This Cummins fault code 581 PDF is the official Fuel Inlet Restriction Sensor Circuit troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID P015, SPN 1381, FMI 3/3 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 581 explained
The fuel inlet restriction sensor supplies a fuel pressure signal to the electronic control module (ECM). The fuel inlet restriction sensor is located on the fuel filter head. This fault indicates a short circuit of at least positive 5 VDC at signal pin 28 on the actuator harness connector at the ECM; the chart walks through connector and harness checks.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Fuel Inlet Restriction Sensor Circuit |
| Fault identifiers | Fault Code 581, PID P015, SPN 1381, FMI 3/3, Yellow lamp |
| Source / Revision | TruckFaultCodes.com, Copyright 2017 |
| 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
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 581 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Fuel Inlet Restriction Sensor Circuit 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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