This Cummins 1694 troubleshooting manual covers Fault Code 1694 for the aftertreatment outlet NOx sensor on CM2250 engines. It explains the circuit description, fault conditions, possible causes, guided checks, sensor decisions, and fault clearing with INSITE™ electronic service tool. The file is a 10-page English PDF for workshop diagnostics and service reference.
Official Cummins 1694 troubleshooting 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 outlet NOx sensor circuit |
| Publication no. | 4022254, 4022257, 4022250, 2883445 listed in associated procedures |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Fault Code 1694: Aftertreatment Outlet NOx Sensor – Data Erratic, Intermittent, or Incorrect
- 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 aftertreatment diesel exhaust fluid decomposition tube
- Guided Step 3 – Verify the condition of the aftertreatment NOx sensors
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
This document applies to Cummins CM2250 engine families named in the procedure tables: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250. The diagnostic is for Fault Code 1694, PID P2201, SPN 3226, FMI 2, with an amber lamp condition and disabled aftertreatment outlet NOx sensor operation. It addresses SCR outlet NOx measurement, J1939 communication between the smart sensor and ECM, DEF decomposition tube crystallization, aftertreatment intake and outlet NOx sensor checks, and ECM calibration review. See the manufacturer at Cummins official website.
Who needs this Cummins 1694 troubleshooting manual manual
This 1694 troubleshooting manual is useful for diesel technicians, fleet maintenance teams, and workshop owners diagnosing erratic or incorrect outlet NOx data after an Aftertreatment Diesel Particulate Filter Regeneration Test. It helps decide when to inspect for exhaust leaks or DEF deposits, troubleshoot related active fault codes, replace the aftertreatment intake NOx sensor or aftertreatment outlet NOx sensor, and confirm repair completion through fault clearing steps.
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