This Cummins 3231 troubleshooting manual is a diagnostic document for Fault Code 3231 and the aftertreatment SCR intake temperature circuit. It explains the code reason, sensor location, diagnostic conditions, failure effects, clearing conditions, and guided troubleshooting steps for workshop use. The file is Code 3231.pdf, supplied as a 15-page English PDF.
Official Cummins 3231 troubleshooting manual document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment SCR Intake Temperature Sensor Circuit |
| Publication no. | Not specified in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Year unknown; last modified 11-Jun-2010 and 04-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
- Fault Code 3231 – Aftertreatment SCR Intake Temperature – Data Valid But Above Normal Operating Range – Moderately Severe Level
- 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 aftertreatment system
- Guided Step 2 – Check the diesel exhaust fluid (DEF) for contamination
- Guided Step 4 – Check the turbocharger outlet
- Guided Step 6 – Inspect the aftertreatment diesel oxidation catalyst
- ECM Calibration
Applicable truck models
This document applies to Cummins CM2250 engine platforms listed in the extract, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The diagnostic covers the aftertreatment system where the SCR intake temperature sensor is located between the diesel particulate filter and the SCR catalyst, and where the ECM monitors exhaust temperature entering the SCR catalyst. See the manufacturer’s official information at Cummins official site.
Who needs this Cummins 3231 troubleshooting manual manual
This file is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing SPN 4360 FMI 16, a red STOP ENGINE lamp, disabled diesel exhaust fluid injection, or suspected high SCR catalyst intake temperature. It supports checks for related aftertreatment temperature sensor faults, contaminated DEF, injector misfire, oil or fuel at the turbocharger outlet, black smoke, diesel oxidation catalyst soot blockage, and ECM calibration status.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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