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Troubleshooting of Driving Jitter of BMW 523Li Car

Publié le 16/03/2018 à 12:47,
Mots clefs :


The 2008 BMW E60 523Li sedan with a mileage of over 226,000 km and a 6HP-21 transmission. The vehicle's small throttle 2 to 3 engine speed VAS 6154 when the 1800 ~ 2000r/min, 20-30km / h when the car shakes, in the four-speed engine speed at 2200r/min, 50km / h or so when the occasional continuous jitter, Like a small, very small continuous deceleration belt, it is not shaken (feeling that the lock-up clutch in the torque converter is not working well), and the large throttle 1-6 stops the engine from 1000 to 3000 r/min without jitter phenomenon.

Fault diagnosis: back to the factory with Jinde KT600 decoder to read the fault code, the engine system is normal, the transmission cgdi prog system is normal, the road test reads the data flow is mainly read the torque converter lock case, found in the second gear when the torque converter The lock-up clutch display has been adjusted. At this time, the vehicle speed starts to fluctuate slightly from about 20km/h. When the data display is off, the car is normal. When the speed is 40km/h, the 3rd gear is changed and the data is displayed. At this moment, the car started to shake again, shake a few times, the data showed that it was closed, and the car immediately returned to normal. When the data show that the car has x300dp pad been adjusted to shake, show that the car has been closed to normal, when the throttle is almost 1000 ~ 3000r/min data shows that the car has been closed, the car is normal, which is more sure of the problem is the torque change point The lock is not good.

Troubleshooting: The problem is solved after replacing the torque converter.

Fault summary: personally think that this problem is the torque converter inside the friction plate and the lock plate work surface uneven or deformed, resulting in a combination of locking work is not true, resulting in this situation, when the high Xhorse ELV Emulator throttle engine speed high torque Larger, so the high oil pressure lock-up clutch is now firmly integrated. It has not waited until the pressure of the lockup clutch starts to jitter and enters the next gear, and then the lock-up clutch is started again. This way, if the throttle oil pressure is high, it will not be given. There is a problem with the lockup clutch, so there is no problem.

Safe deposit hidden danger Mercedes-Benz A grade and S grade recall

Publié le 9/03/2018 à 12:24,
Mots clefs :


Mercedes-Benz Automobile Sales Co., Ltd. has filed a recall plan with the AQSIQ. From March 8, 2018, it will recall cgdi mb some imported A and S grades. According to statistics of the company, a total of 93 vehicles were involved in the mainland. details as follows:

  Recall models (1)

       From May 24, 2017 to May 25, 2017, some of the imported 2017 A models will be produced, a total of 4 vehicles;

       Recall reason

       Due to production reasons, the bonding of the lower area of ​​the front windshield cannot meet the specification requirements. In sbb2 key programmer some cases, the front windshield may be separated from the body in the affected area. The front windshield that is partially separated from the body may not be able to support the activated airbag as expected, posing a safety hazard.

       Remedy: Mercedes-Benz Automotive Sales Co., Ltd. will check the front windshield adhesion on the affected vehicle for free and replace the windshield if necessary to eliminate defects.

       Recall models (2)

       From the period of October 31st, 2013 to January 25th, 2017, a part of imported S-class 2013-2017 models, a total of 89 vehicles were imported.

       Recall reason: Due to suppliers' manufacturing reasons, the durability of the transistors in the steering assist system control unit does not meet the requirements, and may break due to vibration and temperature changes during the renault can clip operation of the vehicle, affecting the cooling effect of the transistor. If the temperature of the transistor is high, it will affect the function of the steering assist system and there is a safety hazard.

       Remedy: Mercedes-Benz Automobile Sales Co., Ltd. will carry out inspections for the affected vehicles free of charge and replace the steering gear if necessary to eliminate defects.


Audi reverse gear slow reaction gearbox repair

Publié le 26/02/2018 à 12:23,
Mots clefs :


A 2005 FAW Audi sedan, the car equipped with 2.4L engine while matching 01J-type chain drive CVT. Symptoms: During normal super DSPIII plus driving speed in the 30 ~ 80km / h speed constant speed constant throttle drive, the vehicle has a slight towering phenomenon, overhaul found that the inverted block unresponsive, if not properly handled there will be a serious impact phenomenon.

Fault diagnosis: the vehicle just entered the factory just complained about the process of driving the vehicle which is very uncomfortable, originally thought it was the engine ignition or fuel system problems, after maintenance found that the engine works SEC-E9 CNC everything is normal without any problem, so the user described the uncomfortable should Related to transmission or chassis drive system components. The technician test found that the user described the uncomfortable phenomenon, in fact, the vehicle within the prescribed speed range constant throttle (throttle) to accelerate driving should be reflected in the transmission. Check the drive shaft, ball cage, ABS, etc. were found no problems, so determine the fault phenomenon comes from the transmission system. Since the transmission system has neither fault code nor data flow and no problems with the data flow and the fact that the transmission is not serviced for a long time, the result should be tried out first by the user's wish to change oil.

In the process of dynamic oil change, the technician not only found that the oil color is dark yellow, but also found through the window with the LED lamp there are fine metal particles in the oil. Therefore, it is suggested to terminate the oil change vvdi key tool renew adapters process, indicating that the transmission has metal parts worn inside , But users still insist on the first oil to try again. After completing the entire dynamic oil change (as shown in Figure 1), the external pressure filter of the transmission was replaced and the road test was carried out after the fuel level was re-established, with a slight but no significant reduction Off the oil off the same fire). In this way the user decided to use it for a period of time to see if the symptom can be alleviated in the subsequent use.


Toyota Corolla car engine can not start

Publié le 23/02/2018 à 11:33,
Mots clefs :

A driving range of about 130,000 km, the model for the ASU40L, equipped with 1AR engine 2010 Toyota Gaslamp Highlander sport utility vehicle. Users reflect: The car made in the block, the transmission will be issued "magnetic, magnetic" sound.

    Inspection and Analysis: Maintenance car fans c800 personnel test found that when the shift lever from P to N block, the transmission will be issued abnormal sound, but the road test found that the transmission gear shift normal. Further test found that if the shift lever back and forth in the P, N block toggle, the sound becomes a continuous sound.

    Remove the working oil pressure test plug on the right side of the transmission and connect the hydraulic gauge. Start the engine to preheat the carkeydeals transmission and set the diagnostic meter to the active test state. After the transmission oil temperature reaches the normal temperature, perform the test of the oil pressure regulating solenoid valve S LT. When the solenoid valve is working, the working oil pressure reaches the standard oil pressure when the transmission is no-load. After the solenoid valve is closed, the working oil pressure reaches the maximum value and meets the standard. This will eliminate the hydraulic control problems.
    After the vehicle is lifted to simulate the driving status of the road, and the active test function of the diagnostic instrument is used to control the shift process of the transmission, it is found that the shift of each gear is normal. The vehicle speed increased to 65 km / h, with the diagnostic instructor torque converter lock-up clutch, and then light on the accelerator pedal, you can feel no significant changes in engine speed, lock function normally.

    According to the sound characteristics of abnormal sound judgments, it may come from linear pressure regulating solenoid valve. So xhorse key cutting machine through the diagnostic instrument one by one off the linear solenoid valve, when closed to lock the oil pressure regulating solenoid valve SLU, the sound disappeared immediately.

    Remove the oil pan to find the SLU solenoid valve, the vehicle maintenance staff to open the ignition switch, and then the shift lever from the cadaver to N block, then the solenoid valve issued a "magnetic" sound. Touching the surface of the solenoid valve by hand can feel the temperature significantly higher than other solenoid valves. Remove the solenoid valve, until the temperature cooled to 20'c after measuring the coil resistance, resistance is 12.6Ω, higher than the normal resistance, indicating that the coil has been burned out.


Honda Fengfan fog lights do not light the central locking failure

Publié le 2/02/2018 à 05:54,
Mots clefs :

After a Honda Feng Fan car repair is completed, the final test test found two failures: one is the front fog lamp does not shine; the second is to close the driver's door, the left rear and right front and car key programmer rear door lock motor back and forth continuously beating two or three times. Operation of the left front door manual locking switch, the other three door lock no response, no abnormal indicator light on the instrument, the dome light is normal, the remote control switch is normal.

Fault diagnosis: First, maintenance personnel with reference to the circuit diagram, a comprehensive inspection autel ms908p of the above failure, but for some time the fault has not been ruled out, and diagnostic ideas into the wrong.

The misunderstanding is that maintenance personnel focus the fault on the G1 front fog lamp relay, always suspecting that the relay has failed, but the fault persists even after switching to a new one. Maintenance personnel also suspect that the line between S1 and S2 appeared open circuit phenomenon, so the short circuit S1, S2 after the fog lights, indicating that the line between S1 and S2 normal access.

Failure Summary: Do not blindly test before troubleshooting, but do not blindly to damage the line, such as cut off the broken skin, chaos take the line, because there are many lines of signal sharing path, especially in many high-end car CAN BUS signal.

To carefully study the circuit diagram, analyze the working principle of the system, analyze possible points of failure, to find a breakthrough in failure. Now the car circuit has a lot of line color and plug ecu programmer are the same general, in the dismantling of electrical appliances, to properly mark, reduce a lot of trouble, do not see the plug on the chaotic connection, this is the circuit repair taboo.


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