fault code 3348 DTCs is the official Cummins troubleshooting document for SPN 1176 FMI 1/1 — Turbocharger 1 Compressor Inlet Pressure – Data Valid But Below Normal Operating Range – Most Severe Level — on the ISX11.9 CM2250 (2010-12) engine platform. This 13-page PDF is taken from the Cummins service manual and covers the circuit description, the conditions that set the code, and the full guided step-by-step repair. It references Cummins troubleshooting procedure 019-032, last revised 11-Jun-2010.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Turbocharger 1 Compressor Inlet Pressure – Data Valid But Below Normal Operating Range – Most Severe Level |
| Diagnostic identifier | SPN 1176 · FMI 1/1 · Red lamp |
| Publication reference | Procedure 019-032 |
| Revision | 11-Jun-2010 |
| Pages | 13 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Troubleshooting Steps and Associated Procedures
- Guided repair steps with specifications
What fault code 3348 DTCs means
Turbocharger 1 Compressor Inlet Pressure – Data Valid But Below Normal Operating Range – Most Severe Level. The estimated differential pressure across the turbocharger is above the critical level. Progressive power derate increasing in severity from the time of alert. If the Engine Protection Shutdown feature is enabled, the engine will shut down 30 seconds after the red STOP lamp starts flashing. The manual explains that the ECM calculates a differential pressure across the turbocharger using the intake manifold pressure sensor and the crankcase pressure sensor.. The document lists the exact ECM conditions under which this code is set and cleared, so a technician can confirm the diagnosis with INSITE electronic service tool before replacing parts.
Applicable truck models and engines
This troubleshooting procedure applies to Cummins ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) engines from the 2010-2012 CM2250 electronic control family. The same guided steps are shared across the CM2250 range covered in this bulletin. Full engine and vehicle coverage should always be confirmed against the official Cummins Inc. website for your ECM calibration.
Who needs this fault code 3348 DTCs manual
Heavy-truck diesel technicians and workshop owners diagnosing SPN 1176 on ISX11.9 CM2250 engines need this document to follow the factory procedure instead of guessing. It is part of the wider DiagTechPro manuals library of Cummins troubleshooting manuals.
The complete PDF of this Cummins troubleshooting manual is available in the DiagTechPro manuals library — a free account is required to download.
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