This 4-page PDF documents Cummins fault code 255, the fuel shutoff, fan clutch and engine brake supply circuit on the Cummins M11 and N14 CELECT Plus (1995-98) engine platform. Published in the TruckFaultCodes.com fault code library (© 2017), it carries the yellow lamp, PID S026, SPN 701 and FMI 3 and service repair time code 00-603, and lays out the full factory troubleshooting tree.
Cummins fault code 255 document details
| Brand | Cummins |
| Model coverage | M11 and N14 CELECT Plus (1995-98) |
| System / group | Fuel Shutoff and Enable Supply Circuit — Fault Code 255 |
| Publication reference | TruckFaultCodes.com fault code reference (© 2017) |
| Year / revision | 1995-98 platform, TruckFaultCodes.com 2017 edition |
| Pages | 4 |
| File size | 0.25 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID S026, SPN 701, FMI 3, yellow lamp)
- Circuit description
- Component location
- Shop talk on external voltage sources
- Troubleshooting steps
Circuit description and component location
This shared supply circuit feeds the fuel shutoff valve, the fan clutch and the engine brake. If voltage is applied externally on these wires, the enable voltage stays on and the code sets. The fuel shutoff solenoid valve is mounted on top of the fuel supply pump and controlled by the ECM, while the engine brake and fan clutch locations vary by OEM wiring diagram.
If an external shutdown system is fitted, it is checked for miswiring that could feed voltage back into the fuel shutoff supply circuit, and the actuator connector pins are flushed with electronic contact cleaner and inspected. All checks are made with a Cummins service tool such as Compulink, Echek or a diagnostic tool, and inactive codes are cleared once the repair is confirmed.
Applicable truck models and engines
This document applies to Cummins M11 and N14 CELECT Plus (1995-98) electronic engines and is filed under the CELECT Plus diagnostic trouble codes group, so it suits on-highway and industrial installations that run these engines. For engine specifications and dealer support, see the official Cummins support site at the Cummins engine support portal. The full PDF is part of the fuel shutoff, fan clutch and engine brake supply circuit chapter of the CELECT Plus fault code series held in the DiagTechPro manuals library.
Who needs this Cummins fault code 255 manual
Truck technicians and workshop owners need this document when a yellow lamp warns of a fuel shutoff and enable supply problem on M11 or N14 CELECT Plus engines, so they can follow the factory pin checks, resistance measurements and step-by-step decisions instead of guessing at parts.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Cummins DTCs
- Cummins M11 CELECT Plus (1995-98)
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