This document is a fault code 1691 DTCs troubleshooting PDF for aftertreatment catalyst efficiency diagnostics. It covers Fault Code 1691, SPN 3250, FMI 13/13, and the guided checks used when the diesel oxidation catalyst temperature rise is lower than expected during active regeneration.
Official fault code 1691 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; ISB6.7 CM2150 (2007-09) group listing |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs; ISB, ISC, and ISL – Aftertreatment System |
| Year/Revision | Year unknown; Last Modified: 15-Sep-2010 and 20-Jul-2010 |
| Pages | 13 |
| 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 fault codes.
- Guided Step 2 – Check the turbocharger outlet.
- Guided Step 3 – Check the exhaust system for leaks.
- Guided Step 4 – Check for excessive smoke.
- Guided Step 5 – Inspect the aftertreatment diesel oxidation catalyst.
- Guided Step 6 – Perform a stationary regeneration
- Guided Step 7 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines in the aftertreatment system coverage shown in the document, including the ISB6.7 CM2150 (2007-09) DTC group. The OEM location of the aftertreatment diesel oxidation catalyst can vary, so the document directs technicians to the OEM service manual for catalyst location details. For official manufacturer resources, visit Cummins official website.
Who needs this fault code 1691 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 1691 DTCs manual when active aftertreatment diesel particulate filter regeneration is disabled by an amber CHECK ENGINE event. It helps separate DOC face plugging, oil or fuel contamination, exhaust leaks, excessive black smoke, cracked catalyst cells, temperature sensor related faults, and ECM calibration issues.
The troubleshooting flow uses INSITE™ electronic service tool checks for related EGR valve or VGT operation fault codes, active Fault Code 1691 status, Aftertreatment Diesel Particulate Filter Regeneration Test, Aftertreatment Maintenance Reset, and DOC Reset. It also references ISB CM2100 and CM2150 Service Manual, Bulletin 4021578, ISC and ISL CM2150 Service Manual, Bulletin 4021569, Procedure 011-049, Procedure 014-013, and Procedure 019-032 where additional service procedures are required.
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