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Summary of change:
See * MembersPage/SFiftyBthirtyTwoVanos * InputTrigger/BmwDoubleVanos '''Normally variable timing (VVTI or Vanos) solenoids''' are powered by constant +12V on one pin and '''controlled by low-side outputs''' as sane engineering practice applied generally. (For example BMW M50 Vanos is sane). In VEMS ECUs '''there are plenty N-FET type low-side driver outputs anyway''', eg. free injector output or IGBT ignoutput, the ECU switches GND as usual), so the extra NFET-outputs are optional (useful if 8 cylinders consume many outputs, or other special relays or actuators are planned to be connected). ---- '''Some Vanos solenoids require Hi-side PFET outputs''' * '''Hi-side PFET outputs: 2 or 4''' If the Vanos solenoid is driven by high-side output * if the ECU switched +12V (perhaps the BMW engineers lost their medicines those days), * and accordingly: the direction of flyback diode molded in the VANOS solenoid connector is connected with common anode to GND * which is not easily changed; measure this diode to verify the drive polarity * such as most S54B32 (iirc S50 also), '''then Hi-side P-FET outputs are recommended.''' So please check the Vanos solenoids and measure diode polarity (and determine power direction) * and never forget to mention the exact engine model. BMW usually requires 2 outputs per Vanos solenoid. See [https://vems.hu/vt/help/v3/v3_camshaft_angle_control.html camshaft angle control in VemsTune help]
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