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A Fukuda car with a mileage of about 130 thousand km. User response: after the vehicle is running normally, the fire is stopped for about 10min, and it starts again. The engine has no signs of starting. Troubleshooting: the starter is working normally, but it can't get the car, and the engine has no signs of starting. Because the engine failure lamp is not light, it is not necessary to read the trouble code first. When the car is towed to the repair plant, the basic inspection is carried out first, the insurance and the relay are normal, the oil road is normal (the resistance of the crankshaft position sensor and the output signal are normal), the cylinder pressure is normal, the pressure is normal, the high pressure is found without fire, and the ignition coil has been found that the head (three line) of the ignition coil is loose and is obviously in bad contact; the engine is restored after the engine. There is still no sign of starting. Check the ignition coil input voltage normal (12V), but there is no output signal, so the fault point can basically be judged as the ignition coil problem, the ignition coil and the ECU connection wire harness problem (iron, circuit breaker or bad contact), ECU problem. Check the wiring harness of ignition coil and engine computer, the result is normal; replace the new ignition coil fault is still, so the fault point is identified as ECU abnormal work. So after changing ECU, the engine is started, the result is normal starting, idle speed is steady, and acceleration is strong, all work is normal. Troubleshooting. Failure analysis: can cause the engine can not start a lot of reasons, but in the normal running process of the vehicle to fire a moment after the problem, first know that there is enough fuel, after the fuel pump failure to check the insurance, relay, plug is not loose, and so on, and then check the circuit or electronic components of the work. Then check the timing (timing belt trip) correctly. If necessary, read the fault code and analyze the cause of the fault. We should follow the inspection principles from outside to inside, from simple to complex.