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Seven major methods to eliminate circuit failure

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Common faults in truck circuits mainly include: open circuit, short circuit, damage to electrical equipment. In order to diagnose faults quickly and accurately, several common troubleshooting methods are described below.


1. Intuitive diagnosis method: When the automobile circuit fails, there are occasional abnormal phenomena such as smoke, sparks, abnormal noise, burnt smell and heat. These phenomena can be directly observed, so that the location of the fault can be determined.


2. Open circuit method: When the ground fault occurs in the automotive circuit equipment, it can be judged by the open circuit method. After the circuit segment suspected of having the ground fault is disconnected, observe whether the ground fault in the electrical equipment still exists, so as to judge the circuit grounding. The location and reason.


3. Short-circuit method: An open circuit fault occurs in the automobile circuit. It can also be judged by the short-circuit method. That is, the circuit that is suspected of having an open circuit fault is short-circuited with a screwdriver or a wire, and the change of the instrument pointer or the working condition of the electrical equipment is observed, thereby judging the circuit. Is there an open circuit fault?


4, test light method: test light method is to use a car light bulb as a test light, check the circuit for open circuit failure.


5. Instrument method: Observe the indications of the current meter, water temperature meter, fuel gauge, oil pressure gauge, etc. on the dashboard of the car to judge whether there is any fault in the circuit. For example, if the engine is cold, when the ignition switch is turned on, the water temperature gauge indicates that the full scale position is not moving, indicating that the water temperature sensor is faulty or that the line has ground.


6, low-voltage ground test fire method: that is, remove a certain line of electrical equipment to the metal part of the car to try and spark to judge. This method is relatively simple, and is a method frequently used by automobile electricians. The ground test method can be divided into direct grounding and indirect grounding. The so-called direct grounding is a strong spark generated by direct grounding without load. For example, if we want to judge whether the ignition coil to the battery has a fault, please remove the wire connecting the ignition switch on the ignition coil and scratch it on the car body or the frame. If there is a strong spark, the circuit is normal; if not The spark is generated, indicating that the circuit has an open circuit. Indirect grounding is the use of a certain load on a car's electrical appliance to create a weak spark to determine if the line or load is faulty. For example, if the conventional ignition system is connected to the grounding wire, if there is a spark, the line is normal; if there is no spark, the circuit has an open circuit. It is particularly noteworthy that the fire test method cannot be applied to electronic circuit vehicles.


7. High-pressure test method: Perform a ground test on the high-voltage circuit, observe the spark condition, and judge the working condition of the ignition system. The specific method is: remove the high-voltage wire of the ignition coil or spark plug, align it with the spark plug or cylinder head, etc., the distance is about 5mm, then turn on the start switch, turn the engine to see the fire. If the spark is strong, it is sky blue, and the slamming sound is louder, it indicates that the ignition system is basically normal; otherwise, the ignition system is not working properly.


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