This Cummins 1673 DEF manual is a 5-page troubleshooting document for Fault Code 1673 and the aftertreatment diesel exhaust fluid tank level sensor. It explains the fault reason, driver warnings, derate actions, clearing conditions, and INSITE™ service tool checks for CM2250 engine applications.
Official Cummins 1673 DEF manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Tank Level Sensor |
| Year/Revision | Last Modified: 21-Dec-2010; troubleshooting section Last Modified: 11-Jun-2010 |
| Pages | 5 |
| 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
- FAULT CODE 1673 – Aftertreatment Diesel Exhaust Fluid Tank Level – Data Valid But Below Normal Operational Range – Most Severe Level
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes
- Guided Step 2 – Check ECM calibration and clear fault codes
- Guided Step 2B – Disable the fault code
Applicable truck models
This document applies to Cummins CM2250 engine families listed in the file: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250. The component location is OEM dependent because the diesel exhaust fluid tank and level sensor location varies by truck installation; the document directs technicians to the OEM service manual for tank and sensor location details. For brand information, visit the official Cummins website.
Who needs this Cummins 1673 DEF manual
Workshop owners, diesel mechanics, and fleet technicians need this file when a truck logs Fault Code 1673, SPN 1761 FMI 1, with an amber lamp, flashing diesel exhaust fluid lamp, and engine torque reduction. The procedure focuses on verifying active fault status, adding diesel exhaust fluid when the tank is critically low, checking whether an ECM calibration update is available, and clearing the code with INSITE™ electronic service tool after the diagnostic passes.
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