Electronically controlled mechanical automatic transmissions are generally based on geared mechanical transmissions, coupled with a computer control system, then the throttle, clutch and gear lever can be almost controlled by motor-driven or hydraulic-driven actuators. To achieve automatic control of gear selection and shifting, then the car becomes an auto-shifting car.

If the electronically controlled automatic Gearbox assembly on sale fails, first of all, it is necessary to eliminate the fault of the automatic gearbox caused by the poor oil level, the lack of oil quality, the linkage mechanism and the engine itself, such as poor "state" and oil leakage. Steps require basic inspection of the automatic transmission;

Then it is caused by the electronic control system from time to time, or because of the mechanical operating system and hydraulic control system. This can be identified by the manual shift experiment of the electronically controlled automatic transmission;

The difference between the mechanical control system and the hydraulic control system faults must be achieved through mechanical experiments, that is, hydraulic experiments, stall experiments, time lag experiments, torque converter experiments, road experiments, etc., different faults of different systems need to use different diagnostic methods To ensure the exact location of the failure