The Toyota Camry AFS fault lights

A GAC Toyota Camry sedan. Customers OBD2 reflect the the AFS fault on the vehicle instrument lights, come to my shop to check. Vehicles into the plant, technicians start the engine, lit AFS fault is not found. By asking customers, lit the lamp on the night before, and later went out. IT-II, the technicians check the fault code B2412 historical fault code (see Figure 1) in the control unit.

Fault diagnosis: fault code B2412 the headlight rotary obd2 china motor failure or wiring open circuit / short circuit. When the rotating electric machine after receiving a signal from the AFS ECU starts running, and transmits that signal of headlamps direction and headlight rotation state of the motor to AFS ECU. Technicians determine the fault, the first IT-II active testing to confirm that the left front headlight rotary motor work, the results of diagnostic motor does not work. Since the motor is not working we have to first check the lines, check the ECU-IG2 and H-LP LVL fuse normal, normal motor power circuit. Remove the headlight, disconnect the A66 headlamp assembly connector, check the plug resistance is normal, grounded and normal.

Will AFS ECU failure? Disconnect car diagnostic tool the the AFS ECU connector, A61-1-A61-23 terminal resistor and power supply IT-II examination were normal. The fault checking this direct replacement headlight assembly in accordance with the maintenance manual requirements. The external Check all normal, we only open the back cover of the headlight shell ready to replace the headlights, but then found abnormal, normal headlight plug packed position into linear, and the plug the wrong place, such as the Figure 2. Plug stuck in the side of the hand and a pull out, the first impression is that this bulb is not installed, remove the bulb ready to reassemble the trial, but how loaded is not in place, borrowed from the warehouse of a new bulb, contrast learned (as shown in Figure 3), this bulb of the lamp is not original, the bulb fixed foot position and the original does not like causing how loaded plug position is not right. Are factory fitted bulbs, 3 days after the return visit, customers troubleshooting.

When you turn on obd2 scanner the headlights, rotate the motor self-test, plug the wrong place, causing the rotation when the card issuer. Cause a malfunction lamp is lit. Customer later said the truth, lights, check a few days ago in my shop, my shop is recommended to replace the lamp, too expensive to go out to the market installed a did not think a light bulb cause malfunction lights, but fortunately no cause Shigehito accident . Towel in the actual repair work, lack of attention to some of the details and cause failure, though not occur in the shop, but this situation we can learn from.

Knowledge of car maintenance - car wiper how to check on a regular basis?

Regular obd2 china inspection of the wiper
Recently, a friend of mine drove back from the suburban Chengdu, the middle of it began to rain, rain mixed with dust on the windshield was a big mess, resulting in blurred vision. So hurry to open the wiper, who knows that looks quite new imported cars, wiper whirring ringing is scraping clean. Asked about the matter, the friend said he rarely pay attention to when the car wash wiper strip. , I want to remind motorists friends, do not let the wiper strip into traffic hazards threaten the safety of you and your car.

Well, wiper OBD2 strip how to care for it?
First of all, the car wash, do not forget the wiper. Wiper resting on the windshield, but routine maintenance people very easy to turn a blind eye to problems, etc. were using before. The wiper blade maintenance method is actually very simple. In addition to cleaning windows for each car wash, it is best to use glass cleaning solution to wipe wiper strip so that the the wiper strip of life on longer. If you do it by car wash shop clean, remind the clerk to do the work for you, the wiper switch is placed in the position of the various speeds, check different obd2 code reader speed wiper to maintain a certain speed. There is, check the status of the wiper and wiper strut swing uneven or missing scratch. These two failures of any kind, mean wiper blades damaged. Also, pay attention Wiper vibration and abnormal noise at work.

Second, regular inspection essential. If various complete failure phenomena, will certainly want to check the wiper blades. The method is to pull up the wiper fingers touch the cleaned rubber wiper blades, check for damage, and the elasticity of the rubber blade how. If the leaf aging, hardening, cracks, and it should be replaced. Replacement blades is not complicated, you can do it yourself. The first figure out your car with what specifications wiper blades, can refer to the vehicle manual. If confused, car diagnostic tool can help identify the parts store clerk. Also, pay attention to strut connected to the wiper arm of the match, because some arm screws on the rocker, while others are built point convex buckle lock, buy be sure to look.

Install wiper blades only need a very simple tool, a Phillips screwdriver has enough, if raised, even a screwdriver can be without. Replacement blades: wiper rocker arm pull up, remove the screws (convex button, just press convex buckle), the lifting of the lock. To pay attention to convex buckle dirt Ningzhu, if there is, it is best to use some lubricant spray, in order to disassemble. Either arm, remove after had to be careful, do not let the rocker arm bounced obd2 scanner back to the glass, to avoid damage to the windshield.

Audi A6 engine idling easy to turn off

An Audi A6 auto scanner sedan, in the process of moving, low, normal, high-speed work, but releases the accelerator pedal the engine into the idling condition, the engine sometimes stall.

The fault diagnosis: Chengxiu car first validation failure phenomenon. Start the engine, the engine idle speed is obviously unstable, and is accompanied by serious jitter. This phenomenon may be the engine at idle when the concentration of the mixture or ignition of the problem, or the existence of a purely mechanical failure, cylinder wear, valve closed lax. In summary, the reasons for such failures are generally two possibilities: an electronic control system failure, mechanical system failures.

First VAG1551 detection auto diagnostic tool engine electronic control part, no fault code display. To read the data stream for each of the sensors, actuators, or are within a predetermined range; ignition advance angle are within the normal range, but the engine idle speed of 450 r / min ~ 600 r / min fluctuations. According to the test, you can basically exclude the possibility of failure of the electronic control part, the analysis of other factors that can cause the engine idle speed is easy to turn off: cylinder pressure; valve closed lax; intake system leak; insufficient oil pressure or oil the dirty block; dirty injector plugging or wear; idle speed control valve is blocked by dust or wear; leakage or insufficient ignition energy ignition system; spark plug adverse or failure; fuel evaporative emission control system leak; exhaust gas recirculation (EGR) system bad; jams, etc. of the exhaust gas purifying apparatus.

Measuring the cylinder pressure for each cylinder, at 900 kPa to 1200 kPa, normal; detecting intake manifold vacuum, normal; detecting fuel system pressure, but also normal; clean the fuel supply system and the injector is detected after each cylinder injector the fuel injection quantity, normal; detection of each cylinder ignition, normal; replacing each cylinder spark plug test failure is still the fuel evaporative emission control system to stop working; by blocking fuel vapor channel method to test fault still; blocking EGR the system exhaust Channel to suspend work, found fault disappears, thereby determining the fault of the car by the EGR system failure caused by

The working principle auto code reader of the Audi A6 car EGR system, the engine control unit (ECU) according to the engine speed, the load (i.e., throttle opening degree), the temperature, the intake air amount and the exhaust gas temperature control of the EGR solenoid valve open in a timely manner, intake manifold vacuum degree by the electromagnetic valve into a vacuum film-forming chamber of the EGR valve, the diaphragm Tie the EGR valve open, a small portion of the gas through the EGR valve in the exhaust gas into the intake system, mixed with the gas mixture into the cylinder participate in the combustion, in order to reduce the combustion chamber in the combustion temperature, inhibit the formation of NOx, thereby reducing the content of the exhaust of NOx. However, if the excessive exhaust gas is involved in recycling, will affect the ignition performance of the mixed gas, so as to affect the power of the engine, especially when the engine idling, low speed, low load, or cold machine, the amount of exhaust gas recirculated will seriously affect the the performance of the engine, so when the engine is in the condition above, ECU controlling the exhaust gas does not participate in recycling, to avoid the operation of the engine affected. When the engine exceeds a certain speed, load and temperature, ECU controls a small portion of the waste involved in recycling, and is involved in the displacement of the recirculated according to engine speed, load, temperature and exhaust gas temperature varies, in order to achieve control exhaust the lowest NOx content.

Structure and working principle of the EGR system analysis can be seen, the fault of the car could be the EGR solenoid valve closed lax exhaust uncontrolled been involved into the cylinder combustion, affecting the performance of the mixed gas of fire, causing the engine idling-stop; The EGR valve is closed or lax, the control of the exhaust gas from the EGR valve directly into the cylinder participate in the combustion, the impact of the ignition performance of the gas mixture, resulting in an idling-stop.

By blocking Launch X431 the the vacuum channel between the solenoid valve and the EGR valve, found fault still. Thereby determining the failure is caused due to the EGR valve closed lax. Remove the EGR valve checked and found the valve leakage; decomposition EGR valve inspection found both carbon deposition on the valves and valve seat. Originally coke led to the EGR valve closed lax.

Troubleshooting: auto diagnostic software clean carbon deposits on the EGR valve and valve seat and valve and valve seat with abrasive paste grinding, install retest the car after test does not leak, the engine idle smooth motion releases the accelerator pedal, the engine will not turn off then VAG1551 detection engine idle speed is stable at 800 r / min, the fault is completely excluded.

The car several common fault diagnosis analysis

Speaking of car failure, I believe auto diagnostic software that many consumers will want to automotive failure is a common thing, and what the car has a fault, is the automotive fault really can not conclude that China used to edit this with we talk about, several car owners are often concerned about the failure.

1, car headlights Mifengbuyan
Some time ago, climate auto code reader variability, often heavy rain phenomenon, my car can be considered experiencing ups and downs, and finally God bless, my car had over and over again the crisis did not become a victim of hydrocephalus in the city under the overpass, which is also part of I drive the level of excellent credit. Although the car did not sacrifice in the rain, but the rain this rolling really bring a lot of trouble for me. Just about finished the rain, the headlights of my car is a fine mist of water, and you say this mist inside in the shade and I could not wipe ah! Think of the car now when fog can take advantage of the warm air baking removal, I do not know whether this baking practice also applies to the headlights?

Clinic observations:
Is likely to result in cleaning and when it rains due the lights Mifengbuyan, water, fog will form when larger temperature difference between inside and outside. This time it is best not to high temperature baking, lights quality plastic materials are generally, if the baking temperature is too high, it may cause the headlights appearance softening deformation, affect the use and aesthetics. Further, the lights now generally are monolithic, a transparent lampshade, but also sticky a lamp protection body backplane, high temperature baking can also cause both the adhesion between the glial melting, increasing the car the possibility of water of the lamp. In general, the moisture in the headlights in the daytime sunlight can quickly evaporate your headlights influent phenomenon appears frequently, you should check the lamp body to the service station to see is not due to collisions result lights damaged, resulting in frequent water.

2 car fuel gauge not allowed
I bought the car auto diagnostic tool for some time, and now there is a small problem, does not affect use, but it also made me very inconvenient. This problem out on the table of my oil, its accuracy is absolutely doubtful. The first 1/2 when the pointer down very slowly, over half feel the engine like drinking oil general pointers brush to fall down. Every time I will when the pointer reaches the last white line to refuel, but sometimes 100 oil added pointer rise to the position is not the same. Even have time to fill up the oil, but not the top pointer, how is this going?

Clinic observations:
About the rate of decline in the rate of the fuel gauge pointer is not the same as this phenomenon, it is possible to design problems, Some models fuel gauge itself is not designed in accordance with the linear fashion, the slower of the first half, the second half faster this phenomenon should is relatively normal. The oil table pointer to be unstable, the oil table the oil level sensor may have a problem. If it is confirmed to fill the oil later, did not the table pointer did not reach the peak, oil monitor. These issues to the repair shop maintenance on it.

3, car power windows suddenly down automatically
My car is in the auto scanner high-end models, four electric windows are standard equipment, and have been extremely convenient to use, especially the main driver's side of a key lift design eliminates the site of some of the fees, should always live trouble than my old car electric windows better control button. But Superior thing there are various problems, my main drive side electric window whenever rise to the top, suddenly automatically fall some, made me every time when closing a window, but also carefully control it, to save trouble becomes cumbersome, will control system out of the question it?

Clinic observations:
General limousine Launch X431 on the design of the power windows will install an anti-pinch function, can be avoided personal injury caused by accidental operation. In the use of the process of the vehicle, if the inside of the door top frame inlaid part object, the window rose to this part of the time, the sensor will start to pinch function, so that windows decreased. Further, sometimes in the process of high-speed driving, since the voltage of the reasons of the glass can not be increased smoothly along the rail, can also cause the function of the start of the anti-pinch function. In this case, it is best to authorized service station to look at regulation, to check whether there is a foreign body impact window lift and adjust.

Passat Lingyu driver's side front of the location of abnormal sound

A mileage of auto code reader 110,000 km 2007 Passat 1.8T Volkswagen Passat GLS sedan. Users reflect similar turn signal to turn on the sound in the car driving in front of the driver's side position, and when the time is now hidden.

The examination analysis: the maintenance staff and users with road test, finally heard the faint sound of the user prompts. That such a sound from the instrument sets the bottom left of the relay area, is issued by the repeated action of a relay. Lingyu automatic car configuration of the brake vacuum pump, the engine control unit J220 Upon detecting the insufficient degree of vacuum within the vacuum booster, and will immediately start to brake vacuum pump, in order to maintain a specific degree of vacuum.

In view of this noise auto diagnostic tool, should be a brake vacuum pump relay (Figure 18) J564 (373) issued by the contact action, which indicates that the brake system has the potential problem of air leakage. Detecting an engine control unit, and found that the fault code 17887 ---- brake vacuum pump mechanical failure, incidental. In order to clarify whether the vacuum system is really exist a leakage problem, and viewed a state of mixed gas, and found that long-term fuel correction amount is 9.0%. Considered together with the degree of vacuum, the vacuum system can be seen that there is indeed a leakage problem.

To further clarify, the view in auto scanner the engine idling, the engine control unit 8 Zone 3 data, found that the air in the brake booster pump pressure of 58.5 kPa absolute, is too high. Observe the engine idling state, appears to be very stable, but this is the result of long-term fuel correction enriched.

Carefully checked into the trachea and its surrounding conduit and the check valve, and found that there are two one-way valve leakage (Figure 19), wherein the jet pump at the one-way valve leak vacuum booster vacuum reserve will produce a certain affect

Troubleshooting: 8 Zone 3 data auto diagnostic software after replacing the one-way valve, re-read, the air pressure becomes 17 kPa normal. Road test certificate again, the original relay contacts occur frequently pull sound no longer appeared.

Mercedes Benz S350 engine fault lights

Super car mileage 240000km, auto diagnostic software configure the M272 engine Mercedes-Benz S350 sedan. Reflects the owner: The car engine fault lights.

Pick check the fault light lights, turn on diagnostic DAs are read engine fault code 0278: the right side of the intake camshaft adjustment solenoid valve (Y49 / 5) is shorted to ground, and storage; fault code 1208; along postponed direction continue to adjust the right the cylinder columns intake camshaft, and storage. Clear the fault code, the fault code still exists.

Guide the detection of fault code 0278 progress, activate camshaft adjustment solenoid valve (Y49 / 5), no reaction, possible causes and guide not to mention:

① may camshaft regulating solenoid valve Y49 / 5 are consuming too much damage.
② connected to the camshaft adjustment leads to the solenoid valve (Y49 / 5) eliminate short circuit or grounding.
(3) The engine control unit is damaged or internal short circuits.
④ extend auto diagnostic tool the engine chain or sprocket wear.
Maintenance, fault code 1208 guide columns intake camshaft pulse wheel to replace the right side of the cylinder.

After re-analysis fault code 0278, the first suspect camshaft regulating solenoid valve (Y49 / 5), an internal short circuit, the regulating solenoid valve due to the intake camshaft pulse wheel and the camshaft (Y49 / 5) is active and passive relationship. So replace it with a new camshaft adjustment solenoid valve, but the problem persists. View WIS by the circuit diagram (Figure 1) was informed that pin 1 on the engine control module N3/10 connected to the camshaft adjustment solenoid valve (Y49 / 5) 1 foot. Unplug the wires conduction auto code reader, measured with a multimeter and ground guide through. And four camshaft adjustment solenoid valve (Y49 / 4, Y49 / 5, Y49 / 6, Y49 / 7) shared a node Z7/38 If camshaft adjustment solenoid valve (Y49 / 5) to short-circuit, and there has been 3 camshaft adjustment solenoid valve should have been a short circuit fault, but the fact that the other three do not have this fault. From the above analysis that the engine diagnostic line will not be shorted to ground Secretary may only internal short circuit of the engine control module. Thus, the replacement of the engine diagnostic, programming, commissioning, fault code 0278 disappearance of this troubleshooting. Fault code 1208 is still there, and the replacement of a new engine control module fault code display 1206 (along postponed direction continued to adjust the right side of the cylinder columns intake camshaft). Analysis of the pulse wheel driven by the timing chain, reported this failure, there are two possibilities: first, like the diagnostic prompt blade fiscal sheep, may be the the camshaft pulse wheel damage; timing mechanism balance shaft sprocket wear. According to past experience, the balance the Lin-round wear, diagnostic guide failure will prompt the view cam lin round, but this car is only a guide to view the pulse wheel. So, first replace the right side of the intake camshaft pulse wheel installed commissioning, fault persists. Now only check 4 chain and balance shaft sprocket. Let go of the oil, and disassemble the oil pan and oil pan iron tablets, this point, the question should have been found, these iron particles is most likely due to the balance shaft sprocket wear.

To communicate with the owners of the engine opens, validation the camshaft sprocket indeed wear extremely serious, as shown in Figure 2.

The car after the owner's consent, and related components to replace the balance shaft and sprocket fault light is no longer lit, the engine is running properly, and troubleshooting.

So the array auto scanner summarize: during maintenance, diagnostic boot prompt to enhance analysis, will be detours encounter problems or in conjunction with diagnostic tips and repair experience, comprehensive analysis, from easy to difficult, step-by-step to solve.

How to solve the problem of ignition system and indicator light

FAQs ignition system solution

With the auto code reader use of time, the high-temperature heat in the engine work and normal maintenance norms fold, pulling, bending and other brutal demolition methods may lead to the spark plug internal core wire is removed off itself resistance is greatly increased, so that the high-voltage can not be completely adequate transport the spark plug leaving the spark plug off the fire "or" flash over energy is not enough, can not ignite the combustible mixture, the corresponding cylinder can not do work or does not work properly, serious impact on the output of the engine power.

Defective ignition system is caused by unstable idle, unhappy refueling failure phenomenon, and the culprit is damage to the spark plug, and high-voltage lines. Ordinary spark plugs need to be replaced once every 40000km, the expensive platinum compared to the fire mouth 100000km replacement. When using a deadline auto diagnostic tool to mercilessly must be replaced.

The Accord sedan generator indicator light

A 96 models auto scanner of the Honda Accord sedan, the generator charging indicator light is on the dashboard.

Check analysis, because the car uses eight AC generator, electronic tuning regulator is within. Therefore, first check the fuse generator, intact. Measuring the generator 4 terminal connector on the black / yellow wire voltage is 12V normal charge generator on the white / blue wire grounding, dashboard indicator lights, disconnect the grounding, the direction extinguished.

Thus concluded the normal generator outside line fault location on the built-in generator regulator.
Replace the regulator, Launch X431 and troubleshooting.

The VW Magotan engine fault lamp is lit, power down

A mileage of auto diagnostic tool about 90,000 km in 2009 Volkswagen MAGOTAN 1.8TSI cars. The owners reflects: car engine fault light is lit, power down.

Take the car: maintenance staff detected the engine control unit, found fault code 00257 ---- Air flow measurement value untrustworthy. Clear fault codes posterior test, fault code appears again View freeze frame failure in the vehicle accelerated process. 01-08-32 data set, reading the engine control unit idling into the adaptive value of -5.3, part load into the adaptive value of - 8.6%, indicating that the engine control unit for control of the gas mixture is normal. This ruled out the possibility of failure of the air flow meter, the issue should be out in the pressurization system.

Connection auto code reader failure diagnostic road test the engine's intake air quantity data (Figure 1) was observed when the vehicle is in hard acceleration. The analysis of data found that the sharp increase of the loading rate, the feed rate of the engine but slow growth. In the extreme case, when the engine load rate is maintained at 100%, the intake air quantity after nearly 7s time before it reaches the maximum value. This shows that the efficiency of the air intake of the car engine problems.

Road test again, the low Launch X431 speed of the vehicle suddenly accelerated pedal in the end, while observing the engine control unit 115 3, 4 zone data. The observed growth throttle before the actual air pressure is always higher than the target pressure growth retardation, and the maximum value of the actual pressure can only reach 160 kPa is significantly lower. May speculate that the engine's intake system for leaks.

Carefully check the engine intake conduit, and found that in the cooler to the throttle body conduit oil leakage phenomenon (Fig. 2). After the collapse of the oil clean, found cracks in this pipeline. This finding just explain the causes of the fault codes, because when the higher pressure within the intake pipe, cracks is up to open, so that the air output of the turbocharger wastage, so that the intake air quantity will not be able to reach the engine control unit auto scanner the expected value .

Troubleshooting: Replace the intake manifold, and troubleshooting.

Automotive computer fault repair instance(I)

With the development of modern automotive electronic technology in the automotive air conditioning system, either manually controlled or automatically controlled air-conditioning compressor electromagnetic clutch cut engagement generally achieve computer control.

In the repair process auto diagnostic software of the air conditioning system, a considerable part of the failure to appear on a computer. While in the case of all sensor signals can be input into the computer normally, when the computer can not properly control the compressor electromagnetic clutch separation and bonding, the fault position occurs mostly in a switch from the role of the computer's internal transistor.

To repair a computer, the first to confirm that is certainly a computer failure, so as not to blind repair, causing unnecessary waste of time and cause circuit failure. Computer repair theoretical basis and scientific methods, not recklessly, repaired computer can promise warranty period.

Air conditioning repair most of the computer control part of the fault, in fact, is to replace the computer-related switching transistor. Following Honda Accord 2.2 sedan, for example, to explain the methods and steps of computer repair.

The first step auto scanner is to find the electromagnetic clutch control the connection end of the coil and the computer and the ground terminal of the computer, according to the circuit diagram best found with crayons terminal marked.

The second step is to use digital multimeter measurement-off block, from determining the air-conditioning control terminals, find a little inward along the computer printed circuit until you find a triode or triode row.

The third step auto code reader is to determine triode or triode rows of three pins, computers generally use an NPN transistor, here NPN type, for example. Previous step found in the printed circuit corresponding pin is the transistor collector, corresponding to a smaller next to the printing line is the base of the transistor. Of course, need to be further confirmed what the left one or the right one.

Confirmed as follows: Set the air conditioning operation panel operation in air conditioning and refrigeration state voltage using a multimeter block is connected to a foundation to be confirmed pole cord, turn on the A / C switch, which should show 5V off switch should show 0V. Use this method to test the wires repeatedly confirmed shall comply with the conditions of the base. Recognized emitter, generally if the transistor row which emits significantly more measured with a multimeter off at both ends of the row of the stopper one end connected to a ground terminal of the computer and the other end received is considered to be a grounding end of the row, it is possible to guide through the pin is the transistor emitter. If only auto diagnostic tool one transistor, through the thickness of the printed circuit can be easily identified.

The Volkswagen Bora accelerated less trouble

The Volkswagen Bora auto diagnosis mileage of about 90,000 km, equipped with 01M automatic transmission 2009 Volkswagen Bora cars. Users reflect the car accelerated weakness. Pick-up: the maintenance staff commissioning, and found the car to accelerate slow engine speed increases to more than 3 000 r / min, the transmission to shift into 3 block. This is obviously not normal.

First, check obd2 scanner the engine torque control situation. Through the stall test and found that only 1 700 r / min, the stall speed of the engine is significantly lower. Detecting an engine control unit, the fault code. But check fuel correction amount, partial concentration of the mixture in the fuel injection correction. Engine idling view 01-08-005 set of data, air flow rate of 4.2 g / s, calculate the air flow parameters, flow rate of only 2.3 g / s. Since the air flowmeter measurement of the intake airflow in high error exists, so when the engine obd2 scan tool output torque is increased, the fuel injection quantity is beyond the correction range, so that the mixture is too thick and cause engine overload. In the case of high rate of engine load, the transmission had to be postponed shift, this is a trial run to see the failure phenomenon.

Troubleshooting: Replacing obd2 code reader the air flow meter, troubleshooting.