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Cummins ISC CM2150 (2007-09) Fault Code: 585 PID: SID 039 SPN: 677 FMI: 4 Starter Relay Driver Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at starter lockout circuit.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

The ECM monitors the voltage level on this circuit. If it detects a low voltage when the signal is commanded on, it records this fault code. This fault code can be caused by a short circuit to ground in the starter lockout relay, OEM harness, or connectors.

Possible repairs:

1)Replace the starter lockout relay.
2)Clean, repair, or replace the OEM harness.
3)Repair or replace the OEM harness.
4)Replace the ECM.

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