This fault code 3425 DTCs document is a troubleshooting procedure for the aftertreatment diesel exhaust fluid line heater 3 circuit on ISB6.7 CM2250 engines. It covers fault-code checks, connector inspection, circuit resistance tests, ECM calibration review, and fault clearing with INSITE™ electronic service tool.
Official fault code 3425 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated procedure table also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 references |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid line heater 3 circuit |
| Publication no. | 4022254 |
| Year/Revision | Last Modified: 31-Dec-2010 |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE 3425 – Aftertreatment Diesel Exhaust Fluid Line Heater 3 Circuit – Current Below Normal or Open Circuit
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes
- Guided Step 2 – Check the aftertreatment diesel exhaust fluid line heater 3 and circuit
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness
- Guided Step 4A – Check if an ECM calibration update is available
- Guided Step 4B – Disable the fault code
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Conditions for Clearing the Fault Code
- Shop Talk
Applicable truck models
This PDF applies to Cummins ISB6.7 CM2250 engines in the DTC group shown for 2010-12 coverage. The associated procedure table references Procedure 011-057 for the aftertreatment diesel exhaust fluid controller and Procedure 019-032 for ECM Calibration Code, with bulletin 4022254 listed for ISB6.7 CM2250 and other bulletin references for ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250. For official manufacturer information, visit Cummins official website.
Who needs this fault code 3425 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this manual when diagnosing an amber-lamp aftertreatment diesel exhaust fluid line heater 3 circuit fault. The procedure is useful when checking for inactive faults, active diesel exhaust fluid line heater relay faults, multiple line heater faults, damaged connector pins, open circuits, shorts to ground, blown fuse conditions, or a malfunctioning aftertreatment diesel exhaust fluid controller.
The diagnostic path uses keyswitch ON and OFF conditions, INSITE™ electronic service tool fault-code reads, visual connector checks, and resistance measurements such as less than 10 ohms for supply and signal circuit continuity and greater than 100k ohms for a pin-to-ground short check. The overview states that line heater 3 is controlled by the aftertreatment diesel exhaust fluid controller and receives power through the switch side of the diesel exhaust fluid line heater relay. The component is located on the suction line between the diesel exhaust fluid tank and diesel exhaust fluid dosing unit. Possible causes listed include a malfunctioning line heater relay, malfunctioning line heater, open circuit, short circuit to ground, blown fuse in the controller harness, or malfunctioning controller. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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