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Summary of change:
This Mitsubishi has a HALL trigger on the camsync. unfortunately * resolution is trash (due to cambelt sloppyness) * period is same as if it was on crank (less information than normal cam signal: not enough for fully sequential, but enough for wasted spark) The trigger is Coil type (one pulse per event ), but alternating positive and negative to distinguish 1-4 and 2-3 cylinders (are you sure?). Every spark belongs to a step on the figure below. DC: ~2.5V, amplitude: ~2.5V. Somewhere we apparently have a '''a series capacitor''' (input highpass filter !!! ) that causes the very characteristic sharktooth signal. * maybe in the notebook: I recorded the trigger signal with a notebook http://www.bormodell.hu/IgnitionTrigger.png The signal is currently processed with LM1815 and series condenser so it is theoretically universal considering trigger type (hall and VR). In 50% of cases, LCD displays right value, otherwise rough half of proper RPM. if we reconstruct the original signal, we can see that * pulse for cyl1,4 has a longer width * pulse for cyl2,3 has a shorter width (or the other way around) Find the correct cyl: * camsync * using bothedge (no LM1815) and consider signal length (firmware modification) Any ideas, how to condition the signal? * try swapping the 10k pullup inside v3.x : '''use an 1M''' or even higher (eg. 1.5M) '''pulldown'''. The series cap will drop voltage very slowly with that value. ---- Check bottom of DocsPage to upload files to wiki.
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