1.通過試車確定故障的大致方向

1. Determine the approximate direction of the fault through a test drive

(1)如果油門加得越慢，沖擊越大，這種情況顯然不符合換擋控制邏輯，因此故障原因在信號方面，需要重點檢查節氣門位置信號和車速信號。

(1) If the throttle is applied slowly and the impact is greater, this situation obviously does not conform to the shift control logic. Therefore, the cause of the fault lies in the signal aspect, and it is necessary to focus on checking the throttle position signal and vehicle speed signal.

(2)如果每個擋都沖擊，故障原因就在公共部分，包括油泵、閥體、主油路調節閥、節氣門傳感器、車速傳感器以及控制模塊。

(2) If every gear is impacted, the cause of the malfunction lies in the common parts, including the oil pump, valve body, main oil regulating valve, throttle sensor, vehicle speed sensor, and control module.

(3)如果只是個別擋沖擊，故障原因應該在與該擋相關的部件上。

(3) If it is only an individual gear impact, the cause of the fault should be related to the components associated with that gear.

2.查詢故障碼和讀取數據流

2. Query fault codes and read data streams

一輛2010款北京現代悅動汽車，行駛里程26000km，在行駛中自動變速器出現沖擊現象，發動機故障指示燈(它與變速器故障指示燈合二為一)點亮。連接故障診斷儀，查詢到變速器控制單元存儲有故障碼P0743，含義為DCC電磁閥對地斷路，數據流顯示變速器鎖定在三擋。給DCC電磁閥通電試驗，沒有工作的聲音，給其他4個電磁閥通電都工作正常，說明DCC電磁閥已經損壞。

A 2010 Beijing Hyundai Yuedong car with a mileage of 26000km experienced an automatic transmission shock during driving, and the engine malfunction indicator light (which is combined with the transmission malfunction indicator light) lit up. Connect the fault diagnosis instrument and check that there is a fault code P0743 stored in the transmission control unit, which means that the DCC solenoid valve is open to ground, and the data flow shows that the transmission is locked in third gear. When conducting a power test on the DCC solenoid valve, there was no sound of operation. However, when the other four solenoid valves were powered on and worked normally, it indicates that the DCC solenoid valve has been damaged.

自動變速箱維修

Automatic transmission maintenance

3.檢查變速器油壓是否過高或過低

3. Check if the transmission oil pressure is too high or too low

自動變速器換擋沖擊的一個常見原因是油壓不正常。以A341  E型自動變速器(凌志400汽車采用)為例，在怠速運轉條件下，D位時主油路的標準油壓為0.382～0.441 M  Pa，R位時主油路的標準油壓為0.579～0.657MPa。

A common cause of gear shift shock in automatic transmissions is abnormal oil pressure. Taking the A341 E-type automatic transmission (adopted by the Lexus 400 car) as an example, under idle operation conditions, the standard oil pressure of the main oil circuit is 0.382-0.441 MPa in the D position and 0.579-0.657MPa in the R position.

在自動變速器的殼體上，有用螺塞封蓋的油壓檢測孔。如果只有1個檢測孔，它一定是主油路壓力的檢測孔;如果有多個檢測孔，說明還可以通過它們檢查節氣門閥、離心調速器和執行器伺服裝置的工作油壓。

On the housing of the automatic transmission, there is an oil pressure detection hole covered with a screw plug. If there is only one detection hole, it must be the detection hole for the main oil circuit pressure; If there are multiple detection holes, it means that they can also be used to check the working oil pressure of the throttle valve, centrifugal governor, and actuator servo device.

4.檢查節氣門位置傳感器的信號

4. Check the signal of the throttle position sensor

如果多個擋位出現換擋沖擊，說明主油壓過高，需要檢查節氣門位置傳感器(TPS)的信號是否失常，還要檢查加速踏板位置傳感器、離合器速度傳感器、電子節氣門的工作情況。如果節氣門的開度信號與發動機轉速、車速之間不匹配，出現換擋沖擊就在所難免了。

If there is shift shock in multiple gears, it indicates that the main oil pressure is too high. It is necessary to check whether the signal of the throttle position sensor (TPS) is abnormal, and also check the working condition of the accelerator pedal position sensor, clutch speed sensor, and electronic throttle. If the throttle opening signal does not match the engine speed and vehicle speed, gear shift shock is inevitable.

5.檢查輸入軸轉速傳感器是否失常

5. Check if the input shaft speed sensor is malfunctioning

輸入軸轉速傳感器負責將渦輪軸的轉速信號傳輸給TCM，以控制管路壓力、變速器換擋模式以及變矩器離合器的結合與釋放。輸入軸轉速信號同時用來近似計算工作齒輪的傳動比以及變矩器離合器的打滑量。如果輸入軸轉速傳感器的機械裝配、相互位置、線路連接或者信號傳送方面出現問題，就會導致換擋沖擊現象。

The input shaft speed sensor is responsible for transmitting the speed signal of the turbine shaft to the TCM to control pipeline pressure, transmission shift mode, and the engagement and release of the torque converter clutch. The input shaft speed signal is used to approximate the transmission ratio of the working gear and the slip of the torque converter clutch. If there are problems with the mechanical assembly, mutual position, wiring connection, or signal transmission of the input shaft speed sensor, it can lead to gear shift shock phenomenon.

6.檢查減振器工作是否正常

6. Check if the shock absorber is working properly

在自動變速器中，每個前進擋都有一個對應的減振器，它與該擋的換擋閥至換擋執行元件間的油路相通。當自動變速器換擋時，來自換擋閥

In an automatic transmission, each forward gear has a corresponding damper, which is connected to the oil circuit between the shift valve and the shift actuator of that gear. When the automatic transmission shifts, it comes from the shift valve