This Cummins 3256 troubleshooting document is a fault-code diagnostic procedure for aftertreatment diesel particulate filter outlet temperature on CM2250 engines. It explains Fault Code 3256, SPN 3246 FMI 15, the sensor circuit, diagnostic conditions, repair validation, and guided checks using INSITE™ electronic service tool.
Official Cummins 3256 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated procedure references also listing ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Particulate Filter Outlet Temperature Sensor Circuit |
| Publication no. | Not stated in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 07-Dec-2010; summary section also shows 11-Jun-2010 |
| Pages | 14 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3256 – Aftertreatment Diesel Particulate Filter Outlet Temperature – Data Valid But Above Normal Operating Range – Least Severe Level
- 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
- STEP 1. Check the aftertreatment system.
- STEP 2. Check the fuel system.
- Guided Step 3A – Inspect the turbocharger exhaust outlet for oil or fuel.
- Guided Step 4 – Check 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 diagnostics where Fault Code 3256 is used for aftertreatment diesel particulate filter outlet temperature above the engine protection warning limit. The file information identifies ISB6.7 CM2250, and the associated procedures table also names ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engine model coverage. The procedure references OEM service manual location information for the aftertreatment diesel particulate filter outlet temperature sensor, so vehicle-specific component access must be checked against the truck builder service literature. For official brand information, visit Cummins official website.
Who needs this Cummins 3256 troubleshooting manual
Workshop technicians, fleet maintenance staff, and diesel diagnostic specialists need this Cummins 3256 troubleshooting manual when active and stationary aftertreatment diesel particulate filter regeneration is disabled by high DPF outlet temperature logic. It is useful when checking INSITE™ fault status, comparing three aftertreatment exhaust gas temperature sensors, inspecting injectors, looking for oil or fuel in the turbocharger exhaust outlet, checking aftertreatment fuel injector operation, inspecting the diesel oxidation catalyst, and confirming ECM calibration revision.
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