Control method for OBD fault diagnosis and processing of DCT

The invention discloses a control method for OBD fault diagnosis and processing of DCT. The control method comprises the following steps: 1) initializing each flag bit; 2) setting each threshold value; (3) whether the pending faults are marked is judged according to conditions, and the number of driving cycle faults is modified into the number of driving cycle times; 4) according to conditions, judging whether a permanent fault flag bit, a confirmation fault flag bit and an MIL are turned on or not, modifying the driving cycle fault frequency into the driving cycle frequency, and modifying the warming-up cycle fault frequency into the warming-up cycle frequency; (5) after the hardware fault flag bit is reset, if the difference between the driving cycle frequency and the driving cycle fault frequency is equal to a pending fault clearing threshold value, the pending fault flag bit is reset; 6) if the difference between the number of driving cycles and the number of driving cycle faults is larger than or equal t