This Cummins 3148 troubleshooting manual is a fault code diagnostic document for the aftertreatment SCR outlet temperature sensor circuit. It explains Fault Code 3148, SPN 4363 FMI 2, where the SCR catalyst outlet temperature sensor data is erratic, intermittent, or incorrect. The PDF is intended for service work using Cummins INSITE™ and standard electrical checks.
Official Cummins 3148 troubleshooting manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment SCR Outlet Temperature Circuit |
| Year/Revision | Last modified 11-Jun-2010 and 02-Dec-2010; year unknown |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 3148
- 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 aftertreatment SCR catalyst outlet 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 5B – Disable the fault code.
Applicable truck models
This document applies to Cummins CM2250 engine platforms listed in the procedure tables, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The diagnostic concerns the aftertreatment SCR catalyst outlet temperature sensor, the SCR catalyst temperature sensor interface module, the ECM, the engine wiring harness, and related calibration checks. For manufacturer information, visit the Cummins official website.
Who needs this Cummins 3148 troubleshooting manual manual
Workshop owners, diesel mechanics, and fleet technicians need this 3148 troubleshooting manual when an amber CHECK ENGINE lamp or MIL is linked to Fault Code 3148. It supports connector inspection, resistance testing, circuit response checks, ECM harness inspection, calibration review, and final fault clearing with INSITE™.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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