i have already searched and cant find anything....

so since i cant use my jdm engine harness, and i cant find any usdm gsr harnesses i have decided to use my cx harness and add all the vtec wires. what do i need to do for my 4 wire o2 sensor? my cx harness is for a one wire o2 sensor.

 

ummm ok...

 

You'll need to run the wire from the O2 sensor heater to the ECU. I'm not sure if the two black wires would work if grounded out, however I do know that one of them connects to one of the wires coming from the TPS, and that the other terminates where the yellow and black wires from the fuel injectors terminate. Make sure that there is a clean connection between all the wires, and that each one is properly soldered and heat-shrinked. I've seen a lot of cars run like **** from bad O2 sensor connections, most didn't throw any codes.

 

NEVER SEEN A SINGLE WIRE O2 SENSOR BEFORE

 

I just did this on my car last week. 2 ways. you can either get the wires at the shock tower harness or run the wires behind the ECU. ECU pinout will be given just in case, however i just tapped into them there in the bay

I fit a 93 CX harness on a b18a1 (obd1).
Heres what you do. I hope you have the 4 wire o2 already, it would also help if you had a other side of the o2 plug to retain the adapter. soldering is highly recommended

Step 1:
Solder the White wire on the engine harness to the white wire on the o2.

Pinout: D14

Step 2:
Look for a GRN/WHT Wire on the pass. side harness and tap in there.

Pinout: D22

Step 3:
Look for a ORN/BLK Wire on the pass. side harness and tap in there.

Pinout: A6

Step 4:
With a test light look for a YEL/BLK Wire on the driver side harness. Check for power with the ignition on the on position and ACC. Tap in and solder.

Good Luck and run codes if you get any.

 

in the 91 dx can you wire in a 4 wire the same once you convert to a obd1 computer

 

i believe the obd1 pinouts will be the same location behind the ECU, dont know if it will be at the shock tower harness