This fault code 3261 DTCs document is a troubleshooting manual for the aftertreatment diesel exhaust fluid line heater 2 circuit. It explains the code reason, diagnostic conditions, repair validation, INSITE tests, connector checks, harness resistance checks, ECM calibration review, and fault clearing steps. The file is supplied as a 15-page English PDF for workshop reference.
Official fault code 3261 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid line heater 2 circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 31-Dec-2010; troubleshooting section 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 2 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 PDF applies to Cummins ISB6.7 CM2250 engines and documents Fault Code 3261, SPN 4342, FMI 5/5 for the aftertreatment diesel exhaust fluid line heater 2 circuit. The associated procedures table also lists the same controller and ECM calibration procedures for ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 engines, with bulletin numbers 4022257, 4022250, and 2883445. Official manufacturer information is available from Cummins.
Who needs this fault code 3261 DTCs manual
Mechanics, diesel diagnostic technicians, and workshop owners need this fault code 3261 DTCs manual when diagnosing an amber CHECK ENGINE lamp or MIL caused by an open circuit or short to ground in DEF line heater 2. It supports practical fault isolation by checking relay faults, multiple heater faults, dirty or damaged connector pins, harness continuity, pin-to-ground shorts, and ECM calibration level.
The diagnostic describes the aftertreatment diesel exhaust fluid line heater 2 as being controlled by the aftertreatment diesel exhaust fluid controller and powered through the switch side of the diesel exhaust fluid line heater relay. It states that the heater is located on the return line between the DEF dosing unit and DEF tank. Possible causes include a malfunctioning line heater relay, malfunctioning line heater, open circuit, short to ground, blown fuse in the controller harness, or malfunctioning controller.
Guided checks use INSITE™ electronic service tool to read fault codes and perform the Diesel Exhaust Fluid Doser System Heater Test. The procedure includes resistance specifications such as less than 10 ohms for harness circuit checks and greater than 100k ohms for a pin-to-ground short check. Repair validation requires a key cycle and heater test; the fault becomes inactive when the three line heaters are commanded on and the diagnostic runs and passes.
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