Cummins ISM code 1663 is the Cummins ISM CM871 (2007-09) diagnostic reference for fault code 1663, the aftertreatment temperature sensors DTC that is set when the exhaust gas temperature 1 sensors appear swapped. This 3-page PDF from the Cummins ISX and ISM Troubleshooting and Repair documentation lists the fault identifiers, component description, and step-by-step checks. It carries PID S326, SPN 3241, FMI 11/31, and lights Amber warning lamp.
Official document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 engines |
| System / group | ISM CM871 (2007-09) / DTCs |
| Fault code | 1663 — SPN 3241, FMI 11/31, PID S326 |
| Warning lamp | AMBER |
| Pages | 3 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, warning lamp)
- Description
- Shop Talk
- Component location
- Troubleshooting steps
Cummins ISM code 1663 diagnosis
Fault code 1663 is set when the exhaust gas temperature 1 sensors appear swapped. Three temperature sensors monitor the aftertreatment system. The code activates when the ECM finds that the diesel oxidation catalyst inlet and diesel particulate filter inlet temperature sensors are reading backwards, most often because those two sensors have been installed in each other’s locations. According to the Cummins Shop Talk guidance, technicians should first verify that the ECM calibration is correct and recalibrate if necessary before component replacement. Possible causes listed in the document include:
- The diesel oxidation catalyst inlet and particulate filter inlet temperature sensors installed in swapped positions.
- Harness routing that reverses the two sensor connections.
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09) engines and the closely related ISX CM871 platform used in on-highway trucks, so it suits heavy-duty tractors and vocational trucks fitted with these engines and their aftertreatment systems. Always confirm the engine dataplate and refer to the OEM troubleshooting and repair manual for chassis-specific pin numbers. Full specifications are published on the Cummins official website.
Who needs this Cummins ISM code 1663 manual
Diesel technicians, fleet mechanics, and workshop owners diagnosing the aftertreatment temperature sensors on ISM CM871 engines will use this reference to read the fault identifiers correctly and follow the factory test sequence for code 1663.
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