There are many fault points that can cause the car to fail to start, and if you want to judge whether it is the starter or the battery fault in many fault points, you need to set a big premise, that is, "the rest of the fault points about the car can not start have been eliminated, only the starter and battery have not been ruled out." Otherwise, it is easy to lead to a cognitive misunderstanding among most riders: that is, there are only two reasons why the car cannot start, in addition to the starter is the battery. The reason for setting such a premise is to narrow the scope of the fault and reduce the workload of discussing the problem; the other is to allow riders to avoid cognitive misunderstandings and reduce the troubles of daily use of cars.
How to determine that the battery failure caused the failure to start?
When the car cannot start, if there is a problem with the battery, then the vehicle will have the following fault phenomena:
1. Turn on the ignition switch, the instrument is not bright (if the light is also very dark, or the backlight flashes);
2. When starting the vehicle, the starter does not sound (if the sound is also weak, or clicking, nourishing the sound);
3. Press the horn and do not sound (if the sound is also hoarse, weak);
4. Turn on the vehicle lights are not bright (if the light is also relatively dark);
5. The moment the vehicle is started, the driving instrument black screen, multimedia black screen;
6. When the ignition switch is turned on, the battery warning light on the driving instrument is always on;
7. The whole car has no electricity.
The above seven fault phenomena are caused by the shortening or damage of the battery life, if the vehicle can not start and accompanied by one of the above seven phenomena, then it can be basically judged that the battery damage is caused. The emergency solution is: power up!
The above seven ways are to judge whether the battery has a problem through the fault phenomenon, that is, from the perspective of Volkswagen riders, and then you can also talk to you about how to judge whether the battery is faulty from a professional point of view, that is, from the perspective of detection.
1. Use a multimeter to measure the battery voltage, the general stationary voltage is between 11V and 13V, if it is lower than 11V, it basically means that the battery is damaged;
2. Use the diagnostic instrument to read the vehicle battery voltage data stream, if it is lower than the normal value of 11V, then judge the battery damage;
3. Using a battery detector, if the test results show that the service life is less than 43%, or the internal resistance is greater than 8 milliohms, or the detector shows that when the battery is replaced, it means that the battery is damaged or aged.
How to determine whether it is caused by the failure of the starter machine to start?
If you want to judge whether there is a problem with the motor from the fault phenomenon, there must also be a premise, that is, the battery has not failed, because the fault phenomenon after the starter is damaged and the battery is damaged is partly the same, if the battery fault is not excluded, it is easy to cause confusion, resulting in misjudgment. In general, the following failure phenomena occur after the starter is damaged:
1. When starting the vehicle, the starter does not sound (if the sound is also weak, or click, it is noisy);
2. The starter is running normally when starting, but it is actually idling, because the starting gear does not pop out in contact with the flywheel, so it is impossible to start the vehicle. The sound of the starter idling is not the same as when working normally, and I believe that many riders can hear it, so as to judge that the starter is faulty. In addition, if the starter is idle, the parts such as the wheel train transmission belt in front of the engine will not run, which can also be judged by this.
For the first failure phenomenon, you can simply deal with it emergencyly, because it is basically a carbon brush problem, you only need to find a small wooden stick to knock on the starter, and then try to restart, generally can be solved, if it is still not possible, you can only call for rescue to solve. As for the second failure phenomenon, if it is not the fault of the starter wiring harness, then only the starter can be replaced or repaired.
Since we have finished judging whether there is a problem with the starter through the fault phenomenon, we will continue to talk to you about how to judge whether the starter is faulty from a professional point of view, that is, from the perspective of detection.
1. Use the test lamp to measure the starter signal terminal, if the test light is lit at the start, the starter is damaged;
2. Use the harness short-circuit suction and pull coil and start coil terminals, if it can not work properly, the starter is damaged;
3. Use wire short connecting starter relay pins 30 and 87, if it does not work properly, the starter will be damaged.
summary
All in all, in the judgment of whether the battery or the starter causes the vehicle to fail to start, in addition to satisfying a large premise, it is also necessary to meet a small premise, that is, "it has been excluded that there is no damage to the parts related to the battery and the starter". For example, the starter relay is damaged, the starter fuse is blown, the starter wiring harness is virtually connected, and the battery positive and negative pole wiring harness is virtually connected. The reason so many premises are set is because if left unchecked, it leads to an infinite increase in the volume of discussion. Because when the scope of the discussion is expanded, in addition to judging whether the starter is not working, we must also determine whether the relay is damaged, or the fuse or the starter is not working due to the damage of the wiring harness.
Well, the above is about how to judge whether it is a battery or a starter that causes the vehicle to fail to start, hoping to help you and reduce the trouble of maintaining and using a car on weekdays.