Causes and elimination measures of abnormal upshift of automatic transmission

There are several reasons why the automatic transmission can't upshift normally:

1, the throttle cable or throttle position sensor is not adjusted properly. Check and adjust the throttle cable and throttle position sensor to eliminate the fault.

2. If the vehicle speed sensor fails, check the vehicle speed sensor and replace it.

3. If the shift valve is stuck or the gear switch fails, check the gear switch signal. If there is no fault in the control system, remove the automatic transmission.

Automatic transmission must be filled with automatic transmission oil specified by the manufacturer, and manual transmission gear oil, main reducer special oil or engine oil must not be filled by mistake, otherwise all clutches and brakes will be seriously corroded after driving for a period of time.

Automatic transmission should be replaced with automatic transmission oil in time. When replacing automatic transmission, the crude oil should be drained as clean as possible. The automatic gearbox should strictly control the oil filling amount, and the clutch and brake should be cleaned in time after ablation. The hydraulic system of the torque converter has two oil inlet holes, one at the bottom of the control valve body.

There is automatic transmission oil filter protection, and the other is the oil circuit on the input shaft. The oil inlet is located in the torque converter and is not protected by the automatic transmission oil filter. After the clutch or brake is ablated, some powder will enter the torque converter and cannot be cleaned in time. Once the lubricating oil path is blocked and the car travels for 2000~3000km, the planetary gear mechanism next to the torque converter will be ablated.