Ok swapped a d15b into my 89 crx si. Changed to the correct P08 ecu. Now before with the stock motor and ecu the check engine light would come on after the car was hot and youd get on it. Well i drove the car with the swap for about 30 miles id say got on it and it came on again. It goes off after the cars turned off but as soon as you get on it the light comes back on. Before with the stock setup i thought it was an O2 sensor but now it has different O2 engine and ECU but seems to be the same problem. Car runs fine vtec still works doesnt seem to be any power loss. Anyone PLEASE???

 

what code is it throwing?

 

i dont know what code since i converted to OBD-1 i no longer have the ECU with the light in it. how do i check to see which code im throwing with OBD-1?

 

Ground the wire coming off of D4 on the ecu. It will make the CEL flash the number of the code(s) you're throwing.

It's best to hook up to a toggle switch so you dont have to manually ground it all the time.

 

So ok i find the D4 pinout on the ecu connect one wire running from it to the toggle switch and the second wire off the toggle switch to a good ground and it when switched it will display the flashes on the check engine light on my dash?

 

How do i identify the D4 pinout?