How to solve the problem of inaccurate odometer of Sinotruk T7H vehicle?

When the odometer of Sinotruk T7H vehicle is inaccurate,

■ Cause of failure:
The vehicle speed sensor is in poor contact, and the configuration calibration is inaccurate.

■ Tools used for maintenance:
multimeter

■ The process of fault checking:

1. Check whether there is iron filings and wear on the top of the odometer sensor;
2. Use a multimeter to check whether the voltage of pin 1 and pin 2 is 12V;
3. Check that the voltage of the fourth section of the plug has not changed to zero;
4. Link to the diagnostic instrument: open the Sinotruk six-in-one software, open the TFT
   Parameter configuration in the instrument, observe MTCO option, normal vehicle
   Configuration should not be checked.