This document is a Cummins overcrank protection fault manual for Fault Code 3737 on CM2250 engines. It explains the starter lockout condition, the ECM-controlled protection logic, INSITE fault-code checks, calibration review, and clearing steps. The file is a short Cummins troubleshooting PDF intended for service use, not a general starter repair guide.
Official Cummins overcrank protection fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 6 |
| File size | 0.2 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 – Check the fault codes.
- Guided Step 1A – Check for active fault codes.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
The extract identifies coverage for ISB6.7 CM2250 and the heading also names ISC8.3 and ISL9 CM2250 under Engine Starter Mode Overcrank Protection. The associated procedure table lists ECM Calibration Code references for ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250, with bulletin numbers 4022254, 4022257, 2883445, 4022256, and 4022255. For manufacturer information, visit Cummins official website.
Who needs this Cummins overcrank protection fault manual
Mechanics, fleet technicians, and workshop owners need this Cummins overcrank protection fault manual when Fault Code 3737 appears after excessive cranking or repeated start attempts. The procedure helps confirm whether the code is information only, whether 10 or more inactive counts are stored, and whether an ECM calibration update should be checked before clearing the code.
The document states that the ECM temporarily disables starter operation to prevent starter motor damage and may flash the Wait to Start lamp, if equipped, during the cool-down period. INSITE™ electronic service tool is used to read active and inactive fault codes, compare ECM code and revision number with ECM Calibration Revision History, and apply Procedure 019-032 if calibration is necessary. The summary notes that the condition can clear after the starter cool-down period expires, up to 150 seconds, and that “Reset All Faults” can clear active and inactive faults where applicable.
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