for a while but major time reading 10 AFR (so 0 volts on 02 output pin). Now with this new speeduino also bought a TINYWB from DIY-EFI and also the same, only reading 10AFR all the time, except for a while it had steady value of 15AFR but never seen again after disconecting power. Last chance about that is to try my 02 sensor that came with the spartan 2 kit (it hasn't reference marked to buy another similar, only has marked 14point7 but not a reference). Do you think i need a more specific sensor than a 4.9, because FAE has crossed reference with BOSCH 4.9.
By now, i'm thinking problem should be related because i don't think lambda sensor to be a problem.
Thank you very much