Fault situation: Abnormal noise is called abnormal noise in the maintenance industry. During the operation of a car, there is a common abnormal noise inside the automatic transmission. The automatic transmission makes a abnormal noise while the car is in motion, and the abnormal noise disappears after parking and shifting gears.

一般來說，原因如下幾個方面：

Generally speaking, the reasons are as follows:

※油泵因磨損過甚或自動變速器油面高度過低、過高而產生異響

The oil pump may produce abnormal noise due to excessive wear or even low or high automatic transmission oil level

※液力變矩器因鎖止離合器、導輪單向超越離合器等損壞而產生異響

The hydraulic torque converter produces abnormal noise due to damage to the lock up clutch, guide wheel one-way overrunning clutch, etc

※行星齒輪機構異響

※ Abnormal noise from planetary gear mechanism

※換檔執行元件異響

※ Abnormal noise from shift actuator

解決方法：

Solution:

※檢查自動變速器油油面高度。若太高或太低，應調整至正確高度。

※ Check the oil level of the automatic transmission. If it is too high or too low, it should be adjusted to the correct height.

※應舉升器將汽車升起，起動發動機，在空檔、前進檔、倒檔等狀態下檢查自動變速器產生異響的部位和時刻。

※ The car should be raised with a hoist, the engine should be started, and the location and timing of abnormal noise generated by the automatic transmission should be checked in neutral, forward, reverse, and other states.

※若在任何檔位下自動變速器前部始終有連續的異響，通常為油泵或液力變矩器異響，對此，應拆檢自動變速器，檢查油泵有無磨損、液力變矩器內有無大量摩擦粉末。如有異常，應更換油泵或液力變矩器。

If there is continuous abnormal noise at the front of the automatic transmission in any gear, usually from the oil pump or hydraulic torque converter, the automatic transmission should be disassembled and inspected for wear on the oil pump and a large amount of friction powder inside the hydraulic torque converter. If there are any abnormalities, the oil pump or hydraulic torque converter should be replaced.

※若自動變速器只有在行駛中才有異響，空檔時無異響，則為行星齒輪機構異響。對此，應分解自動變速器，檢查行星齒輪機構各個零件有無磨損痕跡、齒輪有無斷裂，單向超越離合器有無磨損、卡滯，軸承或止推墊片有無損壞。如有異常，應予以更換。

If the automatic transmission only makes abnormal noise during driving and there is no abnormal noise in neutral, it is a planetary gear mechanism abnormal noise. In this regard, the automatic transmission should be disassembled and checked for signs of wear on various parts of the planetary gear mechanism, gear breakage, one-way overrunning clutch wear and jamming, and bearings or thrust washers for damage. If there are any abnormalities, they should be replaced.