Vivid V4 - Speed Control and Movement Issues; Direction Change Malfunctions

Parking brake
doesn’t loosen
Loosen parking
brake
Over-heat protec-
tion
Check, eliminate
2) Lose control when vehicle starts running:
speed cannot be adjusted
Malfunction Possible reason Troubleshooting
Vehicle runs at full
speed when it just
starts
Terminals of Solenoid
stick together
Check, repair
Controller failure Change
Potentiometer failure Repair, change
Vehicle stops
immediately after it
starts
Internal short of
Motor
Repair, change
Motor is assembled
too tight or blocked
Repair, change
Controller failure Repair, change
Accelerator Failure Repair, change
Normal at low speed
Weak power at high
speed
Controller Failure Check, change
Motor Failure Check, change
Accelerator Failure Check, change
3) Vehicle cannot change direction: vehicle can
only run in the one direction
Malfunction Possible reason Troubleshooting
Vehicle can only run
in one direction
F&R switch failure Change
Controller Failure Change
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