This Cummins fault code 559 PDF is the official Fuel System Underfueling troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID P157, SPN 157, FMI 1/18 and the Yellow warning lamp. It is a step-by-step diagnostic flow, not a general manual, and it takes a technician from symptom to confirmed repair on this specific code.
Cummins fault code 559 explained
The ECM opens the fueling actuators for a short time to pulse fuel to the injectors for combustion, and this code sets when the metered fuel is below what the ECM expected. The front fueling actuators are on the fuel delivery housing below the air inlet horn; the injectors are in the cylinder head under the valve cover. The ECM measures the metered fuel using the front rail pressure sensor, so the chart begins by checking for active fault codes with the diagnostic tool.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Fuel System Underfueling |
| Fault identifiers | Fault Code 559, PID P157, SPN 157, FMI 1/18, Yellow lamp |
| Source / Revision | TruckFaultCodes.com, Copyright 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Fault code verification and clearing
Applicable truck models
This chart applies to on-highway trucks and equipment built on the Cummins ISM, ISX and Signature CM570 (1999-02) engines with the CM570 electronic control module. Because component and battery locations vary by chassis maker, the document repeatedly refers you to the OEM manual for exact positions. For engine specifications and dealer support, see the official Cummins engine site.
Who needs this Cummins fault code 559 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Fuel System Underfueling correctly instead of guessing at parts. It pairs with a diagnostic scan tool and standard shop meters.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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