ISIS Intelligent Multiplex System

[James OLC]

Originally Posted by deuce_454

THAT is a nice feature..
i have a question, if th eengine has dual fan controll built in to the ecu... do i connect the fan enable (wich is pull to ground) to the ISIS and program 2 outputs, one for each of the fan motors?

That is the way that I wired mine. You don't neccessarily have too but the biggest benefit of running it through the ISIS MasterCell is that you can add additional triggers/controls for each fan. For instance, you can have each fan temperature controlled by the ECU, then you could have a second trigger for the second fan running from the AC and you could have a second trigger for the first fan as a manual switch in case you want to override the ECU or run the fan when the car is off. Likewise, you could add an override switch to shut the fan off regardless of what the ECU is telling you - for instance if you are racing the car (and don't want the draw) or if you want to control/override the fan based on speed or RPM.

The great flexibility that ISIS gives you is that you can have IF - THEN programming regardless of what the base system wants to do. For instance, most of the new OEM cars shut the electic fan off over 35 mph (or something) since the electric fan isn't doing anything useful at speed anyways. You can, with a little bit of thought, program your EFI engined swapped or even carbed setup to do the same.