1996 Ford F 150 4.9 L6

toadyboy1957 wrote: so is there anything else i need to check and does it sound like ive checked and tested everything like i should have or is there some other technique for testing what i have and thanks tyler and ben for your helpfullness

Stop focusing on the three solenoids and O2 heaters. As I stated before these are switched ground circuits and by design do not have constant grounds. Not to mention these have NOTHING to do with why your fuel pump relay is not being grounded. Stay focused on the fuel pump relay driver brother.
You have a fuel pump relay that is not grounding and the truck runs when you ground that circuit. You've already identified good circuit wiring integrity. You already know your PIP signal is good (truck would NOT run without it) and this is the only input the computer needs to run that pump! The only other input is an ignition feed (wake-up) signal.
You've confirmed powers and grounds to the computer board. (including the ignition feeds)
Two variables left.
1. you didn't perform some of the tests correctly
2. you have a pin contact issue at the ECM

There is no one test you can do that says "bad computer". You will always have a feeling of "what did I miss".
You have enough information in this thread. Next step? Re-check everything and pull the trigger. If it still doesn't start with the new ECM, you missed something in one of your testing methods.

which tests did i perform incorrectly and how would you perform these tests ??

toadyboy1957 wrote: which tests did i perform incorrectly and how would you perform these tests ??

I don't know. I wasn't there. I'm just saying that is always a factor. Did your meter have a good ground, was your backprobing tool making contact. Did you test the right wire etc etc etc

i backprobed all wires with a t pin and i used jumper wires to the meter and to the 12 VOLT test light and if i was checking grounds i had it hooked to b+ and checking powers always B- i tested every wire on the PCM and every fuse and relay on the truck I DID THE BEST JOB I KNEW TO DO

toadyboy1957 wrote: i backprobed all wires with a t pin and i used jumper wires to the meter and to the 12 VOLT test light and if i was checking grounds i had it hooked to b+ aknd checking powers always B- i tested every wire on the PCM and every fuse and relay on the truck I DID THE BEST JOB I KNEW TO DO

You did great man. No need to shout at me. You asked "what else" and I answered the only variables I could think of.

Im sorry / I was not shouting at you Paul but i want to give you and everyone here for all your Help Assistance Diagrams and Direction May God Bless You Your school in every way

one last question ???? Are you all saying because the relay was bad it took out the FUEL PUMP DRIVER AT THE PCM and somehow the GROUNDS are in some way tied to the PCM ground output ? Is this how it works????

Yes because the relay was pulling 2 amps it could have taken out the fuel pump driver . And I don't think you have a problem with any of your sensor grounds they are controlled by the pcm there won't be ground at them till the pcm wants to turn them on. They do have power from the distribution box when key is on but not ground.

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