Hi! Just got check engine light..???( car drives as normal)
Obd2 reader shows P1684 fault. Was reading online about that.. something something something Google as always...anyway.
Maybe some one was facing this problem?
1.4 T-JET 150
TIA!

daggyboy said:

Hi! Just got check engine light..???( car drives as normal)
Obd2 reader shows P1684 fault. Was reading online about that.. something something something Google as always...anyway.
Maybe some one was facing this problem?
1.4 T-JET 150
TIA!

Click to expand...

Have you reset the fault? and seen if it comes back?

JackFi said:

Have you reset the fault? and seen if it comes back?

Click to expand...

Hi yes it comes back.. Now I'm driving with fault. Car runs and drives normal. Just engine check is on..

Something with throttle. P1684

P0xxx codes are generic codes.
P1xxx are manufacturer specific codes, so Google may show some results but they're unlikely to be FIAT specific.
A quick search on here suggests it's possibly to do with the throttle position sensor, but I'd suggest checking it properly with MultiECUScan. Is the vehicle still driving OK, or have you noticed anything odd?

Edit: Never mind about the FIAT specific codes, you beat me to it

Now car drives with engine check light. But time from time then stopping in traffic and letting rpms drop to idle car goes to limp mode. Switch engine off back on. Drives ok for some time.

Maybe this gonna help for some else. What to check if p1684 pop up. On weekend gonna check everything one more time. If nothing it means ecu if that car going to scrap yard..???
Also there is video on YouTube how to check ohms on electric throttle body..gonna do that also. Could be plastic gears insider throttle body also.

Pins

Update. Fixed. Cleaned thortlle butterfly valve. Remove plastic cover and cleaned everything with contact cleaner. Also tracked earth from ecu, cleaned that. All connectors ecu and from ecu cleaned. Put everything together start the car and there is no more check engine light. Test drive it, no problems. Idle much better. Maybe it was tb butterfly valve axel. In my research in other languages on p1684 says allot of different things. Bad wiring harness/earth/contacts, tb, ecu. But in my case (i think) it was dirty thortlle body valve axle (maybe). I done allot of things today..so hard to tell what was wrong..? gonna update if something comes back. But now everything looks ok. Also (add pick) forks/fins/contacts on right side for tps1 or tps2 (idk) was crossed thogeder (gently swipe whit finger fix them, maybe it was problem or i just cause that in cleaning process). Sorry for English doh..lol.