When the electric switch is turned off, the battery is out of charge, etc.; the battery plate is short-circuited or oxidized and falls off, resulting in self-discharge and loss of electricity; due to leakage of electricity caused by electronic components and circuits of automobile electrical appliances, wiring harnesses, sensors, controllers, actuators, etc. Loss of electricity. It will cause the car to start difficult or the electrical work is not good. There are many ways to detect whether a vehicle is leaking, and it can be roughly divided into the following types.
1) Current detection method
In the detection step, disconnect the ignition switch, remove the battery negative wiring, adjust the multimeter to the ammeter (1A file), and then take two wires, connect one end of the two wires to the positive and negative test leads, and the other end to the negative terminal and Negative wiring, observe the ammeter value. The measured current value is compared with the maintenance data in the normal range. If the measured current value is too large, the vehicle has a leakage fault. Troubleshooting Method Remove the fuses one by one and check that the value changes to -tg. When the current value becomes smaller when a fuse is removed, the leakage portion is a circuit or an electric device that passes through the fuse. After determining the fault range. You can look at the circuit diagram or look at the line. Find the damaged part on the line and repair it. If all the fuses are removed, the ammeter value is still very large, indicating that the fault point is on the line before the fuse, and it should be focused on whether the line before the fuse is short-circuited.
2) Resistance detection method
In the detection step, disconnect the ignition switch and remove the battery negative wiring. Using a pointer multimeter, the black pen is connected to the battery positive pole. The red pen is grounded. Adjust it to the ohm file (Qxl file) to measure the total resistance of the whole car: if the watch pointer does not move, the resistance value is large, it means normal, no leakage phenomenon; if the table pointer is deflected, it is displayed as a few ohms or a dozen ohm. It means that it is not normal and there is a short circuit. Troubleshooting Method Remove the fuses one by one and observe the pointer changes. When the fuse is no longer rotated when a fuse is removed, the fault point is the circuit or appliance through which the fuse is passed. Same current detection method ~ sample. Look through the circuit diagram or look at the route, and find the damaged part along the line for repair.
3) Empirical testing
In the detection step, turn off the ignition switch, remove the battery negative wiring, and then touch the wiring to the battery negative column to observe the spark strength. The stronger the spark, the more serious the leakage phenomenon. If the spark is weak, it means that there is a small current. It should be checked whether there is a bright connection in the indoor small lamp and the luggage compartment lamp. If the spark is strong, it indicates that there is a large current. Useful electrical appliances are always working or the line is damaged or grounded.
Let's take a look at how to use a multimeter to detect car leakage.
2. How to measure car leakage?Frequently encountered customers reflect that the car has no electricity after two or three days of parking, and can not start the car. Some even the remote control door can not be opened, only the mechanical key can be used to open the door. Going to the repair station to overhaul said that the battery is no problem, because the car has leakage, it can not be beaten, many car owners do not know how the leakage is going on, the following small series talk about how to measure the car leakage?
Choose the correct gear. There are gears for measuring voltage, resistance and current on the multimeter. When measuring the leakage of the car, the watch must be selected in the measuring current file. Now the car is DC, so it is finally in the DC current gear.
Select the range. When measuring current, choose the gear range from large to small. If the range is too small, the multimeter will burn out. Therefore, choose the appropriate range from large to small. The range of the general car is 10A. Now there are many tables. The range size is automatically adjusted as long as the gear position is selected correctly.
Open the cover to measure the leaking vehicle, turn off all the electrical equipment on the vehicle, and then lock the door. If there is a remote control vehicle, lock the car with the remote control.
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