This Cummins fault code 546 PDF is the official Fuel Pressure Sensor Circuit troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID P094, SPN 94, 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 546 explained
The fuel pressure sensor supplies the fuel supply pressure signal to the electronic control module (ECM). The fuel pressure sensor is located on the fuel delivery housing to the left of the front fueling actuator. This fault indicates that signal pin 29 on the ECM has been shorted to at least positive 5 VDC; the chart walks through sensor connector and harness inspection.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Fuel Pressure Sensor Circuit |
| Fault identifiers | Fault Code 546, PID P094, SPN 94, 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 546 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Fuel Pressure 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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