I have a 1j non vvti in my 89 mk3, my 1j came with the 3 wire o2 sensor, 1 blue wire and 2 black wire. I need to know what each of those wires are. I have a tweakd wiring harness and they used the 4 wire plug with O2 heater, and 1 is just o2(im guessing thats the signal???) And + and -. How cam i wire them together???
1j o2 wiring???
- Thread starter 478slimm
- Start date
The 2 black wires are for the heater and the the blue is for the signal. The sensor is grounded through the manifold.
Sorry man for the late reply, I've been gone for over a month due to work. I already have the pin out for my plug from tweakd. The plug has a ground, 12v, heater circuit, and signal. Should I wire both heater(black wires) together and is the 12v not needed???
In short: If you have a 4-wire o2 engine harness, you need a 4-wire o2 sensor.
The problem is that a 4wire setup has its own o2 signalground (not grounded through engine/exhaust)
If this engine harness signalground is shorted to engine ground, you could in theory have used a 3-wire o2.
But... engine grounds are quite noisy, and will send noise directly in to ECU through the o2 signal gnd. This in turn might fuck up TPS, MAP signals etc...a real mess.
So in short, dont do it.
Install a 4 wire sensor, and call it a day.
The problem is that a 4wire setup has its own o2 signalground (not grounded through engine/exhaust)
If this engine harness signalground is shorted to engine ground, you could in theory have used a 3-wire o2.
But... engine grounds are quite noisy, and will send noise directly in to ECU through the o2 signal gnd. This in turn might fuck up TPS, MAP signals etc...a real mess.
So in short, dont do it.
Install a 4 wire sensor, and call it a day.