This Cummins code 1927 troubleshooting document is a diagnostic manual for Fault Code 1927, covering an aftertreatment fuel pressure sensor circuit with voltage above normal or shorted to a high source. It explains circuit operation, fault logic, INSITE™ checks, connector inspections, sensor tests, harness checks, ECM calibration review, and clearing steps.
Official Cummins code 1927 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250; file listing also references ISB6.7 CM2250 (2010-12) |
| System/Group | Aftertreatment Fuel Pressure Sensor Circuit / DTCs |
| Publication no. | 4022250 and 2883445 are referenced in associated procedures |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 19-Jan-2011 |
| Pages | 15 |
| 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 1 fuel pressure sensor 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 coverage for ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 engines in the associated procedure table, with the file information listing ISB6.7 CM2250 (2010-12) under DTCs. The fault applies to the aftertreatment fuel pressure sensor located in the aftertreatment shutoff valve assembly, where the ECM supplies a 5 volt reference and monitors signal voltage to calculate aftertreatment fuel pressure. The procedure states that Fault Code 1927 sets when signal voltage is more than 4.8-VDC for more than 1 second. See the manufacturer at Cummins official website.
Who needs this Cummins code 1927 troubleshooting manual
This manual is for diesel technicians, fleet maintenance staff, and workshop owners diagnosing SPN 3480 FMI 3/3, amber CHECK ENGINE lamp events, disabled active diesel particulate filter regeneration, or torque reduction linked to this aftertreatment pressure circuit. It is useful when checking Fault Code 386, Fault Code 1928, sensor supply voltage, return circuit condition, connector pin damage, pin-to-pin shorts, ECM connector issues, and ECM calibration status with INSITE™ electronic service tool.
The diagnostic flow lists practical repair directions, including cleaning connector pins, repairing damaged harnesses or connectors, replacing the aftertreatment 1 fuel pressure sensor when indicated, seeking authorization before ECM replacement, and using ECM calibration Procedure 019-032 when a related update is available. Full PDF available in the DiagTechPro manuals library, free account required to download.
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