Torque converter failures because of traffic jitter – torque converter, jitter –
For automatic equipment Transmission Of the vehicle, locking clutch failure on the vehicle will have a great impact. The common fault with the clutch lock: Lock the clutch can not be joint, not separation, bonding and spin so bad. The failure phenomenon varied, so grasp the working principle, characteristics and analysis of failure is very important. Service Officers have been to a Ford Wind Star 1996 models cars. When the vehicle, the high speed of vehicles produced jitter, gives the engine feels like jitter and committed the same seat. According to car speakers this fault has been repaired many other repair shop, engine replacement parts on a lot, but the failure did not improve the situation a bit.
First to road test the vehicle in the 40-80km / h no pattern of occurrence between the jitter. First tested on the engine, but found fault. Consider at this time may be other factors. Then connect the computer Detector Read the data stream, found that when locking clutch (TCC) bonding, especially when they take Taiwan to the 40% -60% of the time, the vehicle will appear chattering. Thus determine the bad fault is caused by the combination of TCC. But which part of node sets bad turn, caused it? Point of failure may lie in electrical control, hydraulic and mechanical systems which part. Of course, there are special circumstances, such as when the throttle closed, the imposition Brake , Emergent accelerant, or rapid deceleration, shifting, oil temperature lower than 60 temperature is too high and help block the following gear in 3 and so on, as they lock when the clutch is not bonding.
Locking clutch engagement and separation from the computer (PCM) through the locking clutch (TCC) solenoid to control rooms. Computer according to throttle position Sensor , Speed sensor, turbine shaft sensor, gear, gear shift and brake switch time signal analysis, to the TCC solenoid valve to provide duty cycle signal, change the TCC solenoid valve opening to control the clutch action. For the TCC's work, the computer is through the engine speed and the turbine shaft (input shaft) for monitoring the speed difference. When the lock does not work the clutch, the engine speed to be greater than the turbine shaft speed 200-300r/min; the lock clutch engagement process, the difference between the speed should be gradually reduced; when locking clutch is fully engaged, the two The speed difference should be almost zero. Thus, we can observe the engine speed and turbine speed (input shaft speed) to determine the difference between the state and clutch work good or bad. Lock in determining the number of clutch engagement can not be separated or not failure, can also be connected to the transmission detector (a solenoid valve can control the work of the inspection tools), disconnect the computer on the transmission of control, people control the clutch solenoid valve work to determine the control part of the fault, or the operative part of the fault. If the artificial control of the work of the clutch solenoid valve failure is still there, indicating no problem with electronic control part. If the fault lies in the electronic control section, the impact of the TCC should first check the work of the various sensors signal is normal, then check whether the PCM signal by the sensor to work properly, the final check wire connection is good.
On the hydraulic part of the fault, can be judged by measuring the oil pressure to. So this car was the transmission oil pressure test. Road test, the jitter appears in the TCC engagement and did not find the volatility of oil pressure and abnormal. To further determine the existence of this transmission failure of hydraulic parts, and installed under the valve off to test the template, using compressed air for testing. The results showed that the TCC and the hydraulic valve body manifold works well, the hydraulic part of the fault may be the basic rule out the possibility.
As for the mechanical part, unable to disassemble, so only by the exclusion of other aspects of the failure to identify. Areas through the detection and analysis, maintenance personnel may determine the fault lies in the mechanical part only, namely the torque converter clutch lock.
Here to remind the general maintenance personnel, as unable to disassemble the torque converter, it should be noted in the maintenance of transmission, torque converter when the cleaning problems and prevent entry of foreign matter and damaged torque converter clutch lock. For oil drain plug in the converter, when the discovery of oil has changed when the oil drain plug should be open, flush with new oil repeatedly; to not put the oil plug converter, you can use high-pressure air cleaning methods inverted.
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