Scott33 Posted April 18, 2020 Report Share Posted April 18, 2020 In order to make sure the AEM UEGO controller is only running when the engine is running, one normally wires the power to the UEGO controller with a relay, which is controlled by an aux output of the ECU. However, the current requirements of the controller are pretty low - 1.2A. Instead, can we just wire the ground of the controller directly to the aux output of the ECU? Controller power will have to be switched so that it is not on when the ECU is off (otherwise ECU could receive phantom power). Also I would use CAN to communicate, not analog, in order to avoid the slight ground shift between the controller and ECU. To reduce the load on the aux outputs, the controller ground could be split between two aux outputs that are configured the exact same way. Not only would that divide the heat between two mosfets, but would actually cut the total heat in half (P=I^2*R - half current in each mosfet means a quarter of the heat per mosfet, 1/4 * 2 = 1/2). Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 19, 2020 Report Share Posted April 19, 2020 It should be ok, the aux drives are good for about 2A. I would not parallel 2 auxes as that could mess with some of the overcurrent safety and diagnostics of the chipset. Quote Link to comment Share on other sites More sharing options...
dx4picco Posted April 19, 2020 Report Share Posted April 19, 2020 Is that also thinkable with a X series Wb from AEM? They tell to put a 5A fuse in line but I assume real consumption would be lower? Quote Link to comment Share on other sites More sharing options...
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