Cummins ISM code 731 is the Cummins ISM CM871 (2007-09) diagnostic reference for fault code 731, the engine magnetic speed/position sensors DTC that is logged when the camshaft and crankshaft position sensors indicate a mechanical misalignment. 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 S064, SPN 723, FMI 7/7, 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 | 731 — SPN 723, FMI 7/7, PID S064 |
| 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 731 diagnosis
Fault code 731 is logged when the camshaft and crankshaft position sensors indicate a mechanical misalignment. The crankshaft and camshaft position sensors are hall-effect types fed 5 VDC by the ECM. The ECM monitors the missing tooth on the crankshaft target and the camshaft target, and sets this code when those two positions do not match. 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:
- A mechanical misalignment between the crankshaft and camshaft position sensor targets.
- Incorrect gear or sensor timing/adjustment.
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 731 manual
Diesel technicians, fleet mechanics, and workshop owners diagnosing the engine magnetic speed/position sensors on ISM CM871 engines will use this reference to read the fault identifiers correctly and follow the factory test sequence for code 731.
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