How to check car leakage, how to detect car leakage?

The battery leakage we mentioned today can be said to be an extremely normal phenomenon. Of course, the leakage current has a normal range value, if it is exceeded, it will not only affect the normal operation of the on-board electrical appliances, but even start the engine is a problem. So, how to check the leakage of the car battery, today we will tell you the steps to detect the leakage of the car with a multimeter.

Battery leakage detection method:

1. First turn off the ignition of the car, and wait for 5-10 minutes in the locked state, so that the car is in a dormant state.

2. Then find the fastening nut of the negative pole of the battery, unscrew it with a wrench, and then slowly pry open the fastening block with a flathead screwdriver, and then directly pull out the negative electrode joint.

3. Then it is time to go to the detection part of the multimeter, convert the measuring distance of the multimeter to the gear of DC 10A or 20A, connect the red watch pen of the multimeter with the body tie wire, and connect the black watch pen with the negative pole pile head of the battery.

4. Finally, it is enough to directly observe the value of the multimeter, if the value is in the normal range of values, it means that the leakage of the car is normal.

It is worth mentioning that the normal value of car leakage is about 40mA, and it is also possible for some high-end cars to reach 80mA. But if the car leakage is 90mA or even more, it must be abnormal, it is likely to be because of the abnormal leakage of the immobilizer circuit or other circuits, at this time, we need to follow the vine and eliminate them one by one. For example, after pulling out the immobilizer fuse, the leakage value returns to the normal range, which means that the circuit does have a leakage fault and needs to be dealt with in time.

Some cars will not be able to hit the phenomenon after two or three days, to the maintenance station but said that there is a problem with the battery, today I will share with you the detection methods and skills of car leakage, let's take a look!

The method of measuring the dark current of the car is also very simple, it is the same as the current of the circuit measurement, and the basic principle is to connect the ammeter in series between the battery and the car! The multimeter can be selected in the current gear, and the range of 15A can be! Then disconnect any polarity of the battery, and use a black and red pen to connect the battery and the battery wire.

First of all, there will be a momentary larger current, which is the car anti-theft system is working, and then it will slowly decrease, and it will not decrease after stabilizing at a certain value.

At this time, the reading of the ammeter is the amount of dark current, that is, the leakage current. The general value is normal within 30-50mA, and more than 100mA is abnormal.

Inspection method of automobile leakage:

1. Observe the color of the observation hole of the battery, check whether the appearance of the battery is intact and whether there is leakage;

2. Use a multimeter to measure whether the battery voltage and power generation are normal, the normal voltage is above 12 volts, and it is not less than 10 volts after continuous discharge for 10 seconds;

3. Remove the negative terminal wiring of the battery, adjust the multimeter to the current block position, connect the red meter pen to the negative terminal of the battery, and connect the black meter pen to the negative terminal post, observe the value of the ammeter, and compare the measured current value with the maintenance data whether it is within the normal range.

Precautions are as follows.

Turn off all the electrical equipment on the car, the door and trunk are in a locked state, disconnect the negative pole on the battery, and wait for 20 minutes to connect one end of the test light to the negative pole wire of the battery, and the other end to the negative pole post of the battery.

If the light is on, it means that the electrical equipment and lines are still leaking, and the relay and fuse should be checked.

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

Hello, analysis based on your problem description. If there is a leakage of electricity in the car. We need to measure the leakage of the battery with a multimeter current file.

If the leakage current exceeds 0:05 or more. If it's a premium car at 0:

07 or above. Indicate that there is a leakage of electricity in the vehicle. This kind of needs to be overhauled to find the leakage power supply of the vehicle.

The steps to check for vehicle leakage are more cumbersome and more troublesome. Use a multimeter to measure the battery, leakage and leakage current. Then cut off the payment on the car and install the electrical appliances to observe the discharge current of the multimeter.

If the discharge current will be the standard value. That is, there is a discharge of the electrical equipment installed later. If there is still a discharge.

Then you have to cut off the main insurance of the electrical appliances on the car to make a judgment on the location of the leakage.

Set the multimeter to the correct gear. There is a gear for measuring voltage, resistance and current on the multimeter, and the knob should be selected on the measurement current gear to measure the leakage of the car, and then the measuring distance is selected, and the general car is selected to measure the distance of 20A, and then the red pen is inserted into the jack marked 20A.

After the multimeter is adjusted, the car turns off, turns off all electrical equipment, locks the door, then opens the hood, removes the negative pole of the battery, connects the red pen of the multimeter with the iron wire of the body, and connects the black pen with the negative pole of the battery, and observes the current displayed on the multimeter.

Precautions for car leakage.

Nowadays, some mid-to-high-end cars have an audio lock function, so do not easily remove the battery wiring without relevant setting instruments and unlock passwords.

The empirical detection method is not suitable for the inspection of all leakage faults, and can only roughly detect the general leakage faults, so it is best to deal with such faults with the help of instruments and instruments.

Because the automobile circuit is a low-voltage direct current (24V), it is not necessary to use a shake meter to use an ohmmeter to detect whether the gas car circuit is leaking.

1. Discretion:

Check the electrical appliances, navigators, anti-theft devices and other electronic devices in the car that consume power, and confirm that the battery power of these devices is still quickly depleted when they are not used for a long time, then you can be sure that the car is really leaking. At this time, it is necessary to go to the repair shop for professional inspection and maintenance.

2. Professional testing:

1. First of all, we must carefully observe the battery to see if there is leakage, and then use the testing instrument to detect the state of the battery, and also to detect whether the generator power is normal. The sufficient voltage of the normal battery should be above 12V, the density of the electrolyte should be 1, and the liquid level should be in the standard position.

For maintenance-free batteries, a discharge meter can be used to detect, and the voltage measured after continuous discharge of 12V voltage for 10s is not less than 10V. A discharge test can be carried out on a battery that is losing power to determine whether it is good or bad and whether it can be used continuously.

2. Turn off all the electrical equipment on the car, take out the ignition key, disconnect the battery with the anode wire, and connect the DC ammeter between the anode and the battery anode pile head (the maximum range is more than 2A), if there is no ammeter at hand, you can also use the test light of SW instead of the simulation test.

If the ammeter current is below 10-20mA, the test light begins to glow, and then gradually dims, and the filament is dark red or extinguished, it can be inferred that the car loses power. Otherwise, it is regarded as a body leakage fault.

How to detect car leakage? There are two ways to detect whether a car is leaking: one is the current detection method; One is the empirical testing method.

How to detect car leakage? Current detection method: detection steps Disconnect the ignition switch, remove the negative wiring of the battery, and adjust the digital multimeter to the ammeter (1

A), then take two wires, connect one end of the two wires to the positive and negative meter pens of the multimeter, and connect the negative terminal and negative terminal to the other end respectively, and observe the value of the ammeter. Check whether the measured current value is in the maintenance data.

Within normal range. If the measured current value is too large, it means that the vehicle has a leakage fault. Troubleshooting method Unplug the fuse wires one by one and observe the pointer changes. When the pointer no longer rotates when a fuse is removed, the point of fault is the circuit or electrical appliance that passes through the fuse. As with the current detection method, by consulting the circuit diagram or checking the line direction, the damaged parts can be found along the line for repair.

How to detect car leakage? Empirical detection method: detection steps Disconnect the ignition switch, remove the battery negative electrode wiring, and then touch the wiring with the battery negative pole column to observe the spark intensity. The stronger the spark, the more serious the leakage. Troubleshooting method If the spark is weak, it means that there is a small current, and it should be focused on checking whether there is a virtual connection to the indoor small lamp, luggage compartment lamp, etc.; If the spark is strong, it means that there is a large current, and it should be focused on checking whether the electrical appliances are working all the time or whether the circuit is damaged and tie-up.

However, this traditional leakage detection also has certain drawbacks. Because this is not only time-consuming and labor-intensive, but also easy to lose the customer's data (such as clocks and electronic navigation data, etc., which is easy to cause customer dissatisfaction).

Under what circumstances does the backlash cause leakage? According to the professional, the cause of leakage is the aging of the ignition high-voltage line, the loosening of the connections of each part, the short-circuit of the fire wire and the crack of the distributor cover, which flashes from the crack. There are also some car owners to the informal manufacturers to add some electrical appliances, not take the safety line, but directly connected to the car battery, the chassis circuit interface is too much, the possibility of leakage is greater.

Automobile leakage inspection is to find a professional automotive electrician with a special instrument inspection Kunming good hundred years of car supplies reminds you that the car leakage is caused by the long-term use of the car and the aging of electronic appliances is very difficult to check They have a professional car electrician to check the car leakage If you change the battery for a few days, there will be no electricity You can find a professional master to check whether the car has leakage If there is a suggestion to eliminate it in time or this problem will cause the battery to break down quickly Check this kind of problem must have enough time It's not good for a while.

Kunming Good Centennial Castrol Automobile Maintenance StationProfessional technician inspection, car leakage.

Inside, Valta batteries, Yunnan special dealers. tel：

When repairing the car, customers often told us that after two or three days, the power ran out and the car could not start. Some customers' cars leak electricity and can't even open the remote control door, so they can only use a mechanical key to open the door. It can be seen that the leakage of the car has seriously affected the normal use of the car.

So what should you do if you encounter a missing car? How should I check for leaks in my car? What are the detection methods for car leakage?

With these questions, I will give you an explanation below. What is the leakage phenomenon in a car?

Vehicle leakage refers to the phenomenon that the battery is gradually discharged when the vehicle is stopped, which affects the difficulty of starting the vehicle or the abnormal operation of electrical appliances.

There are generally three causes of car leaks:

The first is the loss of battery power caused by the electric switch not turning off when parking.

The second is a short circuit or oxidation of the battery plates, resulting in self-discharge and power loss.

The third category is leakage caused by the grounding of electronic components and circuits such as automotive appliances, wiring harnesses, sensors, controllers, and actuators.

We roughly calculated that to ensure that a fully charged car can start normally after three months of stationary operation, the quiescent current of the whole car must be below 10mA, and the quota allocated to each ECU is about 200UA, so every time we will rack our brains for this small area, such as how big the sampling resistance is, how big the current limiting resistor, how big the leakage current of the pipe, hehe.

If there is a multimeter, I can't. The whole vehicle is ok. If you are testing a single board, you can only use a miniature ammeter or a dedicated DC power tester. h tt ps://2019

There are many ways to check whether the car is leaking, there are mainly the following three methods, and the specific detection steps are as follows:1Current detection method.

1) Disconnect the ignition switch and remove the negative terminal wiring of the battery. (2) Adjust the multimeter to the ammeter (1a), then take two wires, connect one end of the two wires to the positive and negative meter pens of the multimeter respectively, and connect the negative terminal post and negative terminal wiring at the other end respectively, and observe the value of the ammeter. (3) Check whether the measured current value is within the normal range with the maintenance data.

4) If the measured current value is too large, it means that the vehicle has a leakage fault. 2.Resistance detection method.

1) Disconnect the ignition switch and remove the negative terminal wiring of the battery. Using an analog multimeter, the black pen is connected to the positive pole of the battery, and the red pen is connected to the negative level. (2) Adjust the multimeter to the ohm gear (L gear) to measure the total resistance of the whole vehicle.

3) If the meter pointer does not move and the resistance value is very large, it means that it is normal and there is no leakage; If the watch hand is deflected and displayed as a few ohms or more than a dozen ohms, it means that it is abnormal and there is a short circuit. 3.Empirical testing method.

1) Disconnect the ignition switch and remove the negative terminal wiring of the battery. (2) Touch the wiring with the negative pole post of the battery and observe the spark intensity. (3) The stronger the spark, the more serious the leakage.