This document is a fault code 3422 DTCs troubleshooting procedure for the aftertreatment diesel exhaust fluid line heater 3 circuit. It explains the voltage above normal or shorted to high source condition, the amber lamp response, the disabled heater effect, and the checks needed to confirm repair with INSITE™ electronic service tool.
Official fault code 3422 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Line Heater 3 Circuit |
| Publication no. | Not stated for this file; associated bulletin numbers include 4022254, 4022257, 4022250, and 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 3 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 applications identified in the procedure tables: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The specific component is the aftertreatment diesel exhaust fluid line heater 3, located on the suction line between the diesel exhaust fluid tank and diesel exhaust fluid dosing unit. See the manufacturer information at Cummins official website.
Who needs this fault code 3422 DTCs manual
Workshop technicians, fleet maintenance teams, and diagnostic tool users need this manual when a truck reports Fault Code 3422 with SPN 4344 FMI 3. The procedure covers connector inspection, line heater resistance measurement, controller harness pin-to-pin short testing, ECM calibration review, and final fault clearing.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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