This code 731 DTCs document explains the Engine Speed/Position Camshaft and Crankshaft Misalignment fault and its diagnostic workflow. It covers Hall effect crankshaft and camshaft position sensors, ECM signal comparison, fault effects, repair validation, and guided troubleshooting steps for CM2250 engines.
Official code 731 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Magnetic Speed/Position Circuit |
| Publication no. | Associated bulletin numbers shown: 4022254, 4022257, 4022250, 2883445, 4022256, 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 20-Jan-2011 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 731 – Engine Speed/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding or Out of Adjustment
- 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 multiple fault codes
- Guided Step 2 – Inspect the tone wheels and speed/position sensors
- Guided Step 3 – Inspect the engine and vehicle grounding
- Guided Step 4 – Check the static timing
- Guided Step 5 – Check ECM calibration and clear fault codes
Applicable truck models
This file applies to Cummins CM2250 engine platforms listed in the procedure tables: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The fault concerns mismatch between crankshaft position sensor and camshaft position sensor signals, with possible causes including loose or misaligned engine speed sensor rings, tone wheel damage, grounding issues, incorrect static timing, ECM calibration concerns, and crankshaft gear slippage after other checks are completed. See the manufacturer source at Cummins official website.
Who needs this code 731 DTCs manual
Mechanics, fleet workshops, and diagnostic technicians need this manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 723 FMI 7/7 and symptoms such as hard start, rough idle, excessive smoke, or reduced engine performance. The procedure uses INSITE™ electronic service tool checks, visual inspection, static timing verification at top dead center, ECM calibration comparison, and fault clearing validation.
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