Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Okay- you have to let us know for sure. Are your upstream O2 sensors wideband sensors? EQ ratio pids are used with wideband sensors. If unsure- clean off your emissions sticker under hood, it tells you sensors installed on that truck. The one graph you posted earlier showed all narrow band sensors. See graphs on post were Noah Thanked You.
Okay- changes how we look at this now. On your scanner can you find a voltage pid for each of the upstream sensors. I think Ford is around 3 volts, if you are sitting at idle and the truck is at stoich.
I'll be posting a few screen shots in a moment. So I noticed there are times that the upstream sensors current data comes through as milliamps and other times it's switches to what seems to be voltage. Does anyone know if that is supposed to happen?
Your after screen shots- jpeg 319_022136 of negative 883 microamps. I have never seen that before with a wide band sensor.Do you by chance have another scan tool or can borrow one?
I have the Otofix D1 lite and a topscan. If I remember correctly it's shows the same way on both. I can check with the TopDon topscan when I get off work. I thought that was weird as well why it would only report as voltage in a certain range. I saw a video on the scanner danner page I might re-test tonight as he mentions using global obd2 data instead.
So for some reason the topscan is measuring as milliampere and the Otofix is measuring as microampere.
I noticed a moment ago.
My commanded duty cycle is
bank 1 67.84%
bank 2 61.96 %
Scan tool says heater is on for both banks and also that the control is on.
It also says there is no fault for heater control.Â
But the pid for heater current monitor is reading 0 mA.
Does this mean the heating circuit isn't working and that's why it's showing such small measurements and only when I had it in the specific range I mentioned earlier was it hot enough to report properly?
An open heater circuit would flag a code on a wide band sensor. Your "after'' jpeg 319_022353 lambda readings and negative current flow suggest sensors are working at least on fuel enrichment. did the truck have the very rich negative fuel trims at idle before you replaced those upstream sensors?
Please do me a favour. Next time you take the truck for a drive graph the following: engine rpm, mass air flow gms/sec and a voltage pid if provided for the maf sensor. try idle, normal cruise speed and a bit of heavy throttle. Thanks.
I replaced those upstream sensors in may 2023. That's back when everything sorta began and it's just been a slow ongoing process of me checking things and trying to get everything figured out. I cant remember at the moment what they were then but might still have some scanner data I'll check.
This vehicle uses a MAP sensor like previously mentioned when I asked about the difference in intake air temperature readings. So no mass air flow on this truck.
