evoplatypus Posted February 5, 2013 Report Share Posted February 5, 2013 I have a question about the V44 plugin for lancer evo 8. How exactly is it getting power? On the original evo 8 4 plug wire loom pin 12 and 25 are 12V switched power thru main relay (so they are not the power supply for the ECU), pin 38 which is the MFI relay is Inj 8 used for ECU hold power, pin 82 is Ignition which is DI1 on the vipec (or is it also the power supply???), pin 80 is 12V constant but from what I checked it is not used in any way to power the ECU. Please help me out with this. I'm trying to figure out the best way to power the V88 in my evo 8 and the info on V44 which I have in my car right now would help with that. I have my adaper/loom from the original 4 plug to V88 vipec plugs ready except for the power +14V wires. Quote Link to comment Share on other sites More sharing options...
Simon Posted February 7, 2013 Report Share Posted February 7, 2013 On the plugin pin 82 sees 12V and in turn activates a ground to pin 38 Via a transistor. The ECU then powers up off pins 12 and 25 Quote Link to comment Share on other sites More sharing options...
evoplatypus Posted February 7, 2013 Author Report Share Posted February 7, 2013 That is what I was thinking but when I disconnected pin 12 and 25 from the ecu the car started normally and the ecu was still getting power. Was it thru pin 82, even that pins 12 and 25 were not connected to ecu? Quote Link to comment Share on other sites More sharing options...
Simon Posted February 7, 2013 Report Share Posted February 7, 2013 On factory ECU or ours? If on ours this could be due to back feeding. In some cases if an output device gets power it can feed back to the ECU and cause it to stay powered up. Quote Link to comment Share on other sites More sharing options...
evoplatypus Posted February 7, 2013 Author Report Share Posted February 7, 2013 On factory ECU or ours? If on ours this could be due to back feeding. In some cases if an output device gets power it can feed back to the ECU and cause it to stay powered up. On the V44 plugin. Thanks for the explanation. Quote Link to comment Share on other sites More sharing options...
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