This code 1924 DTCs document is a troubleshooting procedure for Aftertreatment Fuel Shutoff Valve 1 Circuit voltage below normal or shorted to low source. It explains the circuit description, fault conditions, engine response, diagnostic steps, resistance checks, ECM harness inspections, calibration review, and clearing procedure for the fault.
Official code 1924 DTCs document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250 as shown in the associated procedures table |
| System/Group | Aftertreatment Fuel Shutoff Valve 1 Circuit; DTCs |
| Publication no. | 4022250 and 2883445 are listed for associated procedures |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 19-Jan-2011 |
| Pages | 14 |
| 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 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 extract identifies this procedure for Cummins ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 engines in the associated procedures table. The document title line also references ISX11.9 CM2250/ISX15 CM2250 for the Aftertreatment Fuel Shutoff Valve 1 Circuit. For factory product and support information, visit Cummins official website.
Who needs this code 1924 DTCs manual
Workshop diagnosticians, diesel mechanics, and fleet maintenance teams use this code 1924 DTCs manual when an amber CHECK ENGINE lamp or MIL appears and active aftertreatment diesel particulate filter regeneration is disabled. It is also useful when checking an aftertreatment fuel shutoff valve, connector pins, the engine harness, ECM connector circuits, or ECM calibration with INSITE™ electronic service tool.
The procedure states that the aftertreatment fuel shutoff valve disables fuel supply to the aftertreatment system, and the sensor is located in the aftertreatment shutoff valve assembly. Fault Code 1924 is set when the engine fuel shutoff valve circuit PWM signal is detected at 0-VDC when the PWM voltage is turned off. The diagnostic path includes checking for inactive codes, inspecting dirty or damaged connector pins, measuring valve resistance between SUPPLY and RETURN pins, checking for shorts to ground, checking harness open circuits, checking pin-to-pin shorts, and confirming whether an ECM calibration update applies. The specified resistance checks shown in the extract include 4.0 to 6.0 ohms for the valve and greater than 100k ohms for several open-circuit or short-circuit checks.
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