Anti-lock braking system ABS can be installed on any car with hydraulic brakes. It is the use of the valve body of a rubber balloon, when put on the brakes, giving the brake oil pressure, flooded to the ABS valve, when the airbag use compartment in the middle of the air pressure to return, so to avoid wheel lock dead center. When the wheel is about to reach a dead lock, brake oil pressure the effects of repeated balloon, under the OBD Diagnostic Tool check, found in a matter of seconds can be 60 ~ 120 times, in does not stop brake, relax. ABS is composed of wheel speed sensor, engine speed sensor, solenoid valve, computer and hydraulic control unit (hydraulic regulator), and its characteristics are as follows four:

1, ABS with excellent performance and self diagnostic capabilities, you can rest assured that use. In addition, the use of ABS and the common brake system using almost the same, braking to foot on the brake plate normal braking can be, ABS will own the brake hold at the optimal point.

2, the car brakes, the braking force of the four wheels are different, if the car's front wheels to lock, the driver can not control the direction of travel of the car, prone to risk of a collision, if the first locking the rear wheels, can appear the skidding, tail flick, if installation of ABS, can avoid four wheel is locked, Launch X-431 PAD or Launch X431 GDS tool can detect ABS data, the ABS system improve the stability of the vehicle in the braking process;

3, compared with the conventional braking system, under the state of emergency braking, ABS can make the wheel in both rolling and drag, which greatly increases the tire and the ground friction and shorten the braking distance, namely the so-called optimal braking point or region, while the ordinary brake system is unable to do this;

4, It is proved that the wheel fully locked will cause tire cup type wear, make the uneven abrasion on the tire surface, thereby increasing the tire wear and tear.

Thus, ABS anti-lock system, can avoid the braking when the direction is out of control and wheel sideslip, make the wheel when the brakes are not locked, don't let the tire friction with the ground at one point, so as to increase the friction, in the Autel MaxiSys MS908 or Xtool PS2 tool checks found, ABS system makes the brake efficiency of 90% or more, while reducing brake consumption and extend brake drum, disc and double the life of the tire. Vehicles equipped with ABS in dry blacktop, rain, snow, skid resistance reached 80% - 90%, 30%, 10%, 15% - 20%.

Source: http://www.focalobd.com/blog/anti-lock-braking-system-abs-function-introduction/

Posted by: obdtools at 03:45 AM | No Comments | Add Comment
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Fuel filter is contained in the fuel in the iron oxide, dust and other solid impurities removed, to prevent clogging of the fuel system, reduce mechanical wear and ensure stable operation of the engine, and improve reliability. Fuel filter is a fine part, in use for some time, use the Auto Diagnostic Tool to check the fuel filter performance, if the fault code is 00538, need to replace the fuel filter. Method is as follows:

First, loosen the clamping device at the junction of the oil and fuel filter, then removed fuel filter from the oil passage, followed by a stopper oil passage, so you can prevent fuel spillage. Most of the oil installation in the fuel filter is marked with two arrows, one is the fuel flowing into the arrow, and the other is the fuel outflow arrows, with arrows to indicate the flow of fuel through the fuel filter when. So when we installed the fuel filter, be sure to make the arrow pointing the direction of the engine, that the engine oil is flowing.

In addition, it should be noted that the clamping device in the circuit used is specially designed, rubber hoses and fuel filter in the junction of these two components tightly clamped to achieve sealing effect. Compared with the ordinary clamping device, this device does not cut into the rubber hose, and therefore does not cause damage to the rubber hose, and this clamping device can withstand high oil pressure. In contrast, the ordinary worm type clamping device more easily damage rubber hose caused fuel leakage. Finally, we should also ensure that the rubber hose clamp device is installed in the correct position and in accordance with the specified specifications of the clamping joint.

If the vehicle is without the need to maintain the fuel system, and only use a built-in to the fuel filter, then in vehicle periodic preventive maintenance process, it is not possible to the oil pump, a filter and a fuel output device all replaced, even automotive preventive maintenance interval is long, it is impossible to do that, because of the high cost of doing. But if you use Launch X431 V+ Pro3 or Launch X431 Diagun III tools to check the. It is found that the anomaly of the working performance of the engine, the fuel pressure and fuel system in the critical value, replace the fuel filter placed inside the tank is very necessary.

When using this lute-shaped coupling member also noted that during the installation process must not make the wrong buckle connecting thread situation appears, it should not be applied in large part on the binding of clamping force. Do not use RTV or other types of seals on these lute-shaped coupling member. When installing the coupling member, use wrench to ensure proper clamping force.

After completion of maintenance work on the fuel filter, put all the parts are assembled, replace the fuel pump fuse, and then, in the case of the ignition system does not work, the engine is rotated several turns, until the establishment of the fuel system far from normal when the fuel pressure. At this point, you should check the fuel filter and oil line for leaks. If Autel MaxiScan JP701 or Autel MaxiDas DS708 tool test results show that everything is normal, start the engine run a few minutes, and then re-check again to make sure there are no leaks happen.

Source: http://www.focalobd.com/blog/how-to-correct-replace-fuel-filter/

Posted by: obdtools at 06:21 AM | No Comments | Add Comment
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Audi A6 car engine operation of the exhaust pipe a small amount of black smoke emitted, exhaust gas is faulty. After testing, the engine power was normal. OBD Diagnostic Tool connector perform self-diagnosis, the engine system has a fault code, reads "00561, mixture adjustment exceeds the limit." Executive DTC Clear function, the fault code is cleared. Fault analysis, there may be poor oxygen sensor performance. View the data flow (functional path 01-08-007), the idle mode of the 007 data block 1 zone data (mixed gas formation control value) for -25%, 2 District data (oxygen sensor signal voltage) of 0 809V. Under normal circumstances, the mixture formation control value should be within the range of -10%, 10%, and the fluctuation of the mixture of the mixture is slightly fluctuation with the fuel injection quantity.. -25% data shows that the engine control module attempts to reduce fuel injection, in order to control the concentration of mixture in normal range. The signal voltage of the oxygen sensor is 0 809V, partial rich mixture, in conformity with the fault phenomena of the smoke.

By the principle of fuel injection, the engine control module mainly according to engine speed signal, air flow sensor signal to determine the basic fuel injection quantity, use the Launch X-431 PAD or Launch X431 GDS tool to check air flow sensor. Select the feature path 01-08-002, view the air flow sensor data (4 area data). The air flow at idle speed is about 7.5 kg/s, which is obviously larger than the normal 2 0kg/s -4... The 2 zone data is the theory injection time (crankshaft to a circle), the 3 zone data for the engine a working cycle of injection time (actual injection time). The actual injection time is on the basis of theory of injection time correction of, should be twice fuel injection time and the car of the two injection time almost the same it proves that the theory of injection time is too long, after correction of the actual injection time shorter. When the fuel injection time correction exceed the limit, the failure code will occur 00561. The result of the above detection is that the cause of the fault is the air flow sensor signal is too big 6 replacement air flow sensor, the fault completely ruled out.

Since the air flow sensor signal in the car idling just too high, and in the part-load conditions and acceleration conditions are normal, and therefore less impact on the overall condition of the engine, fuel consumption is not significantly increased. In addition, by Autel MaxiSys Pro MS908P or Xtool PS2 dynamic data analysis process it can be seen, although the engine control module based on the oxygen sensor signal identification to the mixture is too thick, but no corresponding reduction in the fuel injection quantity so that the concentration of the mixture back to normal, the reason is, fuel injection depending on the amount of engine intake air, engine speed, oxygen sensor signal is only a feedback signal as a mixed gas under closed-loop control mode, the fuel injection quantity correction within a certain range.

Source: http://www.focalobd.com/blog/audi-a6-car-exhaust-pipe-black-smoke/

Posted by: obdtools at 03:07 AM | No Comments | Add Comment
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