This fault code 1664 DTCs document is a troubleshooting PDF for a catalyst missing condition on Cummins aftertreatment systems. It explains how the ECM uses aftertreatment temperature sensors during active regeneration to detect whether the diesel oxidation catalyst is present. The file also gives guided checks, INSITE™ service tool actions, and repair verification steps.
Official fault code 1664 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL CM2150 engines |
| System/Group | DTCs; aftertreatment temperature sensors; diesel oxidation catalyst; diesel particulate filter |
| Publication no. | Not specified in the file extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 6 |
| 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 for sensor circuit fault codes.
- Guided Step 1A – Check for fault codes.
- Guided Step 1B – Check for the presence of a diesel oxidation catalyst.
- Guided Step 2 – Clear the fault code.
- Guided Step 2A – Verify the repair.
- Guided Step 2B – Clear the fault codes.
Applicable truck models
This procedure applies to Cummins ISB6.7 CM2150 coverage in the file information and to the ISB, ISC, and ISL CM2150 engine references shown in the extracted troubleshooting steps. It is used where the aftertreatment system has a diesel oxidation catalyst, diesel particulate filter, aftertreatment temperature sensors, and ECM-controlled active regeneration. The document directs technicians to OEM troubleshooting and repair manuals for exact catalyst location because the exhaust system layout can vary by original equipment manufacturer. For manufacturer information, visit Cummins official website.
Who needs this fault code 1664 DTCs manual
This manual is useful for diesel mechanics, fleet workshops, and truck repair businesses diagnosing SPN 3050 FMI 11/31 with an amber CHECK ENGINE light and disabled active aftertreatment regeneration. It helps confirm whether related sensor circuit fault codes are active, whether the diesel oxidation catalyst is present, and whether the repair clears after a stationary regeneration test using INSITE™.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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