Cummins ISM Code 245 documents the Engine Fan Clutch Supply 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 245 (PID S033, SPN 647, FMI 4/4, 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 | 245 — PID S033, SPN 647, FMI 4/4 |
| 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 245 diagnostic steps
The fan clutch solenoid is a device the ECM uses to open or close the engine fan by sending a signal to the solenoid. A likely cause of this fault is a short circuit to ground on the ECM fan clutch supply. Troubleshooting inspects the solenoid and its harness using the OEM diagram, checks the supply and return circuits for shorts and open circuits, and verifies pin condition at the ECM connector before clearing the code and verifying 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 fan clutch solenoid. Use the OEM diagram to locate the fan clutch solenoid. 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 245 manual
Heavy-duty diesel technicians, fleet service teams, and owner-operators diagnosing a yellow-lamp fan clutch solenoid 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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