This Cummins SCR fault 3145 document is a troubleshooting manual for the aftertreatment SCR intake temperature sensor circuit on CM2250 engines. It explains the abnormal rate of change fault, the lamp and derate effects, and the guided checks used with INSITE electronic service tool.
Official Cummins SCR fault 3145 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 SCR Intake Temperature Sensor |
| Publication no. | Associated bulletin numbers shown: 4022254, 4022257, 4022250, 2883445 |
| Year/Revision | Last Modified: 27-Dec-2010 |
| Pages | 15 |
| 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 for sensor circuit fault codes.
- Guided Step 2 – Check the SCR catalyst intake temperature sensor and circuit.
- Guided Step 3 – Check the aftertreatment SCR catalyst temperature sensor interface module.
- Guided Step 4 – Check the ECM and engine harness.
- Guided Step 5 – Disable the fault code.
Applicable truck models
This file covers Cummins CM2250 engine applications listed in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The procedure is for Fault Code 3145, PID S254, SPN 4360, FMI 10/10, where the Aftertreatment SCR Intake Temperature Sensor shows an Abnormal Rate of Change during active diesel particulate filter regeneration. The sensor is located in the aftertreatment system between the diesel particulate filter and the SCR catalyst. The ECM uses the signal to monitor exhaust temperature entering the SCR catalyst, and when the diagnostic fails it can illuminate the amber CHECK ENGINE lamp, disable diesel exhaust fluid injection, and reduce torque after extended operation. Manufacturer information is available at Cummins official website.
Who needs this Cummins SCR fault 3145 manual
Workshop owners, diesel technicians, fleet mechanics, and diagnostic tool users need this manual when checking SCR catalyst intake temperature sensor response, connector condition, harness continuity, ECM circuit response, or calibration status. It references Procedure 019-449 for the aftertreatment exhaust gas temperature sensor, Procedure 019-464 for the aftertreatment SCR catalyst temperature sensor interface module, Procedure 019-043 for the engine wiring harness, Procedure 019-031 for the ECM, and Procedure 019-032 for ECM calibration code checks.
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