Symptom: the engine running suddenly turn off, no longer start.
    Troubleshooting: start the engine several times, are unable to drive, but the exhaust pipe exhaust gas smell, indicating that the cylinder fuel supply. Check the ignition conditions of each cylinder, spark plug fire intensity meet the standard. Check the valve timing and cylinder pressure, have reached the requirements. Connect V.1.G1552 into the engine electronic control system, query fault storage, there are three fault information is recorded, the contents are: ①180911683035 / 18091reference. ② camshaft signal control device mechanical failure. ③ Hall signal generator to ground short circuit. As the 18091168303518091reference information can not query, so according to the last two fault information, open the engine compartment cover, dismantling the Hall sensor signal generator, found that the front of the camshaft pulse ring off, the positioning side has been damaged. Re-replaced a new pulse ring, the engine started smoothly, the fault can be ruled out.
    This fault description, the engine ignition sequence control, is subject to the engine speed sensor and Hall sensor dual role. The Hall sensor provides the upper and lower cylinder signals of the engine 1, 4 cylinder. The confusion and loss of this information directly led to the engine can not start.