This document is a Cummins 2743 fault code troubleshooting manual for ISB6.7 CM2150 aftertreatment diagnostics. It explains Fault Code 2743, SPN 3249 FMI 18, where aftertreatment exhaust gas temperature 2 is valid but below the normal operating range during stationary regeneration or extended idle conditions.
Official Cummins 2743 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL CM2150 service procedures |
| System/Group | DTCs; ISB, ISC, and ISL – Aftertreatment System |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 2743
- 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 exhaust system for leaks.
- Guided Step 3 – Check the turbocharger outlet.
- Guided Step 4 – Perform a stationary regeneration.
- Guided Step 5 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 group, with related procedure references for ISB CM2150, ISC CM2150, and ISL CM2150 engines. The covered system is the aftertreatment diesel oxidation catalyst and diesel particulate filter temperature monitoring circuit, including the diesel oxidation catalyst inlet temperature sensor, diesel particulate filter inlet temperature sensor, and diesel particulate filter outlet temperature sensor. The component location can vary by original equipment manufacturer because the aftertreatment diesel oxidation catalyst is installed in the exhaust system. For current manufacturer information, visit Cummins official website.
Who needs this Cummins 2743 fault code manual
Workshop owners, diesel mechanics, and fleet technicians need this manual when an amber lamp is active and INSITE™ shows aftertreatment exhaust temperature data below the target needed for stationary regeneration. It is useful for checking VGT and EGR related fault codes, comparing aftertreatment temperature sensor readings within 25°C [45°F], inspecting exhaust leaks, verifying the correct insulated OEM downpipe, inspecting the turbocharger outlet for oil, coolant, or fuel, performing the Aftertreatment Diesel Particulate Filter Test, and clearing inactive codes.
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