I am also trying to get the pulse counter to work. When shorted it out by putting a resistor between the Gnd and Aux 5 inputs, it is still registering 150+ pulses per second, without the flow meter even connected.
As far as I can tell we have done everything right and are getting around 150 pulses per second on the engine g software. In another setup it was constantly changing between 60 pulses per second and 100 pulses per second. None of this is correct because the pulse counter we are using is for natural gas and is 1 pulse/cubic foot. We are running air through it which should give us around 1 pulse per second.
Any ideas what might be going on? It seems to be a problem with the ECM 1240.
If you wish to use AUX 5 for pulse counting, you must set the AUX5 option for pulse counting then click the "Reboot" button (all under the ECM-1240 Setup tab). You can cycle the power to the ECM-1240 instead of clicking "Reboot".
If this is not done, any stray noise on the AUX 5 input will be interpreted as AC current and the WS counter will increment at a high rate.