bmw329 Posted March 27, 2013 Report Share Posted March 27, 2013 I was review the BMW M50TUB25 factory wiring diagrams and noticed that the stock ECU has eight grounds: 15 - ground 28 - ground for electronics and shielding of sensors 34 - ground remaining output stages 40 - O2 signal ground 45 - shield ground 55 - ignition ground 71 - knock ground 44 - sensor ground The pinouts for the PNP only has pin 34 grounded. I am wondering how the sensors are being grounded. For example, I expect my O2 sensor signal to ground to pin 40 but it doesn't seem be connected to anything according to the PNP pinouts. Is this just an omission in the VTS help pages or is the PNP routing grounds to pin 34? If it isn't, what should I be grounding my sensors to? I see the V88 has a dedicated sensor ground but the PNP doesn't have one in the pinouts. Quote Link to comment Share on other sites More sharing options...
Simon Posted April 2, 2013 Report Share Posted April 2, 2013 The plugin has all grounds as per factory wiring. Quote Link to comment Share on other sites More sharing options...
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