This fault code 1923 DTCs troubleshooting guide covers the aftertreatment fuel shutoff valve circuit and the diagnostic steps used when voltage is above normal or shorted to a high source. It is an 11-page PDF for Cummins CM2250 applications, using INSITE™ service-tool checks, connector inspections, resistance tests, harness tests, ECM calibration review, and fault-code clearing steps.
Official fault code 1923 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250 as listed in the associated procedures |
| System/Group | Aftertreatment Fuel Shutoff Valve 1 Circuit / DTCs |
| Publication no. | 4022250 and 2883445 are referenced for associated procedures |
| Year/Revision | Last Modified: 11-Jun-2010 and 19-Jan-2011 |
| Pages | 11 |
| 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
- FAULT CODE 1923 – Aftertreatment Fuel Shutoff Valve 1 Circuit – Voltage Above Normal or Shorted to High Source
- 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 aftertreatment fuel shutoff valve and circuit
- Guided Step 3 – Check the ECM and engine harness
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
The procedure applies to Cummins CM2250 engines listed in the extract: ISX11.9 CM2250, ISX15 CM2250, and GX CM2250. The fault code is for SPN 3482, FMI 3/3, where high signal voltage is detected at the aftertreatment fuel shutoff valve circuit; when active, the amber CHECK ENGINE lamp or MIL can illuminate, active diesel particulate filter regeneration is disabled until the next key cycle, and engine torque can be reduced after extended operation. See Cummins service and product information at Cummins official website.
Who needs this fault code 1923 DTCs manual
This code 1923 DTCs manual is useful for diesel technicians, fleet maintenance teams, and workshop owners diagnosing aftertreatment fuel shutoff valve wiring, connector, valve-resistance, ECM connector, and calibration issues. It gives decision points such as 4 to 6 ohms at the valve and greater than 100k ohms for short-circuit checks.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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