RB20 ECU no LED??? how do i check codes

[b00stinbmx]

yea so im not too familiar with Nissan Ecus at all. and i think i prob have a o2 sensor issue going on with my rb20. the car is runnign fine but i also want to be able to check my codes. anyway theres a selector screw on my ECU but NO LED inside the peep hole there. my car is a 1990 so therefore i guess there is no Check engine light on the dash as well. can anyone shed some light on what i need to rig up to make this work. i searched around but either wasn;t looking in the right spot or this hasn;t been covered yet. thanks!

[Fibre guy]

Did you try a nissan consult?You can wire your old 14 pin consult plug into your rb20 ecu. Just do a search.The wire from a computer to the plug is about $40-$100 and the software to use it is free if you look in the right places.I wired mine up in about 10 mins. Very useful and prevents lots of head scratching.