Cummins fault code 585 is the Cummins ISX11.9 CM2250 diagnostic document for the starter relay driver circuit, logged as SPN 677, FMI 4 with a amber lamp. The engine will not have starter lockout protection while this fault is active. The ECM controls the starter lockout relay circuit with a pulse width modulated signal; low voltage detected at the starter lockout circuit sets the code, and the OEM wiring diagram is needed for the return circuit. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
Cummins fault code 585 document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Starter Relay Driver Circuit — DTCs |
| Fault code / SPN / FMI | 585 / SPN 677 / FMI 4 |
| PID / Lamp | S39 / Amber |
| Year / Revision | Not stated in the extract |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the starter lockout relay circuit wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this Cummins fault code 585 manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a starter lockout relay circuit concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (14 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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