This Cummins 1691 fault code document is a troubleshooting manual for aftertreatment diesel oxidation catalyst conversion efficiency on CM2250 engines. It explains why Fault Code 1691 sets, what the ECM does when it is active, and which INSITE™ service tool procedures are used to verify and clear the condition.
Official Cummins 1691 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated procedures also list ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel oxidation catalyst conversion efficiency |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 15-Sep-2010; troubleshooting section Last Modified: 26-Jan-2011 |
| Pages | 15 |
| 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 – Check the exhaust system for leaks.
- Guided Step 3B – Inspect the aftertreatment diesel oxidation catalyst.
- Guided Step 4 – Check the aftertreatment fuel injector.
- Guided Step 5 – Check ECM calibration and clear fault
Applicable truck models
This file applies to Cummins CM2250 engine families listed in the procedure table, with the file information identifying ISB6.7 CM2250 coverage. The fault description concerns the aftertreatment diesel oxidation catalyst, the diesel particulate filter intake and outlet temperature sensors, active DPF regeneration, aftertreatment fuel injector flow, ECM calibration code checks, and the aftertreatment diesel particulate filter temperature sensor interface module. Component location can vary by OEM installation, so the document directs technicians to the OEM service manual for exact catalyst location. Official manufacturer information is available from Cummins.
Who needs this Cummins 1691 fault code manual
Workshop owners, diesel mechanics, and emissions technicians need this manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 100 FMI 18 and active regeneration is disabled. It supports structured checks for related temperature sensor faults, Fault Code 3167, exhaust leaks between the turbocharger and aftertreatment system, catalyst contamination, fuel injector operation, and ECM calibration status.
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