50Service Manual – SC5000 04 - Control System
2-012 K2 Overload
Description Excessive current to the K2 relay coil.
Setting
Conditions
Relay coil current exceeded 2 amps.
When Monitored
Always
Possible Causes Degraded relay coil. Complete failure likely.
Initial Action Replace the K2 relay
Troubleshooting Steps
2-013 K2 Contact Weld
Description K2 contacts welded closed.
Setting
Conditions
The power module has detected power on the B+ input lug
when the K2 relay was not commanded to be closed.
When Monitored
Always
Possible Causes
• Relay failure.
• Short to ground at the relay coil control wire.
Initial Action None
Troubleshooting Steps
1. Conrm that the error is still active. If the error is active, the Power module will not be commanding the
K2 relay to close. (This is necessary for troubleshooting.)
− If the error has cleared, you will not be able to diagnose the problem. However, repetitive
reoccurrence of the error may be indicative of pitting of the relay contacts, and the relay should be
replaced.
− If the error is still active, continue to step 2.
2. Check the voltage across the relay coil.
− If the voltage is 36 volts, inspect the brown wire between the relay and power module for a short to
ground.
− If the voltage is at or near zero volts, the coil is not energized, continue.
3. Disconnect the Blue/Gray output wire from the K2 relay.
4. Check the voltage between the relay post and the battery ground post in the electrical bay.
− If the voltage remains 36 volts, the relay contacts are welded. Replace the relay.
− If the voltage is not 36 volts, continue.
5. Check the voltage between the disconnected Blue/Gray wire and the battery ground post.
− If the voltage is 36 volts, the wire Is shorted to battery positive. Repair the wire.
− If the voltage is not 36 volts, and the error persists, replace the power module.
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