Quote: Originally Posted by covert24  Alright. Now. To test it, you just put the O2 and DME wire together on one lead Of the Multimeter and then the other lead of the M/M on the GND/Negative from the SAP wire and look for .200 volts? Then disconnect SAP +\- and then what should I put the M/M on to see if it's straight through? I'm sorry my brain has been taxed beyond it's limits between trying to figure out this SAP sim and INPA/Ediabas. Mostly INPA.....
Edit: I also forgot to mention how much I appreiate all the help so far from both of you. Also what kind of decoupling capacitor would you recommend me to get and which to components would you put in inline with? Im seriously considering ordering a Pre-printed board if my hack job doesn't work :/ | No to test energize the sim and test the DME wire only to ground. You should have 200mv or around there. When the simulator has no power or is off the O2 and DME wire should be ohm'ed and be a dead short. The reason is to install you cut the O2 signal wire and patch the simulator in. When the Sim is off the O2 signal is sent to the DMEsince the simulator is in pass-though and the O2 signal is sent like the wire was never cut.. When the DME calls for Air Pump the sim goes active and cut the O2 reading and sends a 200mv signal to trick the DME into thinking the air pump is in and working correctly. Hope this clears it up a little | 
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