Hello everyone, I want to said this is my first time and I need a lot of help plzs I have a 98 Sonoma 4.3L 2wd 6 cyl I have change almost every sensor before I find out the PCM it'* not sending 5 volts to the the sensors the multimeter it'* only reading 1.2 volts I try replacing the PCM with a used one I reset the passcode and it still sending only the low voltage the scanner shows a tps low voltage error, any idea of what could this be I have already spend a lot of money replacing the sensors thanks

Welcome to the forum!

Welcome to the forum.

I assume your getting a check engine light? What'* the code?

are you measuring the voltage at the PCM pin or the sensors?

Code is P0122 and I am measuring from the PCM pin

When you have your multimeter + connected to the TPS 5V source, where are you connecting the multimeter - ?

To the negative pole on the batt

When I connect the used pcm, even before trying to turn on the truck it had the same scanner code P0122 is it possible that the pcm i got had the same problem or the old code stay there for some reason ?

Oh yea, you need to clear any all codes prior to checking for new ones. Some vehicles you can disconnect the battery and the pcm will "lose" the stored codes. Others, it keeps them.

how can i clear all the codes?