This Cummins fault 418 troubleshooting document explains the water-in-fuel indicator fault for CM2250 engines and the related service checks. It covers the circuit description, fault conditions, ECM lamp action, INSITE™ fault-code handling, calibration review, and repair validation steps.
Official Cummins fault 418 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage references for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other listed Cummins platforms |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Water-in-Fuel Indicator |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 6 |
| 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 418 – Water-in-Fuel Indicator – Data Valid But Above Normal Operational Range – Least Severe Level
- 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 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This file is written for Cummins CM2250 engine diagnostics and is listed under ISB6.7 CM2250, while the extract also names ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the associated procedures. The fault relates to the water-in-fuel sensor integrated into the bottom of the OEM supplied suction fuel filter, where water accumulation pulls the 5-VDC reference voltage to ground and causes the ECM to report SPN 97, FMI 0/15, with a maintenance lamp indication. For current manufacturer information, visit Cummins official website.
Who needs this Cummins fault 418 troubleshooting manual
This document is useful for mechanics, fleet technicians, and workshop owners diagnosing water detected in the fuel filter, possible loss of power, or hard starting on listed Cummins engines. It shows when to drain the fuel filter, check active or inactive counts with INSITE™ electronic service tool, compare ECM calibration revision history, and clear or disable the fault after the diagnostic passes.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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