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Vehicle computer detection methods are as follows:
1. Visual detection
Visual detection is to rely on the vision of the maintenance staff to observe the working status of the circuit, components, etc., to find anomalies, to directly find the fault part and reason. The advantages of the visual detection are simple and convenient, and the fault location can be found directly. The disadvantage is that many faults are not found on the exterior of the component.

The visual detection is suitable for the detection of various kinds of faults, especially some hard faults, such as the internal corrosion of the vehicle computer, the smoke of components and other faults are easy to find. The effect of separate use during maintenance is not obvious, and it needs to be used in conjunction with other detection methods.

2. Touching detection
Requires the vehicle computer to determine whether the temperature of the vehicle terminal board is good or bad through touch, checking whether the temperature is normal, or by smelling whether it is burned or not. The advantages of the touching detection are convenience, simplicity, and pertinence, and can directly identify the fault location. The disadvantage is that maintenance personnel must have a wealth of touching detection experience in order to check accurately.

The touching detection method is applicable to some heating elements under high current working conditions, such as electronic fuel injectors, various solenoid valves and motor drive elements, ignition power elements, and so on.

3. Fault regeneration
The fault regeneration refers to the consciously recurring faults, so as to provide sufficient observation opportunities, times, time, and procedures to find the cause of the fault. It is mainly applied to some intermittent failures, such as when the vehicle terminal is working in good times and bad times.

4. Reference detection
The reference detection is an detection method that uses comparative means to find faults. Usually use a normal vehicle computer board to measure the parameters of voltage, resistance and other key components, use substitution, comparison and other means to identify the differences, to identify the fault parts and the reasons.

5. Replacement detection
The replacement detection refers to using a normal component to replace a suspected component. If the substitute is normal, the determination is correct, and if the fault does not change after replacement, the fault scope can be reduced. When using the replacement detection, it should be noted that sometimes a fault may be caused by the damage of two components. If only one component is replaced with no effect, it will be mistaken for this component to be good and easy to miss the fault point. When replacing components, the computer board must be powered off.

6. Voltage detection
The voltage detection is mainly to measure the voltage of the key points of the vehicle computer board and find out the fault location. For example, the power supply for each integrated circuit, the main battery power supply, the power supply controlled by the ignition switch, and the internal power supply with an integrated voltage stabilizer or a regulated power supply for adjusting the output of the transistor. It can be detected with an ordinary multimeter, which is very convenient and practical.

7. Resistance detection
Resistance detection refers to the use of multimeter Ohm file, by checking the line on and off, the resistance value, and the detection of the components to determine the cause and location of the fault. You can detect resistance, diodes, transistors, and integrated circuits and components.

8. Oscilloscope detection
The oscilloscope detection method refers to the measurement of the waveform of the key points of the vehicle terminal by using a car-specific or general-purpose oscilloscope, and measuring the relevant pins of the CPU to see if it is normal. You can simulate the signals of various sensors.

9. Signal injection detection
The signal injection detection refers to using the signal generator to input signals to the circuit and observing the action of the actuator at the output end, or connecting an oscilloscope or a multimeter at the output end to determine the fault according to the waveform indicated by the oscilloscope and the signal level displayed by the multimeter range.

In addition to the above methods, we must also pay attention to the following points:
1. First investigate, and then become familiar. When repairing a vehicle computer board, it is first necessary to inquire about the process of failure and the phenomenon of failure, whether it is a sudden phenomenon or it has existed before, under what conditions, such as high temperature, low temperature, or a specific environment, according to these conditions analyze the circuit and conduct targeted tests.

2. First static detection, later dynamic detection. Static detection means that the computer board is tested before it is powered on. When the static detection is OK, then we conduct dynamic detection. If smoke, abnormal high temperature and other conditions are found, power should be cut off quickly and static testing should be conducted again to avoid powering up and causing undue damage if the situation is not clear.

3. First peripheral detection, then internal detection. When repairing the integrated circuit, it is necessary to check the peripheral circuit first to confirm that the peripheral circuit is normal, and then consider replacing the integrated block. From the point view of maintenance experience, the peripheral circuit failure rate is higher than the internal failure.

4. First common faults detection, then special faults detection. According to the common characteristics of the vehicle terminal board, common faults with universality and regularity are excluded first, such as output-driven related circuits, and then the special circuit is checked. Reduce the scope of faults and shorten repair time.

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