This Fault Code 585 DTCs document is a troubleshooting manual for the starter relay driver circuit on CM2250 engine applications. It explains the low-voltage or short-to-low-source fault, the starter lockout relay circuit, OEM wiring dependency, INSITE™ checks, harness tests, ECM calibration review, and clearing conditions.
Official Fault Code 585 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also referenced in the procedure set with ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other listed CM engines |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Starter Relay Driver Circuit |
| Publication no. | Not stated for this PDF; associated ISB6.7 CM2250 bulletin number 4022254 is shown in the procedure table |
| Year/Revision | Unknown; pages show Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- 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
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check starter lockout relay and circuit.
- Guided Step 3 – Check the OEM harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This document applies to Cummins CM2250 engine installations where the starter lockout relay is installed by the vehicle OEM and controlled by the ECM through a PWM starter lockout relay signal circuit. The extract specifically names ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the associated procedures, with return circuit details depending on the OEM wiring diagram. For official product and service information, visit Cummins official website.
Who needs this Fault Code 585 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when an amber CHECK ENGINE light is logged for SPN 677 FMI 4 and the starter lockout feature is disabled. It supports practical checks on relay resistance, short-to-ground faults, pin-to-pin shorts, connector condition, OEM harness integrity, and ECM calibration status.
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