I recently put a GSR swap in my sedan and im having problems retrieving codes from the ecu. I spliced in the obd1 grey plug into my stock harness. I'm getting a check engine light now and are trying to retrieve the codes but when i ground out my service check connector wire it does nothing. i checked it for voltage and it has 5 volts thats the correct voltage it suppose to have. Another problem is that since i cant retrieve codes i cant figure out my other problems. It doesnt rev past 3000 rpm.

 

try checking to see if your tps sensor sensor is in its right spot..the two outer wire...how i figure out my check engine light problem was..i was able to get my friend that tune my car to plug up my ecu with a data log on it to his laptop and found the problem

 

Sounds like incorrect Distributor Wiring. I dont mean Firing order. Actual Wiring.
Did you wire it yourself?

 

yes i wired it up my self.