Thanks. It’s my daily, i put 20-40 miles/day on it easily. A/F codes came back, I’ll replace those sensors first, then do another throttle position relearn.What you are talking about is a custom flash tune, but your truck is reporting it cannot enter closed loop fueling. I don't think any respectable tuner will tune an ECU that is reporting trouble codes.
How much have you driven it? I know it must be annoying to drive due to the high idle, but I think it needs some miles if the only codes you see are for Bank 1 and 2 closed loop control.
Did all of the codes come back? (P0031, P0051, P0037, P0057) If so check that fuse again. Maybe you have a short. You should be able to use a multimeter and check the resistance between the two wires of the same color on the sensors. Those should be the heater wires. Normal range is between 1.8 to 2.4 ohms for the front sensors and 9.9 to 13.3 ohms for the rear sensors. Check all four.Thanks. It’s my daily, i put 20-40 miles/day on it easily. A/F codes came back, I’ll replace those sensors first, then do another throttle position relearn.
When the truck is running the battery voltage should be 13.5 or so up to 14.5-ish as long as the alternator is working. You shouldn't need to worry about this, but maybe check the voltage manually just to rule it out.Question, on the final procedure for relearning the idle speed for the frontier, one of the requirements is that I have a 12.9 V charge. Should I put the thing on a charger to read that? Seems to me a fully charged battery is about 12.7. Of course I could measure my voltage and see what it is at after driving and warming everything else up, but I have not heard anyone mention the charger so I’m just curious what the normal procedure is for this
glad its fixed!! - I think it took mine 7 or 8 times (sorry I didn't reply sooner, yes that is the source I used as well)Everyone, thanks so much for your inputs. TRUCK IS FIXED. I did the idle relearn for the 10th (or 15th? 🤔) time today. And it finally dropped idles! Truck drives like a dream again!