Trent89

by looking at my chart that came with my obd0-0bd1 ecu jumper, i know that blue, red, black, and white are supposed to be wired up to a 4 wire o2 sensor. i have the sensor but i cannot figure out what color goes to what pin on the o2 sensor. can someone point a noob in the right direction?

i have a b20 so i am not using the vtec wires: purple, and grey. but why on black does it say vtec pressure switch- o2 sensor?

4drEF

What O2 sensor do you have?
Different brands have different colors.

FieldGenEJ

it's a common ground for both the pressure switch and the o2 sensor. I believe it goes to the ecu ground on the thermostat housing.

Trent89

im not sure what brand it is. here is a pic

Trent89

so does it matter which black wire on my 12 pin ecu jumper plug goes to the o2 sensor? the 12 pin plug has 2 black wires thats whats confusing me

FieldGenEJ

I would go with pin B-2

Nick Cello

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this may help

Trent89

the rywire harness doesnt have the same wire colors as mine and my o2 sensor doesnt have the same color wires either. that does have some good info though

Trent89

what do i do with a23 black, pink, and brown wires?
what do i do with yellow wire?

4drEF

It looks like you have white, white, blue (or grey?), black.
Right?

Two whites are heater (doesn't matter which goes where)
Black is signal +
Other color is ground -

Try that.
If you get an O2 code then flip the the black and the blue.

swordofdoom

Thats a universal heated O2 sensor.
Grey is Signal -- D14
Both White is for heater
Black is Ground----GND ECU or Thermostat location.

Trent89

thanks a lot. i got my o2 wired up but now im left with the a23 black, pink, brown, and yellow wires that i dont know what to do with them

swordofdoom

Pink = Hooks to A15 on OBD0 and splices into A13 12v+ signal also goes to power up injector box also.
Brown = Ground
Yellow = Check Engine light wire on OBD0 pin B20
Black = Ground on Main relay side

You might want to double check but this should be right since its how i got mine wired up on the conversion harness.

Trent89

i hooked the pink wire up to a13 and a15
brown is hooked up to a16
black is hooked up to a2

i also replaced main relay and the car wont start. it is not getting fuel to the engine. i never hear the fuel pump prime either when i turn the key. the starter will crank