96 ranger, code p1120, tps tests good..

[tominos]

hi all, cool forum. i recently bought a 96 ranger, was a fleet vehicle and has 260k ish or so.

anywho, it's throwing a p1120, tps out of range code. i've replaced it with a new autozone sensor, didn't change anything. i've tested it with key on engine off, it's getting 5v at the signal reference, and it is getting ground, and when i modulate the throttle it goes up and down smoothly from 1 to 4ish volts. so it seems to test fine.

i'm guessing i should look at the wiring next, but i can't find any diagrams regarding the tps. how do i test the wiring back to the pcm? has anyone had to test/replace their wiring? what is the next step i should look at?

 

[cp2295]

You should be able to find a full PCM wiring diagram from your local library I have had good success there. I would test to make sure the ground is good, although if it wasn't more than likely other sensors would be bad since they have a common ground, but the wire could be broken just on the tps sensor. Also check that the connector is okay and has continuity.


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[tominos]

completely forgot about this thread haha. thanks cp2295. is there any diagrams online i can find? i've replaced the tps, and it still trips the code randomly. sometimes in 5 miles, sometimes in 300 miles. i'm thinking theres a short in the wiring somewhere. can i disconnect the wiring harness at the ecm, and the connector and check for continuity between all the wires, or do they split off to feed other things before the ecm?