This 11-page PDF is the official Cummins ISB6.7 3649 3649 troubleshooting document covering the aftertreatment intake NOx sensor heater abnormal rate of change diagnostic. It provides circuit descriptions, conditions for setting and clearing the fault, and a complete guided troubleshooting procedure for CM2250-equipped engines.
Official Cummins ISB6.7 3649 3649 document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, GX CM2250 |
| System/Group | Aftertreatment / Diagnostic Trouble Codes (DTCs) |
| Publication no. | Not specified |
| Year/Revision | Last modified 27-Dec-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3649 — Aftertreatment Intake NOx Sensor Heater — Abnormal Rate of Change (SPN 5024, FMI 10)
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures Table (Procedure 019-032, 019-463)
- Guided Step 1 — Check the Fault Codes (1A, 1B, 1C)
- Guided Step 2 — Check the Aftertreatment Intake NOx Sensor Circuit (2A, 2B)
- Guided Step 3 — Check the OEM Harness (3A, 3B)
- Guided Step 4 — Check ECM Calibration and Clear Fault Codes (4A, 4B)
Applicable truck models
This document applies to Cummins CM2250-controlled engines including the ISB6.7, ISC8.3, ISL9, ISX15, ISX11.9, and GX platforms produced in the 2010–2012 era. The aftertreatment intake NOx sensor is mounted near the turbocharger turbine outlet on these engines. Related fault codes referenced in the troubleshooting tree include 1885, 3232, 3682, 3313, 3314, and 3315. The INSITE™ electronic service tool is required for several diagnostic steps, along with multimeter procedures described in Procedure 019-359. For further technical resources, visit Cummins official website.
Who needs this Cummins ISB6.7 3649 3649 manual
Diesel mechanics and workshop owners troubleshooting an amber CHECK ENGINE lamp triggered by a NOx sensor heater malfunction on CM2250 engines need this document. It walks through connector inspection, voltage measurement at the sensor supply and return circuits, OEM harness open-circuit checks, and ECM calibration verification — all organized as a decision-tree so technicians can isolate the root cause efficiently.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Related library topics: Cummins ISB6.7 fault code; aftertreatment intake NOx sensor heater; abnormal rate of change; Cummins; CM2250 troubleshooting; SPN 5024 FMI 10; ECM calibration procedure 019-032; NOx sensor procedure 019-463.
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