Ok, I have a 1990 honda prelude. I just installed my s-afc, and I am almost 100% posotive that everything is hooked up correctly. But here is my problem: The ground wire that goes to the ECU is grounding when the key is off, but as soon as I turn the key to the on position, their is no longer a ground. I tested the wires to find this out. Anyone hava any idea why their would not be ground when the key is on? Oh, I forgot to mention, the engine is not in the car right now, could have an effecting on the ground in the ECU? Please help me out. Thank you.

 

the transmission ground grounds the ecu.

 

Really? My tranny ground just goes from the tranny, to a chasie ground. Do you think thats my problem? Thanks for your help.

 

yep, i would say so.
remember that the sensor grounds go from the ecu, to the engine harness, then to
the engine/trans and then to the chassis.

 

Sounds good to me man, thanks a ton for your help, now I can sleep tonight. Thanks again.