Hello everyone, new to this forum and in need of some help and guidance… I have a 2001 c3500hd with p1220 & p1221 and with the dreaded REP on the dash!
replaced the throttle body due to a p1516 but no longer have that code. I’ve changed the tps sensor and app sensor.
Although I changed the tps, I checked the voltage on tps1 & tps2…
I noticed that I got diff readings on tps1
at WOT… Idle….and closed..
but when I checked tps2, I just got one reading through the movement of the butterfly….
what should the tps be reading???
Any help would be appreciated
