46Service Manual – SC5000 04 - Control System
1-105 H1 Horn Short
Description Horn - too much current
Setting
Conditions
Amp Draw is higher than 5 Amps
When Monitored
Always
Possible Causes
• Shorted horn
• Control wire shorted to power
Initial Action None
Troubleshooting Steps
Disconnect the horn and check if the error persists.
− If the error persists, the control wire is shorted to battery positive power. Repair or replace the
harness.
− If the error clears, replace the horn.
1-106 M8 Det Pump Short
Description Detergent pump 1 - too much current
Setting
Conditions
Amp Draw is higher than 2 Amps
When Monitored
Always
Possible Causes
• Shorted Pump (solenoid) Winding M8
• Either control wire shorted to power or ground
Initial Action None
Troubleshooting Steps
1. Disconnect both wires from the detergent pump.
2. Measure the resistance of the solenoid coil.
− If the resistance is less than 8 ohms, replace the solenoid.
− Otherwise, continue.
3. With the machine powered, but not scrubbing, check the voltage from each wire of the solenoid and
the main ground lug.
− If either measurement is signicantly different from 12 volts (near 0 volts or near 36 volts), that wire is
shorted to an alternate power source.
− If both voltages are near 12 volts, and the error persists while the solenoid is disconnected, replace
the main controller.
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