This document is a Cummins ISB6.7 234 troubleshooting PDF for the Engine Crankshaft Speed/Position fault on CM2250 engines. It explains the overspeed condition, ECM response, possible causes, INSITE™ checks, calibration review, and fault clearing steps. The file is useful when a red STOP ENGINE lamp is linked to SPN 190 FMI 0/0.
Official Cummins ISB6.7 234 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, and other CM2220, CM2150, and CM876 engines in the associated procedures table. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Crankshaft Speed/Position Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated ECM procedures; other bulletin numbers are listed for other engine models. |
| Year/Revision | Last Modified: 11-Jun-2010 and 03-Jan-2011 |
| Pages | 9 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- 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 – Identify the reason for the overspeed.
- Guided Step 2 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies this procedure for Cummins ISB6.7 CM2250 and lists related CM2250 applications including ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and GX CM2250. It also includes associated ECM and ECM Calibration Code procedures for several other Cummins control module families, but the file information groups this PDF under ISB6.7 CM2250 DTCs. For official manufacturer information, visit Cummins.
Who needs this Cummins ISB6.7 234 manual
Workshop owners, diesel mechanics, fleet technicians, and diagnostic tool users need this manual when engine speed is reported above the protection limit and fueling is disabled until rpm returns to normal. It supports checks for downhill motoring, alternate fuel sources, turbocharger seal oil leaks, sensor tampering, engine brake harness faults, ECM replacement authorization, and ECM calibration updates.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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