Fault diagnosis method for hydraulic oil supply system of AMT actuating mechanism

The invention belongs to the technical field of vehicle transmission system control, and particularly relates to a fault diagnosis method for a hydraulic oil supply system of an AMT actuating mechanism. The fault diagnosis method for the hydraulic oil supply system of the AMT actuating mechanism comprises the following steps of 101, acquiring signals; 102, judging a fault of a main pressure sensor; 103, judging a fault of a pressure maintaining valve; and 104, judging a fault of an oil source motor. Compared with the prior art, according to the technical scheme, in the vehicle running process,TCU monitors a running state of the system in real time, a series of sensor signal value effective ranges and main pressure sensor signal change rate threshold values are preset, self-diagnosis can be conducted on the system faults, a diagnosis result is obtained, therefore, corresponding fault codes and countermeasures can be provided, the driving reliability and safety of a vehicle can be improved, and productization a