Cummins ISM code 698 is the Cummins ISM CM871 (2007-09) diagnostic reference for fault code 698, the ECM internal temperature sensor DTC that is set when the ECM internal temperature sensor circuit reads below normal or shorts to a low source. This 2-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 P21, SPN 1136, FMI 4, 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 | 698 — SPN 1136, FMI 4, PID P21 |
| Warning lamp | AMBER |
| Pages | 2 |
| 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 698 diagnosis
Fault code 698 is set when the ECM internal temperature sensor circuit reads below normal or shorts to a low source. The electronic control module has an internal temperature sensor that measures the temperature inside the ECM. Because the sensor is internal, no field troubleshooting is possible, and if this code is active the ECM must be replaced. 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:
- An internal fault in the ECM temperature sensor circuit.
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 698 manual
Diesel technicians, fleet mechanics, and workshop owners diagnosing the ECM internal temperature sensor on ISM CM871 engines will use this reference to read the fault identifiers correctly and follow the factory test sequence for code 698.
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