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5.4 Support for fault diagnostics and elimination
Problem Possible cause
1. Power pack’s electric
motor does not work
Battery cable or ground cable is not connected or is defective
Cable to driver’s cabin is disconnected
Main fuse is defective
Fuse in power pack is defective
Main battery switch is not switched on
Switch in driver’s cabin is not switched on
Power relay is defective and does not operate
Motor is defective
2. The motor does not
work when the
pushbuttons or toggle
switch are pressed
Power relay is defective
Cable from control panel (control cabinet) to power pack is
defective
Control lines in power pack are defective
Control panel (control cabinet) is defective
3. Liftgate does not open
or opens slowly
Platform sticks at the vehicle cargo area
Power pack motor does not start
Cable feed to solenoid valve is defective
Solenoid valve from closing cylinder is defective
Valve YA does not operate
Reactor in the closing cylinder is defective or blocked
4. Liftgate does not lower
or lowers slowly
Solenoid valve Y3 is not triggered or is defective
Valve YA does not operate
Reactor in the lifting cylinder is defective or blocked
5. Liftgate tilts down
instead of up when
operated with the foot
controls or handheld
control
Pressure switch S4 does not operate
Cable is defective
Mechanical damage to lifting cylinder
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