only code coming up i replaced it twice changed the iac checkd the voltage to it an cannot figure out whats rong

 

with tps installed and electrical connector plugged in and ignition on, but not running -
probe the pins on the tps connector. seems like it should be something like 1.2 volts at idle up to 4.something at wot.

^check those numbers in the service manual. i'm not sure they're right, as its just right off the top of my head and i'm too lazy to look it up.

also look at your tps wiring all the way back to the pcm, looking for pinching, breaks, rodent chewing, etc, and anything that might short 12 volt or 5 volts onto the pcm wiring that's supposed to be in the 1-4 volt range.

 

i think the book sed 5v mines at 5 an a half this all jus happend to i took the truck around the block came home shut it off fired it back up an jumped up 2 2 grand on the tach

 

of the 3 pins in the connector, i think one is 5volts, another is variable voltage for signal out, and the other is ground. the signal out voltage should be low at idle (1.2 or .6 or something), with a smooth curve up to wide open.

questions -
what's your signal out?

you said you already replaced it twice. so do all 3 sensors produce the exact same result?

 

i think it was around .6 they all were the same would the iac cause this **** to goes nuts?

 

i don't think so.

while there is a lot of interaction between the tps and iac, they have their own wiring, and perform their own separate functions.

tps tells the pcm where how deep your foot is into the throttle (0 - wot)

when tps/throttle is at zero (and throttle plate is closed), then the IAC runs the pintle in/out to achieve desired idle speed.

your pcm is measuring tps output signal as being too high. if your output signal is 5.5, that's above what is expected... and the pcm recognizes that as wrong.

HOWEVER, anything's possible with those stupid sensors. your OBD code might be unimportant and the 2000 rpm idle could well be IAC malfunction or dirty. but - while the IAC might be causing improper idle, i don't think the IAC is causing the TPS high. something else is doing that.

 

ive checkd all the wiring to make nothins crimped an the grounds are good any idea if the pcms goin bad its done this before but the tps was the problem an even with everything fine the idle kinda jumps or sounds like its cammed

 

Got a scanner that can show real time data? Plug it in, and have a look at TPS. If you don't happen to have one handy, call around, and find a parts store that does.

 

What do you mean a scanne that shows real time data ? An jbd code reader?

 

Need to be able to see what the sensors are telling the PCM. Some of the 'code readers', are just that, and that is ALL they will do. Others are a bit more versatile, and can also be used to see what is happening while the engine is running. Being able to see what values the PCM is getting from various sensors is a must for ease of diagnosis.