Quote:
Originally Posted by TimFreeh
In regards to the above wiring diagram for replace air injection system wiring keep in mind the stock ECU is going to be looking for a specific resistance to ground through the clutch windings. When power is applied I'm also guessing the ECU will monitor current draw so whatever solution you're going to use will (I think) also require you to mount the original compressor clutch somewhere in the engine bay to operate as a phantom load to fool the ECU into thinking its still operating a stock system. Maybe you could zip-tie the compressor to the air cleaner or something?
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I am not so sure the ecu is this discerning. In my experience it is really just looking for open/short. You are right though on some motors the computers check for ohms to ground after they shut off. Like the ABS/ASR pump is later years. But they switch power and monitor through the relay. The supercharger clutch is supplied with 12vlts fused and then ecu controls ground directly.
It might overload the ecu's driver to run an electric air pump though.
I can tell you that the air pump would not last very long as it would be running all the time as the computer would think that it is the supercharger clutch and it is applied a little more than just for secondary air injection.
I still say put in a non kompressor ecu. It solves all of these problems. It would cost about what ever a used ecu costs from a salvage yard and around 2-300 to have it unlocked and then just another hundred or so to have someone with a star machine marry it to your car. Or just sell the car and buy a non kompressor car.