03SG1 - Motor Resistance

03SG1 - Motor Resistance


03SG1 - Motor ResistanceSymptomsReasonsMosfet is DeadChecklistTroubleshootSolution

Symptoms


CAN'T PUSH bike backward

The motor resistance with both Throttle and PAS condition. 


Reasons


Mosfet is Dead


Huge resistance when moving the motor with the off throttle or off controller means the Mosfet is dead.

This is a less common case because it is an electronic topic instead of mechanical parts. 

(The 12x black components in the picture)


Checklist


1. Turn crank backwards

2. Hold pedal turn chainring

3. turn crank and changing together (forward)

4. Turn chainring without holding crank


Troubleshoot


Solution


Replace the Controller