The Cummins ISM code 1879 service document is a 5-page PDF fault-code sheet that covers the Aftertreatment Particulate Filter Differential Pressure Sensor Circuit fault (code 1879) on Cummins ISM CM871 engines. It sets out the SPN, FMI and warning-lamp data, a plain-language description of the aftertreatment diesel particulate filter differential, and the step-by-step checks a technician follows to confirm, repair and clear the fault.
Official document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) / DTCs; ISX CM871 (2007-09) / DTCs |
| System / group | ISM CM871 (2007-09) / DTCs |
| Fault code | 1879 (PID S324, SPN 3251, FMI 3/3) |
| Warning lamp | Amber |
| Source | TruckFaultCodes reference, Copyright © 2017 |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
- Circuit Diagram
Applicable truck models
This fault-code sheet applies to Cummins ISM CM871 (2007-09) engines and, where noted in the document, the related ISX CM871 platform used in on-highway trucks fitted with the aftertreatment diesel particulate filter differential. Verify that the ECM calibration matches the engine before starting diagnosis. Current engine specifications and service policy are published on the Cummins official website.
Cummins ISM code 1879 troubleshooting steps
The electronic control module (ECM) provides a 5 volt supply to the aftertreatment diesel particulate filter differential pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The aftertreatment diesel particulate filter differential pressure sensor provides a signal to the ECM on the aftertreatment diesel particulate filter differential pressure sensor signal circuit. The troubleshooting routine walks through key-on diagnostic-tool checks, inspection of the aftertreatment diesel particulate filter differential, and verifying that the fault goes inactive after the repair. The sheet reports fault code 1879 with SPN 3251, FMI 3/3 and an amber lamp so the technician can confirm the right diagnostic tree.
Who needs this Cummins ISM code 1879 manual
Heavy-duty truck technicians and workshop owners diagnosing the aftertreatment diesel particulate filter differential on Cummins ISM CM871 engines need this reference. It documents the fault code 1879 conditions, likely causes and the checks required to close the repair correctly the first time.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
