This Cummins fault code 731 PDF is the official Engine Speed and Camshaft Position Sensor Misalignment troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID S064, SPN 723, FMI 7/7 and the Amber warning lamp. It is a step-by-step diagnostic flow, not a general manual, and it takes a technician from symptom to confirmed repair on this specific code.
Cummins fault code 731 explained
The engine speed sensor and camshaft position sensor supply engine speed and position signals to the ECM through the engine harness, and this code flags a mechanical misalignment between the camshaft and crankshaft sensors. Both sensors reference the engine gear train, so the chart begins with a physical inspection of the sensors before any part is replaced. Possible causes include loose, missing or corroded grounds, damaged tone wheel teeth, a loose crankshaft tone wheel, mis-set static timing, front gear train slippage, a misoriented sensor, or electrical noise.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Engine Speed and Camshaft Position Sensor Misalignment |
| Fault identifiers | Fault Code 731, PID S064, SPN 723, FMI 7/7, Amber lamp |
| Source / Revision | TruckFaultCodes.com, Copyright 2017 |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Fault code verification and clearing
Applicable truck models
This chart applies to on-highway trucks and equipment built on the Cummins ISM, ISX and Signature CM570 (1999-02) engines with the CM570 electronic control module. Because component and battery locations vary by chassis maker, the document repeatedly refers you to the OEM manual for exact positions. For engine specifications and dealer support, see the official Cummins engine site.
Who needs this Cummins fault code 731 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Engine Speed and Camshaft Position Sensor Misalignment correctly instead of guessing at parts. It pairs with a diagnostic scan tool and standard shop meters.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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