George GEP Posted November 7, 2017 Report Share Posted November 7, 2017 OK so i have such issue with mostly all bmws when i wire Vanos solenoid to ECU does not matter is it single vanos, double vanos M54 or S54 there is same issue to not make things complicated lets talk about M52 vanos solenoid that has just switched +12v through relay and ground control when i use OEM wiring and leave +12v feed from injector relay, i can not turn ignition off when solenoid is connected to ecu, it back feeds everything if i start engine, turn ignition off, engine is still running and meanwhile if i disconnect vanos solenoid it will shut everything off (as it should when ignition is off) i'm talking about E36, E34, E46, E39 cars it is not car / chassis specific it is wiring related. i wired relay for vanos solenoid separately which does feed solenoid separately and relay activated by injector power relay. but still does same thing it leaves ignition ON (but not always) i put diode on power wire between vanos and relay.. worked for day and then it did same thing and now it does always - leave ignition on how do u guys solve this issue? used exactly those methods of wiring as well - no luck Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted November 7, 2017 Report Share Posted November 7, 2017 Sounds as if the coil circuit has a constant +12v feed and not a switched feed. Quote Link to comment Share on other sites More sharing options...
George GEP Posted November 7, 2017 Author Report Share Posted November 7, 2017 6 hours ago, Brad Burnett said: Sounds as if the coil circuit has a constant +12v feed and not a switched feed. no sir, i wired through relay that comes on and off with injectors relay (so that positive power source for relay power feed is not constant but switched)... but does not come off when vanos solenoid is connected. Quote Link to comment Share on other sites More sharing options...
Simon Posted November 7, 2017 Report Share Posted November 7, 2017 If you head to the PC link help file Navigation: G4+ ECU Tuning Functions > Auxiliary Outputs > Wiring Auxiliary Outputs Then click on the Avoiding aux back feeding link at the top it will give you a full explanation of what is happening Quote Link to comment Share on other sites More sharing options...
George GEP Posted November 7, 2017 Author Report Share Posted November 7, 2017 i have checked and YES wiring is done this way Quote Link to comment Share on other sites More sharing options...
Simon Posted November 7, 2017 Report Share Posted November 7, 2017 Something is keeping power when the key goes off otherwise it would shut down. Are you sure the Relay switching coil is not hot fed? Quote Link to comment Share on other sites More sharing options...
integrale8v Posted November 8, 2017 Report Share Posted November 8, 2017 Stock BMW dme (Main engine) relay are hot powerd on relay coil. Quote Link to comment Share on other sites More sharing options...
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