Car circuit failure, sometimes smoke, sparks, abnormal sound, smelling odors, heat and other anomalies. These phenomena can be directly observed, which can determine where the fault location.
2, open circuit method
automotive circuit equipment grounding occurs (short circuit) fault, open circuit method can be used to judge the upcoming Ground Fault Circuit suspected broken section, observe whether the electrical equipment in the Ground Fault there, in order to determine the circuit Ground the site and why.
3, short circuit
automotive circuit breaker failure occurs, you can also use the short method to determine that the use of screwdriver or wire to a circuit fault is suspected of shorting the circuit, observe the meter pointer changes or working condition of electrical equipment to determine the existence of this circuit open fault.
4, test lamp method
; test method is to use a light bulb as a test vehicle lights, checking whether the circuit breaker failure.
5, instrumentation method
Observation car dashboard ammeter, water temperature, fuel gauge, oil pressure gauges and other instructions, judging whether the circuit failure. For example, the engine cold, turn the ignition switch, the water table indicates the fixed position of full scale, indicating that water temperature sensor failure or a ground connection of the line.
6, low
Ground Fire Test Remove the electrical equipment that is a thread on the metal parts of cars (Ground) touch test to determine the cause sparks. This method is relatively simple, the vast number of methods commonly used automotive electrician, Ground fire test method can be divided into direct and indirect Ground Ground Two. The so-called direct grounding, the load is directly Ground has not been a strong spark. For example, we have to determine the ignition coil to the battery section of the circuit is faulty, you can remove the ignition coil connected to the ignition switch of the thread, in the car body or chassis Scratches, if there is a strong spark, indicating that the circuit is normal; if no produce sparks, indicating that the section of the circuit breaker occurred. Ground indirectly by a vehicle electrical load and a weak spark Ground to determine whether the defective circuit or load. For example, the traditional electrical wires off the ignition grounding system (circuit through the ignition coil primary winding), if there is spark, indicating that this line is normal; if no spark, then the circuit breaker. Of particular note is that the fire test method can not be applied in electronic circuit car.
7, high-pressure fire test method
Ground testing of high voltage circuit for the fire, observe the EDM conditions, determine the ignition system work. The specific method is: Remove the high voltage ignition coil or spark plug wires, spark plugs or cylinder head of its aim and so on, a distance of about 5mm, then connect the starter switch, turn the engine, to see the flash over the situation. If the spark strong, was sky blue, and the arcing sound great, then the ignition system was basically normal; the contrary, then the ignition system is not working properly.
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