Cummins ISM Code 198 documents the ICON Lamp Circuit Short to Battery diagnostic and troubleshooting procedure for the Cummins ISM CM570 (1999-02) engine platform. This 3-page fault code sheet from TruckFaultCodes.com (Copyright 2017) covers fault code 198 (PID S122, SPN 612, 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 | 198 — PID S122, SPN 612, FMI 3/3 |
| Warning lamp | YELLOW |
| Pages | 3 |
| 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 198 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 battery voltage and cannot be flashed out on the ICON lamp itself; it is read with a diagnostic tool or by flashing the diagnostic code on the red and yellow lamps. The three-page procedure inspects the lamp circuit wiring and connector pins to isolate the short 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 198 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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