We are starting a new mini series called Automotive Diagnostic Challenge which will feature a $100 cash prize for the first person to accurately and in detail tell me what the issue is and how this symptom occured. we are starting out with a tough on on a 2009 Ford Crown Victoria Police Interceptor 4.6L. Crank no start. Engine only starts with scan tool connected. The answer needs to contain specifics of how this would be possible and where the issue lies down to circuit numbers, powers or grounds and whats actually happening to make this happen.