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Message:: [QUOTE="Jacobk123, post: 12136690, member: 337172"]Hey all, we've got a 94 freightliner with a 3406e in our fleet towed into the shop with a no start. Story goes, driver was just chuggin along when the truck started to run like a sack of #### before stalling out and not being able to start again. It does crank over. We weren't able to connect our scanner tool. I checked for reference voltage at a few sensors and only had >1v reference. Found the oem plug on the ecm barely Held in and the hold down bolt snapped in half. While one guy held the plug into the ecm socket (40 pin) another cranked her over to no avail. I checked the switched and unswitched powers and ground (load tested), and they all passed. We replaced the ecm with one from a reputable shop who flashed it up to our required parameters. Still no start but now i do have reference voltage.I was able to connect to the ecm with cat et but unfortunately wasnt picking up any codes. After running a few tests i noticed we had no speed on the tach nor was cat et picking up engine speed. I replaced the cam pos sensor  and the crank pos sensor to no avail. Circuits test fine.  No power to injectors while cranking. I know that when you replace an ecm or cam pos sensor you are supposed to calibrate it, but the engine needs to run to do so. Any ideas would be much appreciated. This truck need to get back to work as soon as possible[/QUOTE]