This fault code 3321 DTCs document is a troubleshooting procedure for the aftertreatment diesel particulate filter outlet temperature sensor circuit. It explains a voltage-below-normal or short-to-low-source condition, the fault effects, diagnostic conditions, and guided checks using INSITE™ electronic service tool.
Official fault code 3321 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the associated procedures table. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Particulate Filter Outlet Temperature Sensor Circuit |
| Publication no. | Not shown as a single publication number in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255. |
| Year/Revision | Last Modified: 11-Jun-2010 and 07-Dec-2010 |
| Pages | 18 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3321
- 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 1A – Check for inactive fault codes.
- Guided Step 2 – Check the aftertreatment diesel particulate filter outlet temperature sensor and circuit.
- Guided Step 3 – Check the aftertreatment DPF temperature sensor interface module.
- Guided Step 4. Check the ECM and OEM harness.
- Guided Step 5. Check ECM calibration and clear fault codes.
Applicable truck models
The procedure is listed for Cummins CM2250 engine platforms, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. It covers SPN 3246 FMI 4, where the ECM detects less than 0.1-VDC for more than 2 seconds on the aftertreatment diesel particulate filter outlet temperature signal circuit. The component is located at the outlet of the aftertreatment diesel particulate filter, with final vehicle-location details referred to the OEM service manual. For manufacturer information, visit Cummins official website.
Who needs this fault code 3321 DTCs manual
This manual is intended for technicians diagnosing aftertreatment temperature sensor faults, disabled active or stationary DPF regeneration, amber CHECK ENGINE lamp events, MIL operation on OBD engines, EGR valve closure, or torque reduction tied to this circuit. Workshop owners can use it to verify the test path before replacing the aftertreatment gas temperature sensor, the aftertreatment DPF temperature sensor interface module, the OEM harness, or updating the ECM calibration.
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