Synchronous capture of Crank Sensor (Blue) vs. Cam Sensor (Red) . Analysis: The PDF shows perfect crank sine waves, but the cam sensor waveform is stuck at a flat 0 volts. Diagnosis: The PDF confirms a dead cam sensor (Hall effect, no power or ground). Because the engine uses "GDI synchronous injection," without the cam signal, the ECU never fires the injectors. The PDF printout guides the mechanic to test the 5V reference pin first.