This document is a Cummins water fuel sensor troubleshooting guide for Fault Code 428 on CM2150-controlled ISB, ISC, and ISL engines. It explains the water-in-fuel indicator sensor circuit, the active fault conditions, and the guided diagnostic checks used to isolate sensor, connector, harness, or ECM issues.
Official Cummins water fuel sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also names ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Water-in-Fuel Sensor Circuit |
| Publication no. | Not specified in the extract |
| Year/Revision | Last Modified: 20-Jul-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 water-in-fuel sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 group and to the water-in-fuel sensor circuit used on ISB, ISC, and ISL with CM2150, as stated in the document. The component is integrated into the bottom of the OEM supplied suction fuel filter on the intake side of the engine, and the diagnostic is written around Fault Code 428, PID P097, SPN 97, FMI 3/3. The ECM sets the code when it detects sensor signal voltage above 4.95-VDC for 1 second, illuminates the amber CHECK ENGINE lamp, and leaves performance unaffected while the water-in-fuel warning is unavailable. See the manufacturer information at Cummins official website.
Who needs this Cummins water fuel sensor manual
Workshop owners, diesel mechanics, and diagnostic technicians need this manual when an ISB6.7 CM2150 truck shows active or inactive Fault Code 428. The procedure supports checks with INSITE™ electronic service tool, connector inspections, resistance tests, open-circuit checks, pin-to-pin short checks, ECM response verification, and clearing inactive fault codes after repair.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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