This Cummins ISB fault 2754 manual is a Cummins troubleshooting document for Fault Code 2754, SPN 81 FMI 16, covering engine particulate filter inlet pressure above normal range. It explains why excessive black smoke entering the aftertreatment diesel particulate filter can set the amber lamp fault, then outlines guided checks with INSITE™ electronic service tool.
Official Cummins ISB fault 2754 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL aftertreatment |
| System/Group | DTCs; ISB, ISC, and ISL – Aftertreatment |
| Publication no. | Not stated for this PDF; referenced service manuals include Bulletin 4021578 and Bulletin 4021569 |
| Year/Revision | Year unknown; last modified entries show 15-Sep-2010 and 20-Jul-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- 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 intake system for leaks.
- Guided Step 3 – Check the intake manifold pressure sensor.
- Guided Step 4 – Check the barometric pressure sensor.
- Guided Step 5 – Check the fuel system.
- Guided Step 6 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 group and also references ISB, ISC, and ISL aftertreatment troubleshooting paths. The aftertreatment diesel particulate filter is OEM-installed in the exhaust system, so vehicle layout can vary by truck manufacturer while the diagnostic logic remains tied to Cummins engine and ECM data. See the official Cummins website.
Who needs this Cummins ISB fault 2754 manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins ISB fault 2754 reference when an engine logs excessive soot accumulation or black smoke entering the DPF with no immediate performance derate stated. The procedure helps separate aftertreatment symptoms from charge-air leaks, VGT and EGR faults, pressure sensor errors, injector misfire, and ECM calibration issues.
The troubleshooting flow starts with active VGT and EGR valve operation fault codes, then checks intake manifold pressure sensor and EGR differential pressure sensor faults. It continues with charge-air cooler hoses, clamps, air intake connections, and charge air cooler restriction. Sensor checks compare INSITE™ readings against a mechanical intake manifold pressure gauge within 127 mm Hg [5 in-Hg], and barometric pressure readings within 102 mm Hg [4 in-Hg] of local barometric pressure. Fuel system diagnosis uses the Cylinder Cutout Test to isolate a misfiring injector. The final section checks ECM code and revision number against ECM Calibration Revision History before disabling and clearing inactive fault codes.
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