Not 100%, but there’s a spec I imagine what % they can be off before a code is thrown. Doesn’t the diagnostic code explanation have that info? If not, suggest to secure access to the car’s service data.
The plots you show look pretty good, not seeing anything obviously wrong, at least on the parameters you are displaying. Suggest to repeat, dropping enough of the shown parameters so you can show the parameters not displayed in the first plots. The sort of plot I’d suspect if the sensor was going berserk would be a series of sharp spikes in one of the curves. Or one of the curves not following the others. So far, appears to be normal, smooth transitions with all the curves more or less matching each other.
As long as the CEL is off and you have no symptoms then I would just drive it, once it gives you issues and or the CEL comes back on, then I would compare the live data…
I think the nomenclature is causing some confusion. Suggest to review the car’s service data, but as I understand this design, you press on the accel pedal, that increases the pedal sensor angle, which is read by the computer & causes the computer to command the throttle valve (located in the throttle body) to open to the commanded “Applied Throttle” value, then the electric motor in the throttle body moves the throttle valve to that position. There are duplicate sensors for the pedal angle and the throttle valve angle, and all four should match on the full range of throttle positions. The def’n of “match” presumably means they match to within a specified %. Your plot seems to show two traces, but it isn’t clear what the traces refer to. Also suggest to figure out a way to make the photo easier to read, too small now.
yellow and light blue are tp sensor position 1 and also 2 they align good
dark blue and purple are app sensor postion 1 and 2 they align good.
however tp is not matching up with app sensor positions at least when it goes wack into the limp mode, anything else i can test or do to try to draw more data to a conclusion?
When the aap is at 0%, is your foot off the pedal, the aap% should follow closely to your foot input… The tp% should follow closely to the aap% to a point depending on all the data from the ecm…
You don’t want your tp% to be at 0% or the engine will not stay running,
I’m curious to see what it looks like in limp mode…
BTW, if I am way off, please correct me, sick and head in a fog…
the video and picture 3-4 days ago here is the car running normal with CEL cleared. and the picture above you from yesterday was it running in limp
the only real difference i notice between the 2 nights and the graphs. is the numbers seem to spread out once its limped, it seems like the numbers correlate and are in spec, and randomly an APP/TP position falls out of spec and limps the car out… tho in the chart it isnt screaming " your app sensor 2 is the culprit. :/"
so not sure what to do to 1. get the app/TP more aligned 2. how to dysect the graph for more information on what to look/test next.
Thanks for re-posting an enlarged photo. Ok, APP refers to the pedal position sensor, and TP to the actual throttle valve (in the throttle body). The trace for the commanded TP isn’t shown, which is ok, less important. The photo from 3 days ago seems to show all four matching much better, especially when the APP is near zero. My guess, that’s the problem, for some reason the throttle valve itself isn’t closing as much as it should when your foot is removed or nearly remove from the accel pedal. That puts the car in limp mode b/c that problem could potentially cause uncontrollable acceleration. Perhaps the throttle valve (inside the throttle body) is sticking, or the motor that moves it isn’t working correctly. .
Note: This is all just an educated guess on my part, driveway diy’er w/ no experience in diagnosing this problem on OBD II designs. Best bet, either secure the car’s service data from the manufacturer and follow the instructions for the pertinent P codes you are seeing, or hire a pro to do the diagnosis, then you can replace the part recommended yourself if you like.
Another note: Don’t attempt to move the throttle valve manually, like used to be possible on older cable-actuated throttle valve designs. On drive-by-wire designs, that can damage the workings.
I removed and replaced the whole throttle body + sensor already. (tho bad could of got bad unit)
only 3 things left that I haven’t touched or replaced is 1. ECU 2. checking for dead spots in wires 3. APP sensor replacement
But calling up nearby shops might be the way, because to me, if its a new TB & sensor but weeks later same TB code, something is giving it a bad signal to gap really bad and throws the CEL/limp mode. Unfortunately the OB2 or graph doesn’t scream an answer for that.
You might try adding the applied throttle command to the plot by eliminating one of the other traces, since you’ve already established what that trace does.
