Cummins ISM Code 255 documents the Fuel Shutoff Valve Drive Circuit diagnostic and troubleshooting procedure for the Cummins ISM CM570 (1999-02) engine platform. This 6-page fault code sheet from TruckFaultCodes.com (Copyright 2017) covers fault code 255 (PID S017, SPN 632, FMI 3/3, YELLOW lamp) and the checks used to confirm and clear it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570, ISX CM570, Signature CM570 (1999-02) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | 255 — PID S017, SPN 632, FMI 3/3 |
| Warning lamp | YELLOW |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop talk
- Troubleshooting steps
- Fault code verification and clearing
Cummins ISM Code 255 diagnostic steps
Troubleshooting begins by confirming the fault is active with a diagnostic tool, then inspecting the fuel shutoff valve connector and engine harness ring terminal for corroded, bent, or pushed-back pins. Technicians measure solenoid resistance against the voltage-specific table (for example 6 to 15 ohms for 12-VDC solenoids), verify the diagnostic supply voltage is greater than 5.0 VDC, and check the ECM connector for open and short circuits before disabling and clearing the code and idling the engine to confirm the repair.
Applicable truck models
This sheet applies to Cummins ISM CM570, ISX CM570, and Signature CM570 (1999-02) engines built around the CM570 ECM and the fuel shutoff valve. The fuel shutoff valve solenoid sits on the fuel delivery housing below the air inlet horn and is controlled by the ECM. The document is laid out with a circuit description, a component location note, shop-talk tips, and a step-by-step troubleshooting chart whose go-to branches route the technician through each measurement. Refer to the official Cummins engine support site for wiring diagrams and component part numbers.
Who needs this Cummins ISM Code 255 manual
Heavy-duty diesel technicians, fleet service teams, and owner-operators diagnosing a yellow-lamp fuel shutoff valve fault will use this sheet to follow the factory decision tree, confirm the reading, and repair the harness, connector, or component instead of replacing parts on guesswork. It spells out each measurement threshold and its pass or fail branch, so the fault can be verified active, the repair validated, and the inactive code cleared with the diagnostic tool.
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