I. From simplicity to difficulty
When a vehicle enters the maintenance plant, we can learn from the maintenance that the failure needs to be addressed. For example, engine failure lights, glide speed, black smoke, unfuelled refuelling, automatic transformers are unstoppable, and brakes slide. We can choose a simpler solution, and when it is resolved, other issues will be solved。
For example, a car with a tequila (four-cylinder engine) with engine failure lights, black smoke, lighter fire, hard to start when it's off, and a glitch needle。
Because it's the engine failure code, it's simpler, it's targeted, and we're using it as a breakthrough. (i) accelerator failure. 2) water temperature sensors fail. 3) main computer failure。
We first examine the air-saving door position sensors, remove the sensor plugs, use the change in the openness of the gas-saving doors in tens of thousands of meters, meet the standard values and do not show fluctuations, indicating that the sensor is non-functional. It also measures the wire beams from the sensor to the computer, and it shows a high resistance value. The line was then cleared, the main beam was removed in segment, until the main plug in the left rear of the engine room, where it was found to have worn marks, the total line was removed, several pieces were found to have been worn and several lines had been broken. Clear the liner, load the vehicle, clear the fault code, test the vehicle, and the above-mentioned malfunctions disappear。
Because it has been repaired in other workshops, but it has not worked as well, we have used the right method to solve problems quickly, accurately and economically。
Ii. Segregation
This method is a component (e. G. A) that controls or protects several other work components (e. G. B, c, d). When one of the parts (e. G. B) fails, it affects the control (a) and results in other parts (c or d) not working properly. When the control (a) fails, we do not know which of the work (b, c, d) fails. One of the components (b) will not work first, and if the control (a) works normally with the other parts (c, d), it will be stated that it (b) is damaged。
For example, a mercedes 320 car sometimes has no air conditioners, wind machines do not work and insurance number 21 is often burned。
It is known from the statement of insurance that it controls the power lines of wind turbines to retort, controls rain scratching and provides one of the power lines for air conditioning. So, first, the wind engine's speed-retarding plugs were removed or the insurance was burned; the automatic air-conditioning computer plugs were removed and the insurance was still burned; and then the rain scratch plugs were removed, as the power line provided a fireline mainly for the rain-scraping water-speech sensor, and when the plugs were removed, we found that the beams showed signs of looseness between the engine covers and the jets. When the hood was shut off, the beam was caught in iron by the engine support. After correct processing, the failure is solved。
The method is also used for the repair of automatic transformers when a problem arises in one or two blocks. We test the oil pressure and speed failure points for each block before dismantling the automatic transformer, and then we can look at the direction of the oil route and find out where the problem is。
In addition, the can-bus system has been used for vehicles after 2000 in accordance with the international uniform regulations on car manufacturing. The separation will help us deal with future vehicle failures
Iii. Structure
The method is to use the knowledge we have learned and the various detection devices to gradually detect malfunctions, and it is often used for soft failures and complications。
For example, a mitsubishi v6 car with a higher throttle of up to 3,000 r/min. We first check the ignition system, replace the spark plugs, and measure the pressure line, which meets the standard values. The gas filter was cleaned and the pump pressure tested. Clean up the nozzles. Cleaning the air-saving doors to nasa and ensuring that the gas-inventing system is normal. But the problem remains unresolved. The engine failure code was drawn from the detection instrument, but there was no failure output, and the main sensors were tested with a oscillator, which met standard values. Indicate that the circuit system is normal. Check the ignition and cask pressure, normal. In a few large systems, only the exhaust system is not checked. So the silencer was removed, and the refuelling went well, and the malfunction went away。
The exhaust pressure of the silencer is often ignored, with a three-dollar catalyst in the silencer in the electronic fuel jet system vehicle. Over a long period of time, congestion can occur, resulting in excessive exhaust pressure, resulting in unfuelled engine refuelling and high temperature failure. Such failures often occur in mercedes, bmw, daewoo and modern times。
Iv. Inversion
The method is to analyse the causes of all malfunctions before dealing with them in a calm and sober manner, taking into account all failures. That is the reason for the reversal of the phenomenon, identifying the key to the problem and focusing on breakthroughs。
V. Comparation
The method, which is the two same vehicle exchange elements or comparative values used to resolve failures, is applied to special service stations and to dealing with difficult problems, and although not scientific, it is able to resolve failures in a timely and accurate manner and to receive financial benefits in a timely manner。
