This document is a Cummins 2451 troubleshooting manual for Fault Code 2451 on electronic Cummins engines. It explains the calculated turbocharger turbine inlet temperature fault, diagnostic conditions, likely causes, and guided repair checks using INSITE™ electronic service tool.
Official Cummins 2451 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); also references ISB, ISC, and ISL Electronic Control Module applications in the procedure text |
| System/Group | DTCs; turbocharger turbine inlet temperature calculated fault diagnostics |
| Publication no. | Not listed in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 2451
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the air handling system.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) fault diagnostics and also includes procedure references for ISB, ISC, and ISL engines using the listed Cummins service manuals. The covered fault is Fault Code 2451, SPN 2789, FMI 0/16, described as Turbocharger Turbine Inlet Temperature (Calculated) – Data Valid but Above Normal Operational Range – Moderately Severe Level. The document states that there is not a physical exhaust gas temperature sensor in the system; the electronic control module calculates turbine inlet temperature from engine operating conditions including intake manifold air temperature, engine speed, injection timing, intake manifold pressure, and fuel flow. Manufacturer information is available at Cummins official website.
Who needs this Cummins 2451 troubleshooting manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins 2451 troubleshooting document when a truck logs a calculated high turbine inlet temperature fault under load. It is useful for checking low boost pressure causes, charge-air cooler leaks, loose clamps, damaged turbocharger blades, EGR plumbing leaks, high turbocharger compressor inlet temperature, and ECM calibration status.
The guided checks use INSITE™ electronic service tool to read active and inactive fault codes, including Fault Code 2634, 2449, 2387, and 2973 where applicable. The air handling section covers the air intake sealing surface between the air filter and hood air plenum, charge-air cooler hoses and piping, turbocharger compressor and turbine blade inspection, EGR connection tubing, and comparison of turbocharger compressor inlet temperature with ambient outside temperature. The ECM section directs the technician to compare the ECM code and revision number with the ECM Calibration Revision History and calibrate the ECM if required.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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