Hisun HS500 Owner's Manual page 173

9-5 Electric power steering system
2. Steering Torque Sensor：
Install sensor on the reducer.
① Sensor
No change after the sensor fixed.
Sensor assembly position is certained and
can not make any change, if found sensor
postion was changed caused by bolt
looseness, please tighten the bolt and
initialize the ECU at once（See Page 9-27）
3. ECU：
ECU is sophisticated electronic equipment,
and controls all the power performance of
EPS, so do not repair ECU by yourself.
If any problem happens on ECU, please
contact your local dealer to repair it.
① Upper housing ② ECU unit
③ Seal ring ④ Lower housing