I am having trouble logging my A/F's via PFC/Datalogit. I have troubleshooted the problem all the way back to the voltage across AN1/AN2 via voltmeter. The 5v that is supossed to be present on AN1 goes away when I turn the car on. It goes to 0v, however, I have verified that both the datalogit AND my LC-1 are getting power (both LCD's are on). I can log via laptop A/F's when the car is off, but when I turn it on, the voltage on the datalogit goes to 0V, any ideas?