hi i got a 90 ef 4 door with a sohc vtec with a obd1 jumper harness and i dont know how to wire it up

 

FAQ at top of the forum

 

your gonna have to wire the 4 wire O2 and the 2 vtec wires for pressure and switch. Look at the diagrams on the web. its pretty easy. just follow the pinouts.

I had to figure it out this way after thieves took my harness and ECu. I was given some generic jumper harness with no instructions. So needless to say, i had to do some homework to figure out which wires did what If you have an OEM 4 wire Oxygen sensor then matching up the wires should be easy. If you dont, then im guessing you are using a BOSCH Sensor. In which case, the wires are 2 black, one grey and one white.

let me find the threadh where it says what wires do what.

 

Quote:
Originally Posted by neu-b
Just checked to see where things are hooked up to: White-A6 (PO2SHTC O2 sensor heating element), White-A25 (IGP2 to main relay and to ground), Black-D14 (PHO2S O2 sensor), Gray-D22 (Sensor ground). Does that sound correct (this is on an OBD1 P28)?

According to Bosch, they gray wire is ground (check!), the signal wire is black (check) and the white wires are for the heater circuit (check!). Looks like you have it installed correctly. I would double check that you see continuity from the ECU plug to the sensor plug though.


Now all you need is to find the pinouts for the vtec pressure and Switch.