This Cummins ISB vehicle speed manual is a 13-page Cummins fault-code document for diagnosing Fault Code 241 on CM2150 engines. It covers the wheel-based vehicle speed signal, vehicle speed sensor circuit behavior, ECM response, INSITE™ checks, OEM harness testing, and final code clearing.
Official Cummins ISB vehicle speed document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | Vehicle Speed Sensor Circuit / DTCs |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010; file year unknown |
| Pages | 13 |
| 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
- FAULT CODE 241 Wheel-Based Vehicle Speed – Data Erratic, Intermittent, or Incorrect
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the vehicle speed sensor setting in INSITE™ electronic service tool
- Guided Step 2 – Check the OEM harness
- Guided Step 3 – Check for additional OEM devices
- Guided Step 4 – Clear the fault codes
Applicable truck models
This document applies to Cummins ISB, ISC, and ISL engines with CM2150 control, including the ISB6.7 CM2150 (2007-09) group stated in the file data. The procedure concerns the vehicle speed sensor located at the rear of the vehicle transmission, and the extract directs technicians to the OEM troubleshooting and repair manual for transmission-mounted sensor details, gear or tone wheel repair, and components outside Cummins control such as magnetic pickup, data link, digital, and tachograph speed sources. For manufacturer support, visit Cummins official website.
Who needs this Cummins ISB vehicle speed manual
This ISB vehicle speed manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE light with Fault Code 241, PID P084, SPN 84, FMI 2/2. It helps confirm the speed-source setting in INSITE™ electronic service tool, inspect dirty or damaged pins, test OEM harness resistance, find opens or shorts, check for additional OEM devices, and verify the fault becomes inactive after the ECM reads vehicle speed.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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