66Service Manual – SC5000 04 - Control System
2-087 Under Temp Cutback
Description Internal temperature is below -25C - output current will be reduced
Setting
Conditions
When Monitored
Always
Possible Causes
Initial Action If the error persists after the machine has warmed, replace the power module.
Troubleshooting Steps
2-088 K2 Coil Open
Description Main contactor coil not detected
Setting
Conditions
Same
When Monitored
Always
Possible Causes
• Disconnected K2 relay coil
• Faulty relay
Initial Action None
Troubleshooting Steps
1. Leave the machine powered.
2. Check the voltage between the Gray wire at the K2 relay coil and the main ground lug in the electrical
bay.
− If the voltage is not at or near battery voltage, repair or replace the gray wire.
3. Check the voltage between the brown wire at the K2 relay coil and the main ground lug in the electrical
bay.
− If the voltage is at or near 0 volts, and the K2 relay is not active, replace the K2 relay.
− If the K2 relay is active, and the error is still being reported, replace the power module.
− If the voltage is at or near battery voltage, continue.
4. Check the voltage between contact J3-2 and the main ground lug in the electrical bay.
− If the voltage is at or near 0 volts, repair or replace the brown wire.
− If the voltage is at or near 36 volts, and the error is still being reported, replace the power module.
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