This Cummins crankshaft sensor code document is a 14-page troubleshooting PDF for Fault Code 2321, covering erratic, intermittent, or incorrect engine crankshaft speed/position data. It explains the ECM 5 volt supply, sensor return, crankshaft speed/position signal, fault effects, clearing conditions, and guided diagnostic checks used with INSITE™ electronic service tool.
Official Cummins crankshaft sensor code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; extract also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, GX CM2250, and earlier CM2150/CM2220 listings in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Crankshaft Speed/Position Sensor Circuit |
| Publication no. | 4022254 shown for ISB6.7 CM2250 crankshaft position sensor associated procedure; other bulletin numbers appear in the associated procedures table. |
| Year/Revision | Year unknown; Last Modified entries: 11-Jun-2010 and 28-Dec-2010 |
| Pages | 14 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 2321 – Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
- 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 2 – Check the primary speed sensor circuit (crankshaft sensor).
- Guided Step 3B – Inspect air gap and target wheel.
- Guided Step 4B – Disable the fault code.
Applicable truck models
The file applies to Cummins CM2250 engine diagnostics for Fault Code 2321, with the file classification naming ISB6.7 CM2250 and the extract also listing ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, and GX CM2250 in associated procedures. The diagnostic concerns the primary engine speed sensor, crankshaft position sensor, engine wiring harness, ECM connector checks, ECM calibration code, sensor air gap, and target wheel runout where specified in the procedure. See the manufacturer at Cummins official website.
Who needs this Cummins crankshaft sensor code manual
Workshop technicians, diesel mechanics, and fleet maintenance teams need this Cummins crankshaft sensor code manual when an engine logs SPN 190 FMI 2/2, shows intermittent misfire, reduced power, disabled regeneration, or repeated inactive counts linked to the primary speed sensor circuit. It is also useful when checking connector pins, damaged harness insulation, ECM connector issues, marginal air gap, or whether an ECM calibration update is available.
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