The ignition system common fault analysis

by:Haiyan     2020-04-28
What circumstances a failure vehicle ignition system the following situation occurs, is likely to be ignition system failure: start the main show is started when difficulties, idle speed is normal, normal neutral oil, started the car, occasionally uphill launch vehicles easy to stall. Main engine fire engine fire to vehicles in idle speed and low speed smooth, high-speed car to run after a period of time started to wobble engine vehicles jitter mainly for vehicle parking will appear at the traffic lights. Improve the engine speed and steady operation. The main engine speed to cold start is difficult, after start engine idle dithering, accelerate the weakness, oil consumption increased significantly. The main engine won't start starts up, turn to start the machine, but the engine won't start. Vehicle when sending through automatic transmission shift quality is normal, no shift impact phenomenon, but rise to block some earlier than normal car, new car jitter feelings are small amplitude, and persistent, the speed of 40 km/h when began to rush car phenomenon, the speed of 60 km/h when the car is the most obvious. Engine speed weak sometimes sometimes will automatically shut down the main performance for low speed ( 40~60km/h) Driving the engine to accelerate weak sometimes, and sometimes will automatically shut down. In the process of high speed and without exception. Fault occurs, the engine acceleration is weak, and be stalling. Idling engine throttle down in the process of driving, and fault indicator light shine. Main show is urgent to accelerate the engine came first shiver, setbacks, and vehicle is followed by the engine flameout, observation instrument that failure indicator light. Start the engine can't a car. But stalled restart still can the car. Suddenly can not start the main engine performance in the process of slow down the dashboard warning lamp suddenly all, vehicle flameout, restart the engine, didn't response at all ignition system common fault analysis: 1. Proficient in ignition system operation is the spark plug the individual cylinder misfire diagnosis or high tension line ( Cylinder wire) The corresponding fire cylinder. An electronic ignition system is the major cause of the fire spark plugs, high tension line and ignition coil failure. Other reasons can cause engine misfire, specific as follows. A, the ignition system fault lead to fire the main reasons are defiled, spark plug electrode gap is too big or too small, poor insulation, high tension line break open circuit or short circuit, ignition, ignition coil corresponding part of the electronic control components, electronic controller failure or corresponding ignition signal control circuit connection etc. B, fuel supply system failure led to fire the main reason for blockages in the air filter, intake pipe leakage, poor failure of fuel pump, fuel filter, fuel oil or oil pressure too high or too low, fuel injector failure, etc. C, main failure valve-train fire is caused by the improper valve clearance adjustment, with gas phase is wrong, three yuan catalysts congestion jams, muffler, etc. D, cylinder seal bad fire, as a result of fire electronic control part mainly sensor fault, such as rotating speed sensor and the inlet pressure sensor or air flow sensor, etc. 2. The crankshaft position sensor fault, a crankshaft position sensor ( Engine speed sensor) Structure principle > > after the engine rotor end of the crankshaft position sensor signal for tooth disc, number of teeth for 60 2 teeth, that is, in the original for circumferential 60 teeth, cut off two teeth, forming on the circumference of a circle evenly spaced 58 convex, 57 small tooth missing and 1 big teeth missing. Installed in the front-end engine crankshaft position sensor camry using magnetic induction crankshaft position sensor installed on the crankshaft timing cover, crankshaft timing of the rotor is composed of 34 teeth, with two teeth missing. Every 10 ° output crankshaft crankshaft position sensor signal, the tooth is used to determine the check point. B, crankshaft position sensor detection > > jetta sedan induction G28 crankshaft position sensor is installed in the engine of the back-end near the flywheel, and screw on the engine cylinder block. Enhanced skills: signal to determine when the crankshaft position sensor failure, will lead to interrupt signal, engine can't start or shut down immediately at runtime, the ECU can diagnosis to fault and fault code storage. Clearance between the signal plate and the crankshaft position sensor head in 1. 5 mm is more appropriate. Jetta sedan crankshaft position sensor output waveform figure as follows. 3. The camshaft position sensor fault engine control module receives the signals used for synchronization pulse, trigger the fuel injector in proper order. Engine control module USES the camshaft position sensor signal indicates the position 1 cylinder piston during the power stroke. Engine control module which can calculate the actual fuel injection sequence. If the camshaft position sensor signal loss during engine operation, fuel injection system will be converted to calculate according to the last fuel injection pulse sequence of fuel injection mode, and the engine will continue to run. Even if the fault is, the engine can be restarted. Enhanced skills: the camshaft position sensor fault camshaft position sensor G40 of short circuit, open circuit or short circuit to the positive, fault code 00515. Measure G40 lines, such as defective to rule out, check the cog belt of timing is correct. If the timing is no problem, then determine the sensor itself is damaged. Crankshaft position sensor and the relationship between the camshaft position sensor, crankshaft position sensor is a determination of engine speed and the crank Angle of accurate location of the inductosyn. According to the crankshaft position cannot be aware of a cylinder compression stage or ventilation phase information. Only clearly identify which cylinder squarely in the compression stroke, to produce the first spark ignition. Hall sensor ( The camshaft position sensor) The determination of the camshaft and crankshaft position sensor to identify the first check point on the cylinder of the ignition. By comparing the crankshaft sensor and the camshaft sensor signal is used to identify the cylinder. 4. Knock knock sensor is a kind of vibration acceleration sensor, produce a mechanical vibration and engine corresponding output voltage. The sensor is installed in the engine cylinder body are sensitive parts. If the engine detonation, the ECM/ECU will receive the signal, filter without knock signal calculated, and through the camshaft and crankshaft position sensor signal to determine the engine's position in the work cycle, the ECM/ECU according to the calculated what a crock of detonation occurs, will reduce the ignition advance Angle of the cylinder disappear until the detonation phenomenon. Then increase the ignition advance Angle again until the ignition advance Angle in the condition of the best location. Enhanced skills: knock sensor fault when detonation cannot provide knock signal before going to happen, the ECM/you can't get a signal 'peak', ECU can't reduce the ignition advance Angle, and detonation.
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