This Cummins 1665 fault code document is a troubleshooting PDF for Fault Code 1665 on Cummins ISB, ISC, and ISL aftertreatment temperature sensor circuits. It explains the aftertreatment diesel oxidation catalyst inlet temperature sensor signal, the amber CHECK ENGINE lamp action, disabled active regeneration, and guided checks using INSITE™ electronic service tool.
Official Cummins 1665 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; file group listed as ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment Temperature Sensors / DTCs |
| Year/Revision | Last Modified: 20-Jul-2010; year unknown |
| Pages | 12 |
| File size | 0.3 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 aftertreatment diesel oxidation catalyst inlet temperature sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with aftertreatment temperature sensor diagnostics, and the catalog group identifies ISB6.7 CM2150 (2007-09) / DTCs. The component covered is the aftertreatment diesel oxidation catalyst inlet temperature sensor located at the inlet of the aftertreatment catalyst; the extract directs technicians to the original equipment manufacturer troubleshooting and repair manual for component location details. For brand information, visit the Cummins official website.
Who needs this Cummins 1665 fault code manual
Workshop owners, diesel mechanics, and fleet technicians need this 1665 fault code manual when an engine logs SPN 3241 FMI 4/4 for low signal voltage at the catalyst inlet sensor circuit. The procedure helps separate connector damage, sensor faults, OEM harness shorts, and possible ECM action.
The diagnostic sequence checks inactive codes, inspects connector pins, verifies circuit response, and measures resistance for pin-to-pin and pin-to-ground shorts. It references Procedure 019-361 for component and connector pin inspection, Procedure 019-360 for resistance measurement using a multimeter, Procedure 019-071 for OEM Wiring Harness repair, Procedure 019-449 for Aftertreatment Exhaust Gas Temperature Sensor replacement, and Procedure 019-031 for Electronic Control Module authorization when earlier checks are completed.
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