Question:
I want to hook up an Air/fuel gauge on my truck but dont know which wire to hook it to on the oxygen sensor can anybody help me, there are 4 wires and i need to find the sensor signal wire.
thanks
Answers:
THEIR IS A .5 VOTE REFERENCE
FIND THE WIRE WITH .5 VOTES ON IT
YOU GOT 4 WIRES
1) .5 VOTE IN
2) GROUND IN
3) VOTE OUT
4) GROUND OUT
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i mechanic for a living,,and all you need to do is find the wire with the 0.5 volts on it that's the reference wire ,,that's the one you need,good luck hope this help,s.Uh there is no .5 volt ref as far as I know on a Ford going down there... (Or at least When I learned EEC V it doesn't use anything like that..)
2 wires (white) should be power and ground for the electric heater
1 wire (black) should be the signal wire (as the sensor creates it's own voltage)
1 wire (gray) is the return or ground wire.
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Most o2 sensors on Ford's from the factory are made by Bosch.
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Also you are looking to cut into the one with the green coating as the purple or blue ones are for Cats (and will basically give the same voltage most of the time)
Pin 1 Circuit 387, (RD-WH) Heated Oxygen Sensor H02S #11 Heater Pin 2 Circuit 391, (RD-YE) PCM Power Relay Output Pin 3 Circuit 74, (GY-LB) Heated Oxygen Sensor H02S #11 Input Pin 4 Circuit 359, (GY-RD) Signal Return. By the way, #11 means bank 1 sensor 1
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