This document is a Cummins fault code 1663 troubleshooting PDF for the ISB6.7 CM2150 aftertreatment temperature sensor circuit. It explains the condition where catalyst inlet and outlet temperature sensor readings are swapped, causing active diesel particulate filter regeneration to be disabled.
Official Cummins fault code 1663 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL aftertreatment temperature sensors |
| System/Group | DTCs; aftertreatment temperature sensors |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010; Last Modified: 13-Jan-2011 |
| Pages | 8 |
| 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 – Monitor the aftertreatment diesel particulate filter temperature sensor with an electronic service tool.
- Guided Step 1C – Check for fault codes.
- Guided Step 2 – Clear the fault code.
- Guided Step 2A – Verify the repair.
- Guided Step 2B – Clear the fault codes.
Applicable truck models
This Cummins fault code 1663 document applies to engines identified in the file as ISB6.7 CM2150 (2007-09), with the extract also naming ISB, ISC, and ISL aftertreatment temperature sensors. Specific exhaust gas temperature sensor locations depend on the original equipment manufacturer, so the document directs technicians to the OEM troubleshooting and repair manual for component location. See the engine maker at Cummins official website.
Who needs this Cummins fault code 1663 manual
Mechanics and workshop owners need this manual when an amber CHECK ENGINE light appears with SPN 3241 FMI 11/31 and active aftertreatment diesel particulate filter regeneration is disabled. It supports checks with INSITE™ electronic service tool, ECM calibration review through QuickServe™ Online, harness short inspection, and sensor replacement decisions.
The troubleshooting flow first checks related sensor circuit fault codes including Fault Code 1674, 1675, 1676, 1665, 1666, or 1667. It then instructs the technician to idle the engine for more than 10 minutes, monitor the three aftertreatment diesel particulate filter temperature sensor readings, and compare whether any reading varies by more than 24°C [75°F]. If a sensor reads higher or lower than the other sensors, the file points to harness signal-pin short checks and replacement of the affected temperature sensor when no short is found.
The file also explains that the aftertreatment diesel oxidation catalyst inlet temperature sensor and the diesel particulate filter outlet temperature sensor share the same part number and electrical connections, while the diesel particulate filter inlet temperature sensor has a different connector key. For Cummins fault code 1663, the most likely cause stated is swapped or incorrectly installed temperature sensor connections at the OEM harness or in the aftertreatment system.
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