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what circuit are you using zexel? and are you sure to restart consult software once engine is started (as connection might be loss due to cranking drop in volts)
as ive told the original poster via email a few days ago, its most likely the ECU transmit in the circuit (top part with R1), if you dont use a schmitt triggar input like HC14 to output a 0-5v square wave (since using just a resistor ends up with a more rounded wave, and closer to 1-5v), then use a single R1 10-15K and remove R2.
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