fishuntr

FIXED IT!
OK; just a quick review. Engine just died and wuldn't start after I evidently crossed a wire while troubleshooting the A/C idle up.

what I did;
1. Check fuses; fuses look ok
2. Check for spark; have spark
3. Cuss; didn't help/
4. Consulted members this forum; got many good suggestions. Also consulted son who is a mechanic.
5. Checked relay over ECU; it was bad; replaced it; still wont start.
6. Studied manual and schematics.
7. Jumped fuel pump via test pod under hood, no help/
8. Checked main EFI relay by fuse panel inside drivers side; checked ok.
9. Checked for power to relay while cranking ( suggestion by 2ToyGuy).; no
power to plug. I originally didn't do this because I knew the engine wasn't
running. This turned out to be significant.
10. Ran a jumper directly from battery to fuel pump. (4Runner has easy access under back seat). Engine started and ran.
11. Consulted son John(Desertoy) "Dad, when you checked the fuses did you ohm them out?" "Well...uh..no, I just looked at them and they looked ok."
12. Check fuses (see #1) ohm out fuses. Found bad one on EFI circuit.
Replaced fuse; started and ran !!!

I feel like a dumb SH##.; but man am I glad I got that fixed. I did learn a lot about how my EFI circuits work. Thanks guys for all your help.

2ToyGuy

Yaaay! Glad it was an easy fix. never trust these fuses to "look" OK. They will fool you every time, as you found out. A quick shot on a multimeter is a much better test, and most of them have holes in the top that you can test them without pulling them.
And never underestimate the power of a good cussing. It can really make these trucks snap into line, sometimes

Mr.mud

There is a fine line between a challenge and a pain in the as* some times they are so close you cant see the light between them. Just think next time how much easier it will be to work truck as you now know how the computer and sensor tie together and work work with each other. Congratulations on getting your trunk on the road.