apesteguy

the other day my truck threw up the error code "p2127 tp sensor/switch E circuit Low input " on my programmer. I cleared it and it keeps coming back.
everything still works other than throttle response has been a bit odd. already tried reseating the APPS connector and unhooking the battery for half hour/resetting the sensors.


checked the resistance on APPS connector at first thought it seamed like high resistance in the midrange but im not positive.


its a 2007 f150 5.4l triton what should be my next steps?

rioryan

I've got a 2011 EcoBoost with the same issue. I tried replacing the APPS, and also the PCM with updated firmware. Same problem. I'm not sure if yours is the same but see if this test works. Take the connector off the APPS and test the voltage at the pins on each end of the connector (pin 1 and pin 6). You can use the OBD port mount as a ground. It should be exactly 5 volts on each of them. Mine reads around 3 volts on one and I'm still trying to figure out why.

rioryan

update... with the new PCM the input voltage when the connector is unplugged is 5v on both pin 1 and 6. When the connector is plugged into the pedal the voltage on pin 6 drops to 2.63. Tried the old APPS again and the voltage instead drops to 1.45

apesteguy

well we sorted out my issue. I had wired in a lightbar a week or so prior and apparently while fishing the wire through the firewall grommet I cut a wire for the throttle.