This document is a Cummins 3253 fault code troubleshooting manual for aftertreatment diesel particulate filter intake temperature faults. It explains the circuit description, fault logic, ECM actions, possible causes, guided diagnostic steps, repair checks, and clearing procedure for Code 3253.
Official Cummins 3253 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel particulate filter intake temperature sensor circuit. |
| Publication no. | Not stated as a single document number. Associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255. |
| Year/Revision | Year unknown; extract shows Last Modified: 11-Jun-2010 and 08-Dec-2010. |
| Pages | 14 |
| 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 1A – Check for active aftertreatment fault codes.
- Guided Step 1B – Monitor the aftertreatment exhaust gas temperature sensors.
- Guided Step 3A – Inspect the turbocharger exhaust outlet for oil or fuel.
- Guided Step 4A – Check the operation of the aftertreatment fuel injector (if equipped).
- Guided Step 5B – Inspect the aftertreatment diesel oxidation catalyst for cracks in the cell wall.
- Guided Step 6B – Disable the fault code.
Applicable truck models
This file applies to Cummins CM2250 engine platforms named in the extract, with primary file grouping under ISB6.7 CM2250 and additional associated procedure coverage for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The fault is SPN 3242 FMI 16, described as aftertreatment diesel particulate filter intake temperature data valid but above normal operating range at a moderately severe level. For official manufacturer information, visit Cummins.
Who needs this Cummins 3253 fault code manual
Workshop technicians, fleet mechanics, and diesel diagnostic shops need this manual when a red STOP ENGINE lamp appears and INSITE™ shows Fault Code 3253. The procedure is useful for checking temperature sensor behavior, injector-related unburned fuel issues, turbocharger outlet oil or fuel contamination, aftertreatment fuel injector leakage, diesel oxidation catalyst face plugging, SCR catalyst inspection, ECM calibration code updates, and final fault clearing.
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