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Note ! This 'so called' CAM reference sensor is inductive coupled to cylinder 6 ignition wire (from distributor) ie. signal gets generated when cylinder 6 spark is fired. |
This is interesting question - since in schematic (E30 -89, with M20B25 engine) it seems that tachometer is wired directly from Motronic ecu (engine speed output from Motronic ECU connector pin 6, black wire to instrument cluster pin 7). |
Original (Motronic) injection setup is batch firing (in two batches of three injectors simultaneosly). |