The troubles caused by the elimination of the orphan resistance circuit in the 5th office of the 5th Army, the 2020-type off-road vehicle, the sound is intermittent when the horn is pressed; when the horn is driving at night, the headlights suddenly become dark, and the lights are restored. .
Fault check, horn relay, no ablation of the contacts, the contact arm and the electromagnetic coil are normal, the spring is not too soft, and the wires are not loose and ground. When the horn is removed, the contact is ablated. After the contact is replaced, the stun is still changing. Check again, and found that the contact is slightly ablated, and the arc-extinguishing resistor next to the universal inspection contact is used to confirm that the resistance has been short-circuited.
Troubleshoot the history of the arc suppression resistor and repair the contact shield failure phenomenon disappears.
The fault analysis force weakens the spark, protects the contacts, and parallels the arc-extinguishing resistor between the two contacts. The car generates a large current discharge due to the short circuit of the arc extinguishing electric, so that the light of the horn is darkened when the headlights are turned on at night. At the same time, due to the short circuit of the arc-extinguishing resistor, the contact is in poor contact due to ablation, and the sound is intermittent when the horn is pressed. The mouth fuse is broken, it is difficult to judge Liu Weimin's fault phenomenon. The car is a 090 type car. No matter which gear is turned on, the side lights are on and the other lights are off.
At the beginning of the fault check, it was considered that the switch line of the vehicle was connected incorrectly. Later, directly at the light relay contact, the guide wire is connected to the lamp switch power supply, and the lamp is turned on again. The lights are basically normal, but the light relay is screaming. The relay is replaced and the beep is still there. After careful inspection, the fuse was found to be blown.
Troubleshooting Replace the blown fuse. After the original cable is installed, the fault is eliminated.
Fault Analysis This fault is not complicated, but the inspection of the fuse is neglected because the sidelights are bright, which complicates the problem because it does not pay attention to the structural characteristics of the car. Because in the 91090 car, in addition to protecting the lights, the light relay can automatically turn on the side light circuit when the fuse is broken, so as to avoid accidents caused by all the lights are turned off. The reason for the automatic installation of air conditioning in the mouth is that the Yao Ming fault phenomenon is a Volvo 3 24 sedan. After installing the air conditioner, the vehicle is running for less than 20 kilometers. The engine suddenly turns off. After about 30 minutes, the engine can start again, but soon the engine is turned off again. And the juice is no longer launched.
The fault check is judged to be an ignition circuit failure based on the fault phenomenon. After the test, it was found that the spark of the central high voltage line of the ignition coil was weak. After careful inspection, only 62 of the original electronic igniters were burned, and only the tubes were scored.
Troubleshoot the engine after replacing the above two pieces. It will return to normal.
Fault Analysis After the air conditioner is installed, the heat dissipation speed of the wide engine is reduced, causing the temperature under the hood to rise, causing the electronic components to be worn by the heat, and finally the engine is turned off. To this end, a fan should be installed when installing the air conditioner to reduce the temperature under the hood. At the same time, the electric ignition unit should be moved to a place that is both ventilated and clean. The first transmission of the port transmission is bad, Zhou Ruisheng Wang Xi'an car, driving about 30,000 kilometers, the transmission is obviously jittery and noisy, and the first axis is continuously damaged.
Fault check After removing the transmission, the first shaft spline was found to be worn out. At first, it was suspected that the quality of the transmission shaft was questioned. After the time of the shaft was changed, the vibration and noise increased. Remove the transmission again and find that the shaft is loose. The clutch shaft carrier and the shaft are then replaced. However, the vibration and noise increase after the driving time. The most disintegrated engine inspection, found that the crankshaft centerline and rear side are not hanging lights.
Troubleshooting Replace the engine block! 7, the failure phenomenon disappears, the engine is running normally.
The fault analysis is on the side of the cylinder block 5 and the center line of the crankshaft is not straight. The flywheel housing and the transmission are mounted on the cylinder block. The transmission shaft is in a straight line, that is, there is an angle between the center lines of the two shafts. Thus, in the power transmission, the crankshaft An additional alternating stress acts on the first axis every revolution, and the shaft is damaged when the running time is slightly longer. Since the vehicle is produced in batches, it is inevitable that the rear side of the cylinder block is deflected during processing. There are both pneumatic chucks and manual positioning. Sometimes the original wood can be found and assembled. This congenital failure should be brought to the attention of the vehicle maintenance personnel. Why the rear axle reducer sounds badly, Wang Yanfeng Chen Jie fault phenomenon car 1040 car, replace the feed. The reducer is used for less than one month. The 17-bridge reducer is severely fault-checked. After the drive shaft universal joint and the transmission are connected, the drive shaft universal joint and the rear axle reducer drive flange sleeve drive edge The sleeve is pulled down from the axle reducer drive bevel gear shaft. It was found that the fixed bevel gear shaft fixing nut of the reducer was not loose, and the thrust washer under the same nut was cut into a circular shape outside the fixing nut, and the gland portion of the fixing nut was formed. And the fixing nut is pressed on the end of the driving bevel gear spline shaft. At the same time, the end face of the spline sleeve of the drive flange sleeve is not higher than the end of the spline shaft of the drive bevel gear of the reducer, the Tapered Roller Bearing of the drive bevel gear end is damaged, and the main and passive bevel gear tooth surfaces of the reducer are not used by the monthly magazine. Peeling off.
Trouble-shooting replaces the same type of main and passive bevel gears and two tapered roller bearings. Replace the torque of 4 mm with a hardness of 030, and a standard nut with a large hexagonal standard size. When the drive flange sleeve is fitted to the + bevel gear shaft spline, the spline end face of the drive flange sleeve is 2.5 mm above the end face of the drive bevel gear spline shaft, and then the thrust washer is mounted and then fixed. The nut is tightened to the end of the active cone axle with the specified torque and locked with a split pin. After such repairs and assembly, the car is running normally and the rear axle reducer's abnormal noise disappears.
Fault analysis 81040 type automobile rear axle reducer active. The two cone roller bearing inner races on the gear shaft are pressed against the transmission flange sleeve. The drive flange sleeve is passed by the front end of the driving bevel gear shaft (nine). The thrust washer is pressed tight. When the fixing nut is tightened, there should be a 2 mm 3 mm tapered roller bearing inner race between the inner surface of the thrust washer and the end face of the active cone street spline shaft, and the thrust washer should have a standard thickness and hardness. .
The thrust washer of the mountain reducer is not thick enough and the hardness is low; the flashing nut is a small hex nut, the size is not enough; plus the end face of the driving bevel gear spline shaft is not lower than the spline end face of the driving flange sleeve . In this way, after the speed reducer is assembled, the spacer nut is not pressed against the transmission flange sleeve through the thrust pad, but is pressed against the end surface of the driving bevel gear spline shaft, so that the two flange rollers of the driving flange and the driving bevel gear are rolled. The inner ring of the sub-bearing is evenly pressed. Under this circumstance, when the rear axle of the car is running, the transmission shaft pulls the transmission flange sleeve to make a large axial sway, and the gap between the two tapered roller bearings on the driving bevel gear shaft increases, and finally The front of the driving bevel gear is only swayed, the tooth surface is damaged, the bearing is damaged, and the factory bridge reducer has a serious noise. For example, the abnormal sound of the front wheel shock absorber, Tian Jinqi Wang Tongke failure phenomenon Santana sedan, when driving on a straight road, I can hear the buzzing sound in the front of the afternoon, when the sharp turn is obvious; when the vehicle is undulating When the road is driving, the sound is intensified, and the body continuously vibrates; as the speed increases, the sound becomes messy, and after the speed is reduced, the sound still does not disappear.
Fault check From the fault phenomenon, it may be that the front wheel shock absorber is faulty. When parking inspection, press the front of the vehicle hard, the sound will appear, the greater the force, the louder the sound, 1 feel inelastic, not particularly good. At the same time, the trace of oil leakage can be seen outside the shock absorber, indicating that the fault is on the shock absorber.
The troubleshooting history is changed to the front wheel reducer, and the fault is eliminated.
The main reason for the failure analysis is that the vehicle often runs on bad roads, and the improper driving operation and long driving mileage cause the shock absorber of the shock absorber to be damaged. What is the reason for the mouth-to-door reversal? Chen Huaping has a malfunctioning phenomenon. The 1091 has increased the number of cars. The valve is squeaking during driving. The sorrow found that the gap between the 6-cylinder intake and exhaust valves was too large, and the sound disappeared according to technical standards. After driving more than one gong, the valve sounds again. After checking, the 6-cylinder intake and exhaust valve clearance is too large.
After adjusting again, Lu will disappear. However, after driving for about a kilometer, the sound of one door reappeared, and it was still caused by the excessive clearance between the intake and exhaust valves of the six cylinders.
The fault check was carefully checked and it was found that the two valve bolts of the ninth front-to-back rocker shaft yoke bracket were loose, and the six-cylinder intake and exhaust valves were on both sides of the bracket.
Trouble-tighten the two fixing bolts and adjust the air 1 clearance. The fault is eliminated. The valve will be analyzed after the accident. After the maintenance, the repairman neglects to forget the 9th rocker arm. The two fixing bolts on the shaft fixing bracket are tightened. Therefore, when the valve clearance is 6, the sound will not appear in the beginning, but as the engine runs, the bolt will loosen, causing the gap to become larger and the ring will appear. Adjust the valve clearance again. Since the fixing bolts of the rocker shaft fixing bracket continue to loosen, the sound of the valve reappears. As long as the looseness of the fixing bolt is not solved, the valve will repeatedly sound. Therefore, before adjusting the valve clearance, check whether the fixing bolts of the lower rocker shaft fixing bracket are tight to avoid trouble. The mouth of this electronic wind is why the low speed does not turn high-speed, Li Huaiyu fault phenomenon Audi 1002.2 sedan, its electronic wind speed does not turn at low speed, high speed is normal.
Fault check Turn on the ignition switch, turn on the air conditioner switch after starting the engine, and the air conditioning system is running normally. However, if the fan does not turn at a low speed, the engine will be turned off in time. In this case, the air conditioner should be stopped immediately. Then hit the ignition switch, unplug the temperature control switch, and measure the lack of fire line. Take the root wire and connect the fire wire to the blue-green channel of the high-speed relay switch wire. The electronic fan runs at high speed, then remove the wire and turn on the red-green trajectory of the low-speed relay's sweat line. The low-speed relay hums and measures. The 87-connector of the low-speed relay has a thick white wire, but the electronic fan still does not expect to remove the headlights at this time. The thick white wire of the step-down resistor has a fire, and the motor line of the second head is red and black, and there is no fire. This joint was found to be ablated due to long-term overheating.
Trouble-shooting will clean the post and replace it with a new wire. After the new line is connected, the engine will start and the fault will disappear.
Fault Analysis The design of the Audi 1002.2 sedan is based on the fact that the engine cooling water temperature is too high or the air conditioner is used automatically to ensure that the cooling water temperature is within the specified range, while ensuring air conditioning.
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