Okay, I just swapped in a 99GSR using an 99si Harness and an Si ecu into a 99DX hatch. Everything seems to be fine cept for the CEL being on because the secondary O2 sensor is not wired in. Anyone know where I can get info on wiring the secondary 02 in? I looked for the plug on the wiring harness but the Si main engine harness, unlike my stock DX one, doesnt have a plug or wiring for the 2nd O2 sensor.

 

In the service manual, the SI has the secondary O2 sensor running down through the floor board up by the dash. Its attached to the main harness that runs behind the dash on the firewall. I also see where yours was attached to the engine wiring harness. I'm about to go to bed...i will see if i can find the pin outs for the SI ecu then you can just run wires to the ECU from your secondary O2 sensor.


-Ace

 

get an obd I gsr ecu...