This document is a Cummins ether injection fault troubleshooting manual for Fault Code 2738. It explains the Start Enable Device 1 Circuit, the ether injection solenoid circuit, the fault conditions, and the guided checks used to confirm wiring, solenoid, ECM, and calibration status. The file is a 14-page English PDF for workshop diagnosis using Cummins INSITE™ electronic service tool.
Official Cummins ether injection fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250 references in associated procedures |
| System/Group | Ether Injection Start Circuit / DTCs |
| Publication no. | Not stated; associated bulletin numbers include 4022250 and 2883445 |
| Year/Revision | Last modified 11-Jun-2010 and 30-Dec-2010 |
| Pages | 14 |
| File size | 0.3 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 ether injection solenoid and circuit
- Guided Step 3 – Check the ECM and OEM harness
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
The extract identifies ISX11.9 CM2250 and ISX15 CM2250 ether injection start circuit coverage, with associated procedures also listing GX CM2250. The ether injection solenoid location varies by OEM, so the document directs technicians to the OEM service manual for the exact component location and OEM wiring diagram for connector pin identification. The Cummins fault listing uses PID S237, SPN 626, and FMI 3/3 for Fault Code 2738, described as voltage above normal or shorted to high source. For official manufacturer information, visit Cummins official website.
Who needs this Cummins ether injection fault manual
This Cummins ether injection fault manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE light where ether start operation is disabled. It supports checks for open circuits, shorts to voltage, connector damage, return circuit faults, ECM harness issues, ECM calibration updates, and possible ECM replacement authorization.
The troubleshooting sequence starts by reading active or inactive fault codes with INSITE™ electronic service tool. It then checks the ether injection solenoid connector for loose, corroded, bent, broken, pushed-back, expanded, wet, dirty, or damaged pins. Electrical tests include solenoid resistance, diagnostic supply voltage, return circuit resistance, signal circuit resistance, and pin-to-pin short checks in the OEM harness. The stated thresholds include less than 10k ohms for the solenoid check, greater than 5.0-VDC for the diagnostic supply voltage check, less than 10 ohms for return and signal circuit continuity, and greater than 100k ohms for pin-to-pin short testing.
Repair actions in the document include cleaning connectors, repairing or replacing damaged harnesses or connector pins, replacing the ether injection solenoid when an open solenoid is detected, repairing the OEM harness, checking calibration revision history, calibrating the ECM if required, and clearing faults after operating within the stated clearing conditions.
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