ecm relay wiring problem

[machrcode]

I have a 93 ranger 4 cyl and the truck will not run. With the ecm relay removed and the key is on I have power on all 4 leads so needless to say the relay can not do its job I also unpluged the computer and it is still the same way I thought that may have been the problem .
Does anyone have any ideas or have had this problem please let me know thanks, Nick

 

[shadetree]

Yellow wire supplies power from eng compartment fuse box when ignition is turned on. This wire goes to the relay contact and also to the computer pin #1.

Rd/lt grn wire also goes to the fuse box to a power diode, and to the relay coil.

Red goes from the relay contacts to supply power to other systems, computer, injectors, other sensors.

Blk/wh wire is ground for the relay coil. If you have voltage on this contact, I would suspect the ground wire is open. Depending on how you checked it. Run a jumper from the contact to a solid ground(battery)and see what happens.

Having voltage on this contact with the relay out of the socket is kind of a puzzler. Possibly it is shorted to a hot wire, and open to ground at the same time, else if it shorted to hot it would blow the hot fuse. I don't know your checking methods, so can't really say.shady

 

[machrcode]

I was checking from the relay terminals to the battery with a test light and all 4 are hot with the key on and computer unpluged. not sure what you ment by grounding the black/ white wire should the relay be in or out? I did loose power to one terminal by disconnect the mass air flow sensor if that is starting to make any sense to you thanks , Nick

 

[Earl43P]

That fusebox is removable.
I suggest you disconnect the battery, dismount the fusebox, invert it and inspect the wiring to those relay terminals. Won't take you very long. May have them melted together.

Next, I believe I have 93 schematics that will cover your wiring in that area. PM me your e-mail address.

 

[shadetree]

Yeah, you're going to have to look at the bottom of the box. With the relay out of the socket, you should not have any power on the red or blk/wht wires.shady

 

[machrcode]

Thanks for all the input I finally figured it out the idiot I bought the truck from took the battery out and put another in and yanked the 2 pin connector off the ground cable it pluged in under the fuse box and caused all kinds of a mess now I just have to put everything I tore apart back together thanks again, Nick