The Cummins fault code 3149 troubleshooting guide is the official Cummins diagnostic procedure for Aftertreatment SCR Outlet Temperature Sensor – Abnormal Rate of Change on the ISX11.9 CM2250 engine platform. This 16-page PDF documents the circuit description, the conditions that set and clear the fault, and the guided steps a technician follows to isolate and repair it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 |
| System / Group | Aftertreatment SCR Outlet Temperature Sensor |
| Fault code | 3149 (SPN 4363, FMI 10/10) |
| Warning lamp | Red |
| Pages | 16 |
| File size | 0.2 MB |
| Format | |
| Language | English |
| Last revised | 11-Jun-2010 |
Cummins fault code 3149 contents
- Overview and circuit description
- Component location
- 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 and guided troubleshooting steps
Fault meaning and symptoms
The document defines fault code 3149 as Aftertreatment SCR Outlet Temperature Sensor – Abnormal Rate of Change. The SCR outlet temperature sensor is used by the electronic control module (ECM) to monitor the engine exhaust temperature exiting the SCR catalyst. The ECM monitors the voltage on the signal pin and converts this to a temperature value. The condition is monitored on SPN 4363, FMI 10/10, and is annunciated with a red STOP ENGINE warning lamp. Documented causes in the Shop Talk section include stuck in-range scr catalyst outlet temperature sensor reading, high resistance in the scr catalyst outlet temperature sensor signal or return lines, malfunctioning aftertreatment scr catalyst temperature sensor interface module. Each fault is worked with the INSITE electronic service tool, cross-referencing associated procedures 019-031, 019-032, 019-043, 019-464, 019-361, 019-071, 019-360.
Applicable truck models
This procedure covers Cummins ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 engines built for the 2010-12 on-highway emissions platform, so it suits Class 8 trucks and vocational chassis running these engines. Confirm the exact application and current calibration against the official Cummins website before ordering parts.
Who needs this Cummins fault code 3149 manual
Diesel technicians and workshop owners who read 3149 on the INSITE service tool use this manual to follow the factory-approved diagnostic tree instead of replacing parts by guesswork. It is equally useful for fleet maintenance staff verifying a repair before returning a truck to service.
The full PDF is available in the DiagTechPro manuals library, a free account is required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
