Working on a F250 trying to locate a problem in the wiring from the distributor to the injectors. Have replaced the ECM, the distributor (the TF module), the throttle positioning sensor. When cranking engine, there is no injector signal. Can spray gas into intake, start engine, snap throttle and produce injector signal that way. Need more detailed wiring schematic and/or more info on electrical path for the signal in crank mode.[/align]