Here we will demonstrate how to correct odometer of the new Great Wall Haval models. Taking a 2021 Haval H6 as an example, its instrument cluster is equipped with an MB91F594BS encrypted chip, and almost no devices can read the data from this encrypted chip.
with Fujitsu MB91F594BS microcontroller.
Tool used:
CG100X programmer
Instructions:
Record the original mileage.
Remove instrument cluster and disassemble.
Power on the instrument cluster according to the wiring diagram and give 12V power supply. Check if the dashboard is in good condition.
Verify the original mileage—the initial reading is 212,528 km, which matches the actual mileage.
Customer desired mileage: 62,068km.
In CG100X software, select Great Wall- Haval H6- MB91F594BS.
Device cannot read chip data directly so there is no wiring diagram for this cluster.
Connect the cluster with CG100X programmer via the CAN adapter and cable as following:
Then read mileage data with CG100X software.
Ensure that the data read by the software matches the data displayed on the instrument cluster.
The device does not have an automatic mileage adjustment algorithm—contact CG100 technical support to manually modify the mileage data.
During the mileage correction process, the instrument cluster screen going blank is normal.
Once the adjustment is complete, power on the cluster to check the new mileage data.
Install dashboard back to vehicle.
