The repair shop asked for help, and a 12-year-old Zhonghua H530 could not start, and the anti-theft failure was reported.
Inquiry, I learned that this car uses a smart key, which is started with one button, and the vehicle has been in use, and it suddenly can't be started today. Drag it to the repair shop and read the fault code with 431 is the fault of the anti-theft module.
Suspecting the loss of anti-theft data, I rushed to the scene with all my tools.
After arriving at the scene, the smart key remote control is normal, and the motor can also be started, but it does not inject fuel, and the reading data stream shows that the anti-theft ECU is not programmed.
Let's take a closer look at the Zhonghua H530 push-button smart key dual anti-theft system.
This PEPS smart box data is encrypted and cannot be read out by the programmer. However, when the anti-theft box and the engine computer are matched, the PEPS smart box can be reset and matched at will.
If the data of the anti-theft box is lost, and the device cannot be matched, you can only choose to disassemble the engine computer, find out the synchronization data, and manually write it into the anti-theft box. If the engine computer and the anti-theft box are damaged, you can also get the whole set of data, and the smart key of the original car cannot be used after the whole set of data, because the smart key also has a key key P byte, and the changed data can only match a new smart key. The smart box cannot read the data, and after obtaining a full set of data, it is necessary to reset the PEPS, and then match the PEPS with the device, and at the same time match the steering lock before starting the vehicle.
The premise of these operations is that the format of the anti-theft data and the location of the synchronized data must be known, as well as the validation algorithm of the data.
The data of the anti-theft box is encrypted, and it needs to be decrypted before it is changed, and after the change is completed, it must be encrypted by the method of decryption before it can be written into the anti-theft box.