This Cummins 1881 troubleshooting document is a fault-code diagnostic manual for the aftertreatment diesel particulate filter differential pressure sensor circuit. It explains Fault Code 1881, PID S324, SPN 3251, and FMI 4/4, where low signal voltage or an open circuit is detected by the ECM. The file is intended for step-by-step electrical checks using INSITE™ electronic service tool and a multimeter.
Official Cummins 1881 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; file group identifies ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment Differential Pressure / DTCs |
| Publication no. | Not specified in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 16 |
| File size | 0.3 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 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 controls, with the file classification naming ISB6.7 CM2150 (2007-09). The fault concerns the aftertreatment diesel particulate filter differential pressure sensor located in the aftertreatment system; exact vehicle placement is referred to the OEM troubleshooting and repair manual. The diagnostic runs continuously with the keyswitch ON and sets when the ECM detects the aftertreatment diesel particulate filter differential pressure signal voltage below 0.25-VDC for more than 1 second. Active aftertreatment diesel particulate filter regeneration will be disabled while the fault is active. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1881 troubleshooting manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when an amber CHECK ENGINE light is linked to Fault Code 1881 or related aftertreatment differential pressure sensor wiring checks. It is also useful when verifying ECM calibration, inspecting OEM harness connectors, checking 4.75 to 5.25-VDC sensor supply, measuring less than 10 ohms on harness circuits, and confirming greater than 100k ohms for short-circuit tests.
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