This Cummins 3229 troubleshooting manual covers Fault Code 3229 diagnostics for aftertreatment SCR intake temperature on CM2250 engines. The PDF explains the circuit, fault conditions, effects, associated procedures, guided checks, and clearing steps used with INSITE™ electronic service tool.
Official Cummins 3229 troubleshooting manual 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 Circuit |
| Publication no. | 4022254, 4022257, 4022250, 2883445 appear as associated bulletin numbers |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 13 |
| 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 the aftertreatment system.
- Guided Step 3 – Check the fuel system.
- Guided Step 5 – Check the aftertreatment fuel injector.
- Guided Step 6 – Inspect the aftertreatment diesel oxidation catalyst.
- Guided Step 7B – Disable the fault code.
Applicable truck models
This document applies to Cummins CM2250 engine families listed in the procedure table: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. It is written for Fault Code 3229, SPN 4360 FMI 0, where the aftertreatment SCR intake temperature sensor reading is valid but above the most severe operational range. The sensor is located between the diesel particulate filter and the SCR catalyst, and the ECM monitors the signal voltage to calculate exhaust temperature entering the SCR catalyst. For manufacturer information, visit the Cummins official website.
Who needs this Cummins 3229 troubleshooting manual
Workshop technicians, fleet maintenance teams, and diagnostic tool users need this Cummins 3229 troubleshooting manual when a red STOP ENGINE lamp, disabled diesel exhaust fluid injection, or possible engine shutdown is linked to SCR intake temperature above 800°C [1472°F] for more than 20 seconds. The procedure supports both active and inactive faults because the code can go inactive once SCR intake temperature drops below the warning limit.
The guided checks include active fault code review for Fault Codes 3142 through 3149, monitoring aftertreatment exhaust gas temperature sensors, checking DEF contamination, inspecting for oil or fuel entering the aftertreatment system, checking the aftertreatment fuel injector if equipped, inspecting the diesel oxidation catalyst for soot accumulation or cracked cell walls, verifying ECM calibration code status, and disabling or clearing the fault after validation. Full PDF available in the DiagTechPro manuals library, free account required to download.
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