53Service Manual – SC5000 04 - Control System
2-023 M3 Sweep Motor Open
Description Sweep motor is open circuit.
Setting
Conditions
The power module has detected no current on the M3 output
lug. .
When Monitored
Always
Possible Causes
• Disconnected motor.
• Worn carbon brushes
Initial Action Check Fuse F6
Troubleshooting Steps
1. Unplug the sweep motor connector.
2. Check the resistance between contacts 1 and 2 of the sweep motor. (The static resistance should be
very low.)
− If the resistance is high (open circuit), replace the motor brushes
− If the resistance is low (0.5 to 1.0 ohms), repair or replace the wiring harness between the motor and
the power module.
2-024 M4 Vacuum Motor 1 Open
2-025 M5 Vacuum Motor 2 Open
Description The vacuum motor is open circuit.
Setting
Conditions
The power module has detected no current on the M4 or M5
output lug.
When Monitored
Always
Possible Causes
• Faulty wiring
• Worn carbon brushes
Initial Action Check Fuse F7 (Vac1) or Fuse F8 (Vac 2)
Troubleshooting Steps
1. Disconnect the vacuum motor connector in the battery bay.
2. Power up the machine and command the vacuum motor to run.
3. Check the voltage at the harness connector.
− If the voltage is at or near 36 volts (any voltage not near 0 volts), Inspect or replace the Vacuum
Motor Brushes described on page 214.
− If the voltage is at or near zero, repair the main harness.
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