This fault code 1993 DTCs document is a troubleshooting guide for the aftertreatment diesel particulate filter missing condition on CM2250 engines. It explains how the ECM monitors DPF differential pressure, when the amber CHECK ENGINE lamp is used, and why active or stationary regeneration can be disabled.
Official fault code 1993 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and GX CM2250 where listed in the associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; engine aftertreatment system and aftertreatment diesel particulate filter diagnostics |
| Year/Revision | Last Modified: 11-Jun-2010 and 06-Dec-2010 |
| Pages | 9 |
| File size | 0.2 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 – Inspect the aftertreatment diesel particulate filter differential pressure.
- Guided Step 3 – Check the presence of the aftertreatment diesel particulate filter.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies engine and ECM coverage rather than chassis names. The main model group is ISB6.7 CM2250, with associated procedures also listed for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and GX CM2250. It applies to vehicles using an OEM-installed aftertreatment particulate filter in the exhaust system. For manufacturer information, visit the Cummins official website.
Who needs this fault code 1993 DTCs manual
Workshop technicians need this fault code 1993 DTCs manual when a truck reports SPN 4795 FMI 31 and the aftertreatment diesel particulate filter is suspected to be missing, removed, cracked, broken, or bypassed. It is also useful for owners checking INSITE fault status, DPF differential pressure sensor tubes, ECM calibration revision, and repair validation after exhaust aftertreatment work.
The procedure directs the technician to check for active fault codes 1879, 1881, or 1883, then inspect the aftertreatment diesel particulate filter differential pressure sensor tubes for leaks, cracks, loose fittings, missing or broken tubes, plugged tubes, and backward connections at the rubber tubes near the sensor. It then calls for inspection of the aftertreatment system for tampering or removal, installation of the correct aftertreatment system when required, and ECM calibration comparison using the Calibration Information section of System ID and Dataplate in INSITE. Clearing requires elevated exhaust flow; the engine may need high idle operation for 1 minute, with at least 30 seconds of adequate exhaust flow, or road operation on some applications.
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