This Cummins fault 1879 document is a troubleshooting procedure for the aftertreatment particulate filter differential pressure sensor circuit. It explains the high signal voltage condition, the amber CHECK ENGINE lamp response, and the checks needed before clearing the code. The PDF is listed as Code 1879.pdf and contains 15 pages.
Official Cummins fault 1879 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment Diesel Particulate Filter Differential Pressure Sensor; DTCs |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 1879
- 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 particulate filter differential pressure sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This procedure applies to Cummins ISB, ISC and ISL engines with CM2150 control, including the listed ISB6.7 CM2150 (2007-09) coverage. The document concerns Fault Code 1879, PID S324, SPN 3251, FMI 3/3, where the ECM detects aftertreatment diesel particulate filter differential pressure signal voltage greater than 4.75-VDC for more than 1 second. For exact aftertreatment system component location, the document directs the technician to the original equipment manufacturer troubleshooting and repair manual. Manufacturer information is available from Cummins official website.
Who needs this Cummins fault 1879 manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an active or inactive Cummins fault 1879 on CM2150-equipped engines. It supports inspection of sensor connectors, supply voltage, return circuits, ECM connector pins, OEM harness opens, and pin-to-pin shorts using INSITE™ electronic service tool and a multimeter.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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