What is the maintenance case for an AMT transmission that does not upshift?

[Diane]

AMT transmission does not upshift maintenance case refers to a situation where the automatic transmission can only shift up to 1st gear during driving, and cannot shift to 2nd gear or higher gears; or it can shift to 2nd gear, but cannot shift to 3rd gear or overdrive. In such cases, it is necessary to seek professional repair from a 4S shop technician. Below is a relevant introduction to AMT transmissions: Overview: AMT is developed based on manual transmissions, retaining the gear-shifting structure and clutch of manual transmissions. The operations required for manual transmissions, such as pressing the clutch and selecting gears, are performed by an automatic control mechanism managed by a computer in AMT. Therefore, AMT essentially uses a computer system to operate the clutch and select gears. Technical Core: The core technology of AMT is microcomputer control, where the level and quality of electronic technology directly determine the performance and operational quality of AMT. Taking Magneti Marelli, the largest supplier of AMT, as an example, the AMT system design is completed through computer-controlled hydraulic shifting assistance systems, with components including pressure storage tanks, solenoid valves, etc.