Cummins ISM CM870 (2003-06) Fault Code: 584 PID: S39 SPN: 677 FMI: 3/3 Starter Relay Driver Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at starter lockout circuit.
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The ECM monitors the voltage level on this circuit. If it detects a voltage when the signal is commanded off, it records this fault code.
Possible causes:
1)Open circuit in the starter lockout relay, OEM harness, or connectors 2)Short circuit to a voltage source in the OEM harness or relay. This fault can also be set active if the over crank protection feature (starter lockout) is enabled, but the engine/ECM is not wired to support it.
Possible repairs:
1)Replace the starter lockout relay. 2)Repair or replace the OEM harness. 3)Repair the source of the failed ground connection.