This Cummins ISB fault 1921 document is an 8-page diagnostic troubleshooting sheet for an aftertreatment diesel particulate filter differential pressure fault. It explains the circuit description, fault effects, soot loading stages, and guided service steps for confirming active codes, checking duty cycle, performing stationary regeneration, and clearing inactive codes.
Official Cummins ISB fault 1921 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL CM2150 engines; file listing identifies ISB6.7 CM2150 (2007-09) |
| System/Group | ISB, ISC, and ISL – Aftertreatment System / DTCs |
| Year/Revision | Last Modified: 09-Aug-2010; model year unknown |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 1921
- 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
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the duty cycle of the application.
- Guided Step 3 – Perform the stationary regeneration procedure.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL CM2150 engines with an aftertreatment diesel particulate filter installed in the exhaust system by the original equipment manufacturer. The file information specifically lists ISB6.7 CM2150 (2007-09), while the document text also references ISB CM2150, ISC CM2150, and ISL CM2150 service manual procedures, including Procedure 014-013 for stationary regeneration and Procedure 019-032 for ECM calibration. For official manufacturer information, visit Cummins.
Who needs this Cummins ISB fault 1921 manual
Mechanics and workshop owners need this manual when the amber CHECK ENGINE light is illuminated, the aftertreatment diesel particulate filter lamp is flashing, and engine torque or speed derate is active. It is also useful when INSITE™ electronic service tool checks show Fault Code 1921, SPN 3251, FMI 0/16, or when a stationary regeneration decision must be made after checking duty cycle and other active fault codes.
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