This Cummins EGR cooler fault document is a troubleshooting PDF for Fault Code 3342 on CM2250 engines. It explains the EGR cooler efficiency fault, the EGR temperature sensor circuit, INSITE checks, cooling-system checks, harness tests, and ECM calibration review.
Official Cummins EGR cooler fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 (2010-12) group listing; extract also references ISX11.9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 associated procedures. |
| System/Group | DTCs; Engine Exhaust Gas Recirculation Cooler Efficiency |
| Publication no. | 4022250, 2883445, 4022256, and 4022255 appear in the associated procedures table. |
| Year/Revision | Last Modified: 11-Jun-2010 and 08-Dec-2010 |
| Pages | 15 |
| 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 cooling system.
- Guided Step 3 – Check the EGR system.
- Guided Step 4 – Check the EGR temperature sensor.
- Guided Step 5 – Check the ECM and engine harness.
- Guided Step 6 – Check ECM calibration and clear fault codes.
Applicable truck models
The file is listed for Cummins ISB6.7 CM2250 (2010-12) DTC coverage. The extracted procedure text also names ISX11.9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the associated procedures table for EGR Cooler, EGR Mass Measurement Flow Assembly, ECM Calibration Code, and EGR Temperature Sensor procedures. Verify the engine model, ECM calibration, and service bulletin coverage before applying the steps. See the manufacturer source at Cummins official website.
Who needs this Cummins EGR cooler fault manual
This manual suits diesel mechanics and workshop owners diagnosing amber CHECK ENGINE lamp or MIL events for Fault Code 3342, SPN 4752 FMI 18. It is useful when checking coolant mixture, coolant level, EGR differential pressure sensor ports, EGR temperature sensor accuracy, connector pins, engine harness response, and ECM calibration status with INSITE.
The diagnostic path states that Fault Code 3342 sets when the ECM detects EGR temperature above a threshold for 5 seconds, indicating the EGR cooler is not cooling recirculated exhaust gas sufficiently. Possible causes listed are a malfunctioning EGR temperature sensor and a malfunctioning EGR cooler. The guided checks include looking for other active fault codes, confirming coolant condition, inspecting for soot or debris plugging, comparing EGR temperature to ambient air temperature within 10° C [18° F], and checking for Fault Code 2375 or Fault Code 2376 during circuit response tests.
For repair validation, the document instructs starting the engine and letting it idle for 5 minutes, then using INSITE to confirm the fault becomes inactive after the diagnostic runs and passes. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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