This Cummins 1938 troubleshooting document covers Fault Code 1938 for low ECU power output supply voltage detected by the VGT actuator. It explains the VGT actuator circuit, J1939 data link reporting, fault conditions, clearing conditions, and guided electrical checks. The file is a 13-page English PDF for workshop diagnostics on Cummins CM2250 engine applications.
Official Cummins 1938 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISL8.9 CM2220, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; VGT Actuator Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1938
- 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 equipment battery system.
- Guided Step 2 – Check the OEM power harness.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This PDF applies to Cummins electronic engine platforms named in the procedure table, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, ISL8.9 CM2220, QSL9 CM2250, and QSB6.7 CM2250. The fault description is for ECU Power Output Supply Voltage 1, SPN 3597, FMI 1/18, with an amber lamp and no stated performance effect. For manufacturer information, visit the Cummins official website.
Who needs this Cummins 1938 troubleshooting manual
Mechanics, fleet technicians, and workshop owners need this Cummins 1938 troubleshooting manual when a truck logs Fault Code 1938 and the VGT actuator reports battery voltage below 10-VDC. The procedure focuses on battery terminals, engine block ground, OEM power harness resistance checks, connector pin inspection, add-on accessory wiring, ECM calibration revision checks, and clearing the code with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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