Yesterday, I received a request for help from a Chengdu master, and the 10-year-old Zhonghua Junjie replaced the engine computer of the dismantling car, but the equipment could not be matched and the vehicle could not be started.
The car is equipped with a Siemens anti-theft system and a Delphi MT20U2 engine computer. Under normal circumstances, Chinese cars are fixed password 3950, replace the anti-theft box or engine computer, only need to use the equipment reset and then match, but the vehicle age is relatively old, the line may be aging, the equipment can not complete the matching, at this time it is necessary to read the data of the anti-theft box and the engine computer for manual rewriting, the synchronization data of the engine computer is written into the Siemens anti-theft box, to complete the manual matching.
First of all, it is necessary to read the data of the engine computer MT20U2, which is stored in the CPU-2M53J. Wiring can be read using the programmer. The backup read data cannot be read, and the read needs to be unlocked, and there are three partitions: dflash, eee, and pflash. Synchronization data is stored in the EEE partition. After reading out the data, it also needs to be locked, otherwise the engine computer will report an anti-theft failure.
Delphi's engine computer, as long as the CPU model is the same, the position is fixed. Mark out the synchronization data and password, and the next step is to rewrite the synchronization data of the dismantling engine computer into the anti-theft box.
Siemens anti-theft box, anti-theft data is stored in the 93C56 eight-legged code chip, the read data is encrypted, it needs to be decrypted before the change, and then changed after decryption, after the change is completed, it is also necessary to recalculate the verification of the synchronized data, and the data duplication area also needs to be changed. After all the changes are completed, you need to use the decryption method to encrypt it back before it can be written into the anti-theft box.
Because the key P byte in the key chip is calculated by synchronizing the data, the synchronization data of the anti-theft box is changed, so the original key can not be used, and the data needs to be matched with a new key after the data is changed. Siemens dedicated 46 chips can also be generated manually, and the following is how to manually generate Siemens dedicated chips.