This document is a Cummins 3258 fault code troubleshooting manual for the aftertreatment diesel exhaust fluid line heater 1 circuit. It explains the circuit description, fault conditions, diagnostic steps, connector inspections, resistance checks, ECM calibration review, and fault clearing process used with INSITE™ electronic service tool.
Official Cummins 3258 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 in the procedure coverage |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid line heater 1 circuit |
| Publication no. | Not shown in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 21-Dec-2010; troubleshooting procedure page shows Last Modified: 11-Jun-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
- 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 fault codes.
- Guided Step 2 – Check the aftertreatment diesel exhaust fluid line heater 1 and circuit.
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins engines and aftertreatment systems listed in the extract: ISB6.7 CM2250, ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. The fault is for SPN 4340 FMI 5/5, described as “Aftertreatment Diesel Exhaust Fluid Line Heater 1 Circuit – Current Below Normal or Open Circuit,” where the controller detects an open circuit or short to ground and disables diesel exhaust fluid line heater 1. See the official manufacturer site at Cummins.
Who needs this Cummins 3258 fault code manual
Workshop owners, diesel mechanics, fleet technicians, and aftertreatment diagnostic specialists need this 3258 fault code file when checking DEF line heater relay faults, harness continuity, controller connectors, fuses, and ECM calibration status. It is written as a guided diagnostic workflow using INSITE™ electronic service tool and OEM wiring information.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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