This Cummins 3755 manual is a fault code troubleshooting document for Cummins aftertreatment diesel exhaust fluid dosing diagnostics. It explains Fault Code 3755, SPN 5394 FMI 2, where the ECM detects data that is erratic, intermittent, or incorrect in the DEF dosing system. The file is useful when diagnosing SCR NOx conversion concerns with INSITE™.
Official Cummins 3755 manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Controller |
| Publication no. | Associated ECM calibration bulletins: 4022254, 4022257, 4022250, 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 6 |
| 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 1A – Check for active fault codes.
- Guided Step 1B – Check for active fault codes.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This procedure applies to Cummins CM2250 engine platforms listed in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The SCR exhaust aftertreatment components covered include the SCR catalyst, DEF dosing unit, DEF controller, DEF dosing valve, DEF tank, decomposition tube, DEF lines, intake NOx sensor, and outlet NOx sensor; locations vary by vehicle application and OEM. The diagnostic runs during the INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test and compares intake and outlet NOx values to evaluate SCR catalyst and dosing system conversion efficiency. See the Cummins official website.
Who needs this Cummins 3755 manual
Workshop technicians need this Cummins 3755 manual when Fault Code 3755 is active or stored while diagnosing related aftertreatment faults. The extract states that this code is used to assist troubleshooting Fault Codes 3151, 3543, and/or 3582, with checks for active codes, ECM calibration revision, clearing, and validation through the regeneration test.
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