Saturday, August 6, 2011
Vehicle maintenance description
Vehicle maintenance description Vehicle maintenance is to adapt to social development, as China's social development, the number of cars increases, the lack of vehicle maintenance personnel, need a group of professional, high quality service personnel. Automotive Maintenance Technology Training objectives: to develop moral, intellectual and physical development, to adapt to social and economic development needs, with good professional ethics, to understand the principles and structure of the automotive engine components, a certain amount of electrical and electronic theory and the skills and knowledge, automotive electronic control technology and traffic regulations, car fault diagnosis, testing, maintenance and other theories and skills and knowledge, has a certain public communication skills and business development capabilities of mid-level technical personnel. Employment orientation: appropriate in the vehicle inspection and maintenance, car insurance, car driving, car sales, but also engaged in business with the automotive industry and management. Research skills: electrical installation and maintenance of operating permits, operating permits welder, automotive service technician class license (permit intermediate maintenance division, maintenance division senior certificates), gas-liquid technology, electronically controlled operation certificate, the National Public English Certificate, National Computer Rank card, etc. . Main courses: electrical electronic technology and skills, fitter skills, construction and automotive engine repair, automatic transmission works and maintenance, chassis construction and maintenance, and repair automotive electrical equipment, electronic control and engine repair, automotive air conditioning theory and maintenance . Edit this paragraph common mistakes car maintenance methods 1> Remove the engine thermostat blind due to engine temperature is high and if the blind removal of the thermostat, coolant can be a cycle, can not adjust the cooling intensity, it is difficult to ensure that the engine temperature in a more appropriate work, but often in the engine work under low temperature, resulting in decreased engine power, accelerating wear and tear, increased fuel consumption. If the engine thermostat failure repair or replacement, the engine temperature is higher, it should repair other parts of the cooling system can not remove the thermostat. 2> high engine temperature are afraid that some people are not afraid of driving with low engine temperature low fear high fear. In fact, the engine temperature is low is also a great danger. Should be used according to instructions provided for the normal car driving temperature, in order to ensure the engine's life. 3> the better the pump fan belt tightening belt tightening is not possible. Not only will it stretch the belt too tight or broken, shorten the life of the belt, but also because of excessive tension, causing the generator shaft, pump shaft and bearing deformation of bending the early damage. Automotive engine fan belt tightness should meet the technical requirements, the normal deflection of the belt assembly 10-15mm is appropriate. 4> use the engine idle speed with idle heating temperature, due to low speed, machine lubricating oil pump can not quickly be pressed into the surface of the lubrication, oil is also low, the engine friction of moving parts in the dry or semi-state friction work; poor fuel atomization due to low temperature, so that unburned fuel (mixture) into the crankcase, washed away the oil film on the cylinder wall, will accelerate the mechanical wear and tear. So, after a few seconds the engine starts, the application of fast idle temperature (in modern cars are fast idle on a dedicated device, machine temperature rise, it will automatically adjust to the idle state), to improve engine lubrication. 5> roasted with a blowtorch blowtorch baked with oil at the end of the oil at the end of winter, not only will the oil additive in the chemical changes, loss of the original performance, but also the oil cement, oil at the end of deformation, can cause fire. The best approach is based on local selection of winter minimum temperature compatible oil. In localities where conditions permit, it is best insulation to vehicles parked in a garage facility. The removal method is more advanced ultrasonic spray method and the removal of nuclear clearance method, but used the most, the easiest way is to remove the physical removal and chemical methods. These two methods can be used along.
Toyota Camry engine ignition failure
Toyota Camry engine ignition failure
Symptom: a Toyota Camry sedan engine has ignition signs, but not up and running.
Diagnosis: As the electric engine control system is relatively complex and relatively high reliability, we have the spirit of the principles of the easier issues first checks.
First, check whether the normal high-voltage arcing. Unplug the flash high-voltage single-cylinder test, found that spark intense, bright, that the ignition system to normal.
Then check the intake channel is open. Remove the air filter and found that more dust the top with a net after-loading high-pressure air blowing on, start the engine, the fault remains.
Then check the oil. Oil pressure gauge connected to the fuel pipe on the road, start the engine, measured the fuel pressure is only 10kMPa (normal is between 230 ~ 250kPa). Check the pipe does not leak the office, turn the ignition switch can hear the sound of electric fuel pump operation; so that may be due to blocked fuel filter or tubing, resulting in hydraulic systems can not be established. Then replace the fuel filter, clean lines and high pressure air blowing, but after loading start vain. Then oil is then measured 110kPa, concluded that electric fuel pump damage, the pressure can not be established. Remove the fuel pump from the fuel tank, fuel pump out the oil carefully observed cracks in the mouth, estimated fuel leaking from here, back to the tank, then determined by the test case, the replacement of a new fuel pump, troubleshooting.
Conclusion: EFI engine electronic control system works relatively high reliability, such as the computer running over 150,000 km in it may be faulty, so the experience-based EFI engine failure should do first check, the easier to find fault. According to experience, EFI engine failure occurred in the oil on the road, because the fuel injection system and high precision, high quality requirements for fuel, so the failure of most of the oil on the road with oil, such as the common fault "electric fuel pump supply shortage." and "bad injector fuel injection" are related to fuel quality related. Of course, this case is rather special, ask the driver to know by then, the chassis had been scratched stones, may run into fuel pump, causing damage, the long-running, gradually so severe that the engine can not start.
Symptom: a Toyota Camry sedan engine has ignition signs, but not up and running.
Diagnosis: As the electric engine control system is relatively complex and relatively high reliability, we have the spirit of the principles of the easier issues first checks.
First, check whether the normal high-voltage arcing. Unplug the flash high-voltage single-cylinder test, found that spark intense, bright, that the ignition system to normal.
Then check the intake channel is open. Remove the air filter and found that more dust the top with a net after-loading high-pressure air blowing on, start the engine, the fault remains.
Then check the oil. Oil pressure gauge connected to the fuel pipe on the road, start the engine, measured the fuel pressure is only 10kMPa (normal is between 230 ~ 250kPa). Check the pipe does not leak the office, turn the ignition switch can hear the sound of electric fuel pump operation; so that may be due to blocked fuel filter or tubing, resulting in hydraulic systems can not be established. Then replace the fuel filter, clean lines and high pressure air blowing, but after loading start vain. Then oil is then measured 110kPa, concluded that electric fuel pump damage, the pressure can not be established. Remove the fuel pump from the fuel tank, fuel pump out the oil carefully observed cracks in the mouth, estimated fuel leaking from here, back to the tank, then determined by the test case, the replacement of a new fuel pump, troubleshooting.
Conclusion: EFI engine electronic control system works relatively high reliability, such as the computer running over 150,000 km in it may be faulty, so the experience-based EFI engine failure should do first check, the easier to find fault. According to experience, EFI engine failure occurred in the oil on the road, because the fuel injection system and high precision, high quality requirements for fuel, so the failure of most of the oil on the road with oil, such as the common fault "electric fuel pump supply shortage." and "bad injector fuel injection" are related to fuel quality related. Of course, this case is rather special, ask the driver to know by then, the chassis had been scratched stones, may run into fuel pump, causing damage, the long-running, gradually so severe that the engine can not start.
Six common fault auto repair
Six common fault auto repair 1, auto fuel gauge are not allowed
I bought the car for some time, now has a small problem, though not affect the use, but also made me very convenient. The problem lies in my fuel gauge, it's absolute accuracy is doubtful. The first 1 / 2, the pointer down very slowly, but after a half later, I feel like the engine oil is generally in the drink, brush pointer fall down. Every time I would arrive at the pointer when the last white line to the fuel, but oil is sometimes added to 100, and rose to the position of the pointer is not the same. Even once to fill the oil, the pointer can not reach the peak, how is this going?
Treatment advice: on the fuel gauge pointer is not the same rate of decline in the rate of this phenomenon, there may be design problems, some models of the fuel gauge itself is not a linear manner in accordance with the design, the first half slow and half fast after this a phenomenon should be relatively normal. Fuel gauge pointer is unstable and may form the oil level sensor oil problem. If confirmed to fill the oil after, not the table pointer does not reach the peak, should monitor the fuel gauge problem. These problems to the repair shop maintenance click on it.
2, auto power windows automatically drop suddenly
My car is in the high-end models, four electric windows are standard equipment, have been extremely easy to use, especially the main driving down the side of a key design, eliminating some of the fees through the site, to always press live controls trouble than I had that car electric windows and doors better. But things have advanced a variety of problems, now my main drive side power window whenever rise to the top, it will automatically drop a sudden, confused every time I close the window of time, but also carefully control it, the easy way into trouble, the control system will not be a problem with it?
Treatment advice: General limousine in the design of power windows will be installed on a pinch function, you avoid the unexpected operation resulting in personal injury. The vehicle's use, if the door is lined with some objects inside the top box, to rise to this part of the window when the sensor will start anti-pinch function, so the windows down. In addition, sometimes at high speed the process, because the glass will cause the voltage smoothly along the track can not be increased, can lead to anti-pinch function of the feature is activated. In this case, the best to the service station about special adjustment, check for foreign objects impact windows down, and make adjustments.
3, car headlights Mifengbuyan
Some time ago the climate variability often heavy rain phenomenon, my car also be ups and downs, finally, God forbid, my car had a crisis again and again, did not become a victim of urban water under the overpass, which is also part of I credit the excellent standard of driving. Although the car did not sacrifice in the rain, but this stretch of water really brought me a lot of trouble. Just about finished the rain, the headlights of my car is a fine mist of water, you said that the mist in the shade which I can not rub ah! Think of the car when the fog now, you can use baking way to remove warm air, I do not know whether this also applies to the practice of baking in the headlights it?
Treatment advice: As the lights Mifengbuyan, cleaning, and when it rains water is likely to result, and when a larger temperature difference between inside and outside when the fog will form. This time it is best not to bake, the lights are generally polymer materials, if the baking temperature is too high, it may cause the lights in softening the appearance of deformation, affect the use and appearance. In addition, the current lights are generally monolithic, transparent shade, the lamp will be stuck with a body to protect the back, between the two high-temperature baking may result in bonding resin melt, increasing the car the possibility of light water. In general, the lights in the water in the sunlight during the day can quickly evaporate away, if your lights frequent water phenomenon, you should check the lights to the service station body to see is not due to collisions lights damaged, resulting in frequent water.
I bought the car for some time, now has a small problem, though not affect the use, but also made me very convenient. The problem lies in my fuel gauge, it's absolute accuracy is doubtful. The first 1 / 2, the pointer down very slowly, but after a half later, I feel like the engine oil is generally in the drink, brush pointer fall down. Every time I would arrive at the pointer when the last white line to the fuel, but oil is sometimes added to 100, and rose to the position of the pointer is not the same. Even once to fill the oil, the pointer can not reach the peak, how is this going?
Treatment advice: on the fuel gauge pointer is not the same rate of decline in the rate of this phenomenon, there may be design problems, some models of the fuel gauge itself is not a linear manner in accordance with the design, the first half slow and half fast after this a phenomenon should be relatively normal. Fuel gauge pointer is unstable and may form the oil level sensor oil problem. If confirmed to fill the oil after, not the table pointer does not reach the peak, should monitor the fuel gauge problem. These problems to the repair shop maintenance click on it.
2, auto power windows automatically drop suddenly
My car is in the high-end models, four electric windows are standard equipment, have been extremely easy to use, especially the main driving down the side of a key design, eliminating some of the fees through the site, to always press live controls trouble than I had that car electric windows and doors better. But things have advanced a variety of problems, now my main drive side power window whenever rise to the top, it will automatically drop a sudden, confused every time I close the window of time, but also carefully control it, the easy way into trouble, the control system will not be a problem with it?
Treatment advice: General limousine in the design of power windows will be installed on a pinch function, you avoid the unexpected operation resulting in personal injury. The vehicle's use, if the door is lined with some objects inside the top box, to rise to this part of the window when the sensor will start anti-pinch function, so the windows down. In addition, sometimes at high speed the process, because the glass will cause the voltage smoothly along the track can not be increased, can lead to anti-pinch function of the feature is activated. In this case, the best to the service station about special adjustment, check for foreign objects impact windows down, and make adjustments.
3, car headlights Mifengbuyan
Some time ago the climate variability often heavy rain phenomenon, my car also be ups and downs, finally, God forbid, my car had a crisis again and again, did not become a victim of urban water under the overpass, which is also part of I credit the excellent standard of driving. Although the car did not sacrifice in the rain, but this stretch of water really brought me a lot of trouble. Just about finished the rain, the headlights of my car is a fine mist of water, you said that the mist in the shade which I can not rub ah! Think of the car when the fog now, you can use baking way to remove warm air, I do not know whether this also applies to the practice of baking in the headlights it?
Treatment advice: As the lights Mifengbuyan, cleaning, and when it rains water is likely to result, and when a larger temperature difference between inside and outside when the fog will form. This time it is best not to bake, the lights are generally polymer materials, if the baking temperature is too high, it may cause the lights in softening the appearance of deformation, affect the use and appearance. In addition, the current lights are generally monolithic, transparent shade, the lamp will be stuck with a body to protect the back, between the two high-temperature baking may result in bonding resin melt, increasing the car the possibility of light water. In general, the lights in the water in the sunlight during the day can quickly evaporate away, if your lights frequent water phenomenon, you should check the lights to the service station body to see is not due to collisions lights damaged, resulting in frequent water.
Shaking car were indicative of what
Shaking car were indicative of what Car use for some time, some owners may find some little body shake, but do not know what went wrong. "Body shake" is a signal that tells the owner the car has a problem. Professional teacher told us more than soldiers, the body shake may seem a trivial, if not pay attention to testing, will lead to a large hidden faults. So, the body shake is a problem caused it? Ordinary car owners how to determine and resolve?
Shake that body in motion
If the driving process, the body found in a slight jitter or offset, is generally caused by tire failure. First, the tire balance may be in poor condition, require the owner as soon as possible to do a wheel alignment and balancing, if the vehicle does not tire balancing to do some wandering.
Outside a situation is more serious, probably because the deformation caused by steel ring, which requires the owner to a professional repair shop check. This situation generally occurs in the vehicle body a longer life. General automotive replacement tires, new rims tires when they do a balance, otherwise the weight on the steering wheel is not likely to occur when the average jitter phenomenon. Body shake on driving comfort and control to determine the effect will be.
The third situation is unbalanced because the shaft deformation caused by the general situation in the chassis of the car had more impact.
Body shake when idle
Jitter is a lot of idle vehicle owners often face the situation. If the owners start the vehicle or the vehicle is not suspended off the engine, if found to significantly shake the body, it may mean that the vehicle the following three conditions exist:
1 Engine serious coke
Jitter caused by car is the most common cause of injector throttle too dirty or too much coke. When too much carbon deposits inside the engine when cold start injector head may be emitted carbon absorbs gasoline, resulting in cold start mixture too thin, making difficult to start, this situation, only the carbon absorbed by the gas until saturation, it is easy with the car, the car adsorbed on carbon will be on gasoline engine combustion cylinder vacuum suction aspiration, and the mixture thickens, when the engine's fuel mixture when the concentration of rare, resulting in cold start idle jitter. Lower the temperature, cold start the greater the amount of oil needed, the presence of carbon will affect the cold start of the more successful or not.
The solution: Clean oil, check the idle speed motor should be cleaned if there is carbon.
(2) ignition system problems
Check spark plugs, ignition coil high voltage wire and working conditions, the ignition system working poor, bad spark plug arcing condition can cause the same type of symptoms.
Solution: Check the spark plug is too much carbon, the replacement of spark plugs.
3. Hydraulic instability
If you have already cleaned up the engine carbon deposits, washed throttle, oil pads, and spark plugs replaced, are still found in the body shake when idle, we recommend that you check the fuel supply to the 4S shop inlet pressure and pressure sensors are normal, if the oil pump pressure is not normal or intake air pressure sensor values ??will cause errors and bad body work jitter.
Solution: Check the oil, if necessary, replacement parts.
4, engine components aging
Automotive engine feet with jitter (also known as machine paw pads) aging. Engine Mount is the engine suspension system, engine feet when the engine is running is responsible for absorbing the subtle jitter, if the engine foot problems, these vibrations will spread to the steering wheel, the cab, resulting in jitter when idle.
The solution: replacement parts
Shake that body in motion
If the driving process, the body found in a slight jitter or offset, is generally caused by tire failure. First, the tire balance may be in poor condition, require the owner as soon as possible to do a wheel alignment and balancing, if the vehicle does not tire balancing to do some wandering.
Outside a situation is more serious, probably because the deformation caused by steel ring, which requires the owner to a professional repair shop check. This situation generally occurs in the vehicle body a longer life. General automotive replacement tires, new rims tires when they do a balance, otherwise the weight on the steering wheel is not likely to occur when the average jitter phenomenon. Body shake on driving comfort and control to determine the effect will be.
The third situation is unbalanced because the shaft deformation caused by the general situation in the chassis of the car had more impact.
Body shake when idle
Jitter is a lot of idle vehicle owners often face the situation. If the owners start the vehicle or the vehicle is not suspended off the engine, if found to significantly shake the body, it may mean that the vehicle the following three conditions exist:
1 Engine serious coke
Jitter caused by car is the most common cause of injector throttle too dirty or too much coke. When too much carbon deposits inside the engine when cold start injector head may be emitted carbon absorbs gasoline, resulting in cold start mixture too thin, making difficult to start, this situation, only the carbon absorbed by the gas until saturation, it is easy with the car, the car adsorbed on carbon will be on gasoline engine combustion cylinder vacuum suction aspiration, and the mixture thickens, when the engine's fuel mixture when the concentration of rare, resulting in cold start idle jitter. Lower the temperature, cold start the greater the amount of oil needed, the presence of carbon will affect the cold start of the more successful or not.
The solution: Clean oil, check the idle speed motor should be cleaned if there is carbon.
(2) ignition system problems
Check spark plugs, ignition coil high voltage wire and working conditions, the ignition system working poor, bad spark plug arcing condition can cause the same type of symptoms.
Solution: Check the spark plug is too much carbon, the replacement of spark plugs.
3. Hydraulic instability
If you have already cleaned up the engine carbon deposits, washed throttle, oil pads, and spark plugs replaced, are still found in the body shake when idle, we recommend that you check the fuel supply to the 4S shop inlet pressure and pressure sensors are normal, if the oil pump pressure is not normal or intake air pressure sensor values ??will cause errors and bad body work jitter.
Solution: Check the oil, if necessary, replacement parts.
4, engine components aging
Automotive engine feet with jitter (also known as machine paw pads) aging. Engine Mount is the engine suspension system, engine feet when the engine is running is responsible for absorbing the subtle jitter, if the engine foot problems, these vibrations will spread to the steering wheel, the cab, resulting in jitter when idle.
The solution: replacement parts
Passat 1.8T can not start failure
Passat 1.8T can not start failure Model: Passat 1.8T Passat
; Mileage: 2025km
Symptom:
A 2007 production of Shanghai Volkswagen Passat 1.8T Passat automatic transmission car, engine and equipped with BGC 01V tiptronic 5 speed transmission, mileage 2025km. Rescue phone owners play reflected in the case of the red car in motion when the engine suddenly stop, can not start the car several times. Rescue workers rushed to the scene to conduct a preliminary examination, the ignition switch ON state, the dashboard lights and brake pedal in addition to EPC light is off, the other information shows no abnormalities. Try to start the engine, the engine can start, but after running for about 1s, then off. Try to start the fault persists, the overall feel of the phenomenon with a similar engine immobilizer, but K117 does not light or alarm light flashing, then dragged into the car repair station for further examination.
Failure Analysis:
Connect VAS5052 fault diagnostic apparatus, the engine control unit J220 query failure memory, display identification to a fault code :18056 - transmission data bus failure. And the fault code can not be cleared, non-accidental failure. Select the data block options, read out the engine control unit and power system data bus for communication between control units of other measurements, display group 125: Transmission 0, instrument cluster 0; 126 display group: airbag 0, indicating that J220 and transmission and airbag control units communicate all interrupt.
Passat 1.8T automatic car CAN data bus power system equipment on the engine control unit J220, automatic transmission control unit J217, instrument cluster control unit J285, ABS control unit J104 and airbag control unit J234, this time with necessary to enter the gateway using VAS5052 fault diagnostic control unit J533, with a view to check the gateway's CAN data bus power system communication status, to determine the engine control unit on the data bus can not communicate the nature of the fault that data to determine the cause of the malfunction bus has been disrupted, or local data bus link short-circuit or open circuit occurred.
Integrated into the gateway in the instrument control unit J533 check fault code :01314 - engine control unit is no communication, currently exist; 01315-- transmission control unit is no communication, occasional. Clear the fault code execution operation, 01,314 can not be deleted. Select the data block options, read the measurement value display group 125: Engine 0, transmission 1; 126 set to a measured value: the airbag 1. The examination shows that the gateway system in addition to the engine and power control unit other than the normal communication, nature of the fault belongs to the engine control unit and power system data bus between the local circuit.
1s from the engine can start running the analysis of phenomena, the engine control unit power supply should be no problem, VAS5052 access to the engine control unit can also prove that the normal power supply, which determine the J220 engine control unit can not communicate for two reasons: First, the engine control unit and data bus connected to external interrupt lines, and second, the engine control unit J220 in the CAN data bus transceiver circuit part of the damage occurred. Based on the above analysis, the next step just check the external power system CAN line data bus will be able to determine the cause of the fault condition.
Access to BGC engine circuit, find the side of the engine control unit wiring harness connector in the T121/58, T121/60, and combination meter control unit wiring harness side connector of the T32b/20, T32b/19, respectively, for the power system data bus CAN-L (orange / brown) and the CAN-H (orange / black) terminals. Disassemble the engine control unit connector and combination meter control unit of the green connector, measuring J220 and J285 connector harness side connector harness side corresponding to the terminals of continuity. Measurement results show that, J220's and J285's T32b/20 T121/58 terminal resistance between terminals as 0.2Ω, J220's and J285's T32b/19 T121/60 terminal resistance between terminals as 0.5Ω, indicating that J220 and J285 between The link does not disconnect the external data bus. According to the inspection concluded that, since the external data bus line is normal, cause of the malfunction can be identified as the engine control unit of the data bus transceiver is a problem.
Replacement of the engine control unit, the ignition switch to the ON position, instrument lights and brake pedal on the EPC light is on. Connect VAS5052 fault diagnostic re-enter the gateway J533, access to the data block group 125 shows the measured values, shown as: engine 1, transmission 1. This indicates that the engine control unit and data bus traffic returned to normal. Remove the control unit stores the fault code, read out with a password to read the car's instrument four security password, enter the leading options to complete the encoding of J220 and J220 and J285 match between the security of the throttle control unit J338 basic settings. Complete this series of operations, start the engine, the engine starts running smoothly, the road test to confirm the engine is working properly in all conditions, failure ruled out.
; Mileage: 2025km
Symptom:
A 2007 production of Shanghai Volkswagen Passat 1.8T Passat automatic transmission car, engine and equipped with BGC 01V tiptronic 5 speed transmission, mileage 2025km. Rescue phone owners play reflected in the case of the red car in motion when the engine suddenly stop, can not start the car several times. Rescue workers rushed to the scene to conduct a preliminary examination, the ignition switch ON state, the dashboard lights and brake pedal in addition to EPC light is off, the other information shows no abnormalities. Try to start the engine, the engine can start, but after running for about 1s, then off. Try to start the fault persists, the overall feel of the phenomenon with a similar engine immobilizer, but K117 does not light or alarm light flashing, then dragged into the car repair station for further examination.
Failure Analysis:
Connect VAS5052 fault diagnostic apparatus, the engine control unit J220 query failure memory, display identification to a fault code :18056 - transmission data bus failure. And the fault code can not be cleared, non-accidental failure. Select the data block options, read out the engine control unit and power system data bus for communication between control units of other measurements, display group 125: Transmission 0, instrument cluster 0; 126 display group: airbag 0, indicating that J220 and transmission and airbag control units communicate all interrupt.
Passat 1.8T automatic car CAN data bus power system equipment on the engine control unit J220, automatic transmission control unit J217, instrument cluster control unit J285, ABS control unit J104 and airbag control unit J234, this time with necessary to enter the gateway using VAS5052 fault diagnostic control unit J533, with a view to check the gateway's CAN data bus power system communication status, to determine the engine control unit on the data bus can not communicate the nature of the fault that data to determine the cause of the malfunction bus has been disrupted, or local data bus link short-circuit or open circuit occurred.
Integrated into the gateway in the instrument control unit J533 check fault code :01314 - engine control unit is no communication, currently exist; 01315-- transmission control unit is no communication, occasional. Clear the fault code execution operation, 01,314 can not be deleted. Select the data block options, read the measurement value display group 125: Engine 0, transmission 1; 126 set to a measured value: the airbag 1. The examination shows that the gateway system in addition to the engine and power control unit other than the normal communication, nature of the fault belongs to the engine control unit and power system data bus between the local circuit.
1s from the engine can start running the analysis of phenomena, the engine control unit power supply should be no problem, VAS5052 access to the engine control unit can also prove that the normal power supply, which determine the J220 engine control unit can not communicate for two reasons: First, the engine control unit and data bus connected to external interrupt lines, and second, the engine control unit J220 in the CAN data bus transceiver circuit part of the damage occurred. Based on the above analysis, the next step just check the external power system CAN line data bus will be able to determine the cause of the fault condition.
Access to BGC engine circuit, find the side of the engine control unit wiring harness connector in the T121/58, T121/60, and combination meter control unit wiring harness side connector of the T32b/20, T32b/19, respectively, for the power system data bus CAN-L (orange / brown) and the CAN-H (orange / black) terminals. Disassemble the engine control unit connector and combination meter control unit of the green connector, measuring J220 and J285 connector harness side connector harness side corresponding to the terminals of continuity. Measurement results show that, J220's and J285's T32b/20 T121/58 terminal resistance between terminals as 0.2Ω, J220's and J285's T32b/19 T121/60 terminal resistance between terminals as 0.5Ω, indicating that J220 and J285 between The link does not disconnect the external data bus. According to the inspection concluded that, since the external data bus line is normal, cause of the malfunction can be identified as the engine control unit of the data bus transceiver is a problem.
Replacement of the engine control unit, the ignition switch to the ON position, instrument lights and brake pedal on the EPC light is on. Connect VAS5052 fault diagnostic re-enter the gateway J533, access to the data block group 125 shows the measured values, shown as: engine 1, transmission 1. This indicates that the engine control unit and data bus traffic returned to normal. Remove the control unit stores the fault code, read out with a password to read the car's instrument four security password, enter the leading options to complete the encoding of J220 and J220 and J285 match between the security of the throttle control unit J338 basic settings. Complete this series of operations, start the engine, the engine starts running smoothly, the road test to confirm the engine is working properly in all conditions, failure ruled out.
Novice repair of several techniques
Novice repair of several techniques 1 trick: to know ourselves puzzled owners choose repair car repair workshops Which?
Mr. Liu, the owner of the car just after the warranty period there have been some unexpected small problems, which makes him very upset, what should be where to repair it? Shop cheap, big shops expensive. To save money it wanted to shop, but also worried that "no good cheap goods", to a large store it, and do not want to spend more money.
This can be done?
Expert doubts
Repair be sure to choose a reliable repair workshop, key indicators include a reliable quality (technical level, quality of service), price, size (reliability, service, quality assurance cycle), claims, etc.
General maintenance of large-scale plant is no room for bargaining, we often say Diandaqike: a big yard, big momentum. Although the factory does not mean that all aspects of great good, but at least on the scale and technical strength, there is a certain protection. And although the price is very cheap roadside shop, once the problems are often very difficult to solve.
Therefore, to choose a regular or car repair shop, although charges are a little more than roadside shop, but it charges it will give a little more vehicle owners are very safe, long-term commitment to quality, this is a very bargain thing.
2 strokes: distant past attack owners wondering booking service, OK?
Owner Mr. Wang said that he was particularly busy, like to book repair, do not know Can you do the other will not be any problems?
Expert doubts
Telephone and online booking service will not only save time to repair, but also the first customer.
Appointment in the maintenance operation and maintenance of plant, be sure to cars failures is described as detailed as possible, clear, plant maintenance technicians in order to obtain guidance. Plant operations and maintenance through personnel exchanges, we can find not only the quality of maintenance plant employees, and plant maintenance technicians can learn the technical level: a good service technicians to ask fault conditions, should take the trouble, very detailed, Because the only way to help determine the cause of failure. Conversely, half-hearted rush end communication, the accuracy of the failure process is doubtful.
TIP 3: confused car owners do not repair well known hit timid country?
Wu owners and repair shop experienced in dealing with the pain later, said: "The repair shop mentioned on the headache, how can I do?"
Expert doubts
In the repair, be sure to first adjust their attitude, generally had problems in the car, the more or less affect their emotions, with unhealthy emotions affect your sense, especially repair . In addition, repair, be sure to open the car of their own state of understanding of basic techniques, such as adding what grade of fuel oil, what grade oil, antifreeze, and what grades their driving and vehicle characteristics.
4 strokes: be prepared for the day can not get car owners to wonder how can I do?
Miss Gu owner said she recently drove to the repair, but can not repair that failure to resolve the day, you need to leave the car factory, which makes Miss Gu nervous, car is their "lifeline" on the repair shop, his see, my heart is not practical.
Expert doubts
The best repair shop owners along with the factory when the vehicle mileage, fuel gauge pointer approximate location of the vehicle the appearance of the situation, spare tire and tools for confirmation, records
Mr. Liu, the owner of the car just after the warranty period there have been some unexpected small problems, which makes him very upset, what should be where to repair it? Shop cheap, big shops expensive. To save money it wanted to shop, but also worried that "no good cheap goods", to a large store it, and do not want to spend more money.
This can be done?
Expert doubts
Repair be sure to choose a reliable repair workshop, key indicators include a reliable quality (technical level, quality of service), price, size (reliability, service, quality assurance cycle), claims, etc.
General maintenance of large-scale plant is no room for bargaining, we often say Diandaqike: a big yard, big momentum. Although the factory does not mean that all aspects of great good, but at least on the scale and technical strength, there is a certain protection. And although the price is very cheap roadside shop, once the problems are often very difficult to solve.
Therefore, to choose a regular or car repair shop, although charges are a little more than roadside shop, but it charges it will give a little more vehicle owners are very safe, long-term commitment to quality, this is a very bargain thing.
2 strokes: distant past attack owners wondering booking service, OK?
Owner Mr. Wang said that he was particularly busy, like to book repair, do not know Can you do the other will not be any problems?
Expert doubts
Telephone and online booking service will not only save time to repair, but also the first customer.
Appointment in the maintenance operation and maintenance of plant, be sure to cars failures is described as detailed as possible, clear, plant maintenance technicians in order to obtain guidance. Plant operations and maintenance through personnel exchanges, we can find not only the quality of maintenance plant employees, and plant maintenance technicians can learn the technical level: a good service technicians to ask fault conditions, should take the trouble, very detailed, Because the only way to help determine the cause of failure. Conversely, half-hearted rush end communication, the accuracy of the failure process is doubtful.
TIP 3: confused car owners do not repair well known hit timid country?
Wu owners and repair shop experienced in dealing with the pain later, said: "The repair shop mentioned on the headache, how can I do?"
Expert doubts
In the repair, be sure to first adjust their attitude, generally had problems in the car, the more or less affect their emotions, with unhealthy emotions affect your sense, especially repair . In addition, repair, be sure to open the car of their own state of understanding of basic techniques, such as adding what grade of fuel oil, what grade oil, antifreeze, and what grades their driving and vehicle characteristics.
4 strokes: be prepared for the day can not get car owners to wonder how can I do?
Miss Gu owner said she recently drove to the repair, but can not repair that failure to resolve the day, you need to leave the car factory, which makes Miss Gu nervous, car is their "lifeline" on the repair shop, his see, my heart is not practical.
Expert doubts
The best repair shop owners along with the factory when the vehicle mileage, fuel gauge pointer approximate location of the vehicle the appearance of the situation, spare tire and tools for confirmation, records
Manual transmission car jump file failure
Manual transmission car jump file failure Transmission jump file failure phenomenon: the car is moving the shift lever automatically jump back to the neutral position. This phenomenon occurred in the high-speed, sudden changes in load or vehicle subject to severe vibration, and most are in high gear jump file.
Transmission jump file causes for the failure:
l, as gear, gear synchronizer cone sets or excessive tooth wear, tooth length along the direction of the formation of shape, when they produce a mating axial thrust, but also by vibration at work, shaking, speed changes the inertia effect, forcing the engagement of gear torn off along the axis;
2, the transmission and bending, wear and tear over very, screw loosening or deformation of the shift lever, so the gear does not engage;
3, self-locking device worn Songkuang, less elastic or spring break, resulting in lack of strength lock, so that speed can not be reliably cross-axis positioning;
4 sets of gear tooth wear off or even along the length direction of the ground into a conical teeth;
5, shaft and bearings badly worn, the axial clearance is too large, or the first and second shaft and intermediate shaft is not parallel to the meshing gear does not jump up and down swings caused by file;
6 tooth spline shaft and sliding gear splines worn off even;
7, the second shaft spline tooth wear distorted or key transition, caused by loose nut or shaft drive gear before and after the channeling;
8, synchronizer latch loose, fall apart or synchronizer tooth bonding length has serious wear and tear;
9, the transmission is not firmly fixed.
Jump to determine the transmission failure and exclusion file:
l, find a file in the jump file, the file will shift lever substitutions, then remove the cover to see the transmission gear mesh, such as meshing well, check the transmission cross shaft lock mechanism;
2, hand to promote the jump test file transmission fork positioning device, such as poor positioning, the need to remove the transmission cross-axis positioning of the ball and spring testing, such as the spring is too soft or broken should be replaced. If the transmission cross shaft groove wear and tear should be repaired or replaced even before;
3, check the gears meshing, such as the gear is not fully engaged, the gear by hand to promote the jump file or set of teeth meshing correctly, you should check whether the shift fork bent or worn over very well shift fork screws are loose, the fork end and gear cast slot gap is too large. If the speed should be corrected fork bending; as a result of wear and sliding speed gear fork bottom slot over Songkuang repair should be removed;
4, such as variable speed well, and can set the proper gear or gear teeth, gear should be checked for wear into a cone, such as badly worn should be replaced;
5, check the bearing and shaft wear, severe wear and tear such as shaft, bearings Songkuang or speed axial movement along the axis, should be removed to repair or replace;
6, check the synchronizer work, if any fault should be repaired or replaced;
7, check the transmission mounting bolts, such as loose should be tightened.
Transmission jump file causes for the failure:
l, as gear, gear synchronizer cone sets or excessive tooth wear, tooth length along the direction of the formation of shape, when they produce a mating axial thrust, but also by vibration at work, shaking, speed changes the inertia effect, forcing the engagement of gear torn off along the axis;
2, the transmission and bending, wear and tear over very, screw loosening or deformation of the shift lever, so the gear does not engage;
3, self-locking device worn Songkuang, less elastic or spring break, resulting in lack of strength lock, so that speed can not be reliably cross-axis positioning;
4 sets of gear tooth wear off or even along the length direction of the ground into a conical teeth;
5, shaft and bearings badly worn, the axial clearance is too large, or the first and second shaft and intermediate shaft is not parallel to the meshing gear does not jump up and down swings caused by file;
6 tooth spline shaft and sliding gear splines worn off even;
7, the second shaft spline tooth wear distorted or key transition, caused by loose nut or shaft drive gear before and after the channeling;
8, synchronizer latch loose, fall apart or synchronizer tooth bonding length has serious wear and tear;
9, the transmission is not firmly fixed.
Jump to determine the transmission failure and exclusion file:
l, find a file in the jump file, the file will shift lever substitutions, then remove the cover to see the transmission gear mesh, such as meshing well, check the transmission cross shaft lock mechanism;
2, hand to promote the jump test file transmission fork positioning device, such as poor positioning, the need to remove the transmission cross-axis positioning of the ball and spring testing, such as the spring is too soft or broken should be replaced. If the transmission cross shaft groove wear and tear should be repaired or replaced even before;
3, check the gears meshing, such as the gear is not fully engaged, the gear by hand to promote the jump file or set of teeth meshing correctly, you should check whether the shift fork bent or worn over very well shift fork screws are loose, the fork end and gear cast slot gap is too large. If the speed should be corrected fork bending; as a result of wear and sliding speed gear fork bottom slot over Songkuang repair should be removed;
4, such as variable speed well, and can set the proper gear or gear teeth, gear should be checked for wear into a cone, such as badly worn should be replaced;
5, check the bearing and shaft wear, severe wear and tear such as shaft, bearings Songkuang or speed axial movement along the axis, should be removed to repair or replace;
6, check the synchronizer work, if any fault should be repaired or replaced;
7, check the transmission mounting bolts, such as loose should be tightened.
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