This Cummins 689 troubleshooting document covers Fault Code 689 for the engine crankshaft speed/position circuit on Cummins CM2250 applications. It explains the circuit description, fault conditions, ECM actions, guided diagnostic checks, wiring inspections, sensor inspection, calibration verification, and fault clearing steps.
Official Cummins 689 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated listings for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other Cummins engine models shown in the procedure table |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Crankshaft Speed/Position Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 20-Jan-2011; overview section Last Modified: 11-Jun-2010 |
| Pages | 19 |
| 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 – Check the fault codes.
- Guided Step 3 – Check the crankshaft position sensor circuit.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies this fault information for Cummins ISB6.7 CM2250 and lists related CM2250 coverage for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. It also references other Cummins electronic control module procedure groups, including ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5 and ISD6.7 CM2150, ISL8.9 CM2150, ISM11 CM876, and ISZ13 CM2150, but the file information names the ISB6.7 CM2250 DTC group. See the manufacturer at Cummins official website.
Who needs this Cummins 689 troubleshooting manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this file when an Amber CHECK ENGINE light, MIL, or INSITE™ fault report shows SPN 190 FMI 2 for erratic, intermittent, or incorrect engine crankshaft speed/position data. The procedure is useful when checking the 5-VDC sensor supply, sensor return, signal circuit, connector pins, target wheel, sensor air gap, and ECM calibration before clearing the code.
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