This Cummins code 238 document is a troubleshooting procedure for a Sensor Supply 3 Circuit voltage below normal or shorted to low source fault. It explains how the ECM monitors the 5 volt sensor supply to the primary engine speed/position sensor and how the fault affects starting, running, warning lamps, and backup engine speed sensing.
Official Cummins code 238 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 listed Cummins engines in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Sensor Supply 3 Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 03-Jan-2011; summary section Last Modified: 11-Jun-2010 |
| Pages | 12 |
| 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 2 – Check the sensors and circuits connected to the sensor supply and return.
- Guided Step 3 – Check the ECM.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The file applies to Cummins engines using the CM2250 fault procedure shown in the document, with ISB6.7 CM2250 identified for bulletin 4022254. The associated procedure table also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and GX CM2250 coverage, plus earlier ISF, ISB, ISD, ISL, ISM, and ISZ engine families for related ECM, calibration, harness, and crankshaft position sensor procedures. For manufacturer information, see the official Cummins website.
Who needs this Cummins code 238 manual
Workshop technicians, fleet mechanics, and diesel diagnostic specialists need this manual when an amber CHECK ENGINE lamp, MIL, hard starting, or rough running is tied to Fault Code 238, PID P105, SPN 3511, FMI 4/4. It is useful when testing the engine position sensor circuit, inspecting connector pins, checking ECM response with INSITE™ electronic service tool, deciding whether to repair the engine wiring harness, replace the crankshaft position sensor, update ECM calibration, or seek authorization for ECM replacement.
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