The Cummins ISM code 1922 service document is a 6-page PDF fault-code sheet that covers the Aftertreatment Diesel Particulate Filter Differential Pressure fault (code 1922) on Cummins ISM CM871 engines. It sets out the SPN, FMI and warning-lamp data, a plain-language description of the aftertreatment system, 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 | 1922 (PID S324, SPN 3251, FMI 0/0) |
| Warning lamp | Red |
| Source | TruckFaultCodes reference, Copyright © 2017 |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
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 system. 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 1922 troubleshooting steps
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter. Under normal operating conditions, the aftertreatment diesel particulate filter is self-cleaning, where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment diesel particulate filter. The troubleshooting routine walks through key-on diagnostic-tool checks, inspection of the aftertreatment system, and verifying that the fault goes inactive after the repair. The sheet reports fault code 1922 with SPN 3251, FMI 0/0 and a red lamp so the technician can confirm the right diagnostic tree.
Who needs this Cummins ISM code 1922 manual
Heavy-duty truck technicians and workshop owners diagnosing the aftertreatment system on Cummins ISM CM871 engines need this reference. It documents the fault code 1922 conditions, likely causes and the checks required to close the repair correctly the first time.
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