Hey guys,
Random-*** question - When you're full throttling (even with the vehicle off and ignition on), does your throttle position sensor (PID 0x11) read less than 100% on a scan tool? Only asking because every other car I've ever looked at has something like 15-ish percent at idle, but with your foot all the way down, it reads 100%. Before I go down the diagnostic chart, I just wanted to see if that was a "normal" reading (78%) for our cars, or if my pedal or throttle body may be bad. Also, if this is abnormal, is there a relearn procedure for the TPS?

Thanks!

 

This is normal. It's a drive by wire system, the throttle is electronically controlled and not 1:1 to the pedal movement. The throttle position sensor is built such that the full extent of throttle opening is less than 100% of the sensor's scale, since you every sensor will have a bit of variance and you never want to be at the edge of it's capability.

Same thing with idle throttle, there is no separate idle air valve, the throttle is held slightly open for idle.

 

Thanks! I'm used to 15-ish percent at idle or key on, engine off. But on every other car I've scanned, it's always 100% with a commanded pedal position of "to the floor". Have you a scan tool that you can check your readings and compare to mine?

 

Car is sleeping for the winter, but yes, I noticed this too. I don't know if it was 78% exactly but around there. I can check my old logs next time I'm at the computer.