This Cummins fault 3239 document is a troubleshooting manual for the aftertreatment diesel exhaust fluid line heater 2 circuit. It explains the voltage above normal or shorted to high source condition, the active fault effects, clearing requirements, and guided diagnostic checks using INSITE™ electronic service tool.
Official Cummins fault 3239 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 2 circuit |
| Publication no. | Associated bulletin numbers shown: 4022254, 4022257, 4022250, 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 10 |
| 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 file applies to Cummins CM2250 engine diagnostic coverage shown in the extract: ISB6.7 CM2250, ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. The described component is aftertreatment diesel exhaust fluid line heater 2, located on the return line between the dosing unit and the diesel exhaust fluid tank. For manufacturer information, visit the Cummins official website.
Who needs this Cummins fault 3239 manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE lamp or MIL related to the aftertreatment diesel exhaust fluid line heater 2 circuit. It is useful when checking connector damage, line heater resistance, pin-to-pin shorts in the 86-pin controller harness connector, ECM calibration status, and fault clearing with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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