HI, have a problem with the LPG system in my Mk6 Transit. The symptom is severe misfiring, which I think is due to a fault in the distributor. Before shelling out for a mid-boggingly expensive replacement unit, I would like to test the electrical parts ,ie the stepper motor which is bolted to the top of the unit. This has 4 connection pins, but I have no idea which pin connects to where. The DCSO valve on the unit has 2 pins, so it was a simple matter to test that by connecting to 12 volts to see that it was operating, but the stepper motor has 4 connections. I assume 2 of these are the earth and the 12 volt supply (when triggered by the ECU) but what are the other two? And how can I check that it is working correctly?
If anyone has or knows of a wiring diagram that would be brilliant.
Thanks in advance for any advice.