Cummins ISM Code 199 documents the ICON Lamp Circuit Short or Open diagnostic and troubleshooting procedure for the Cummins ISM CM570 (1999-02) engine platform. This 4-page fault code sheet from TruckFaultCodes.com (Copyright 2017) covers fault code 199 (PID S122, SPN 612, 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 | 199 — PID S122, SPN 612, FMI 4/4 |
| Warning lamp | YELLOW |
| Pages | 4 |
| 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 199 diagnostic steps
The ICON lamp indicates when the ICON system is active and flashes ICON fault codes. This fault typically indicates a short circuit to ground or an open circuit; a short can keep the lamp on continuously, while a burned-out bulb causes an open circuit. It cannot be flashed out on the ICON lamp and is read with a diagnostic tool. The four-page procedure inspects the lamp, bulb, and wiring before the code is cleared.
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 ICON lamp. The ICON lamp is typically on the cab dashboard panel. 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 199 manual
Heavy-duty diesel technicians, fleet service teams, and owner-operators diagnosing a yellow-lamp ICON lamp 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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