This Cummins fault 3429 document is a troubleshooting manual for the aftertreatment diesel exhaust fluid line heater 4 circuit. It explains the current below normal or open circuit fault, the amber lamp response, torque reduction risk, and the INSITE™ checks used to validate repair. The file is Code 3429.pdf, supplied as a 13-page English PDF.
Official Cummins fault 3429 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 (2010-12); extract also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System/Group | DTCs; Aftertreatment Diesel Exhaust Fluid Line Heater 4 Circuit |
| Publication no. | Not specified in this file extract |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 13 |
| 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 4 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 manual applies to Cummins aftertreatment diagnostics for the ISB6.7 CM2250 group listed in the file information. The extract also names ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 in the fault-code header and associated procedure table. It covers Fault Code 3429, SPN 4346, FMI 5, where the aftertreatment diesel exhaust fluid controller detects an open circuit or short to ground in diesel exhaust fluid line heater 4. The line heater is internal to the aftertreatment diesel exhaust fluid dosing unit and cannot be serviced separately. Official manufacturer information is available from Cummins.
Who needs this Cummins fault 3429 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins fault 3429 manual when an amber CHECK ENGINE lamp or MIL is linked to DEF line heater 4 current below normal. It is useful when inspecting dosing unit connector pins, testing the controller harness supply and signal circuits, checking resistance limits, reviewing ECM calibration, and clearing the fault with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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