This Cummins Code 428 document is a troubleshooting manual for the water-in-fuel indicator sensor circuit on CM2250 engines. It explains the circuit description, fault conditions, INSITE™ checks, harness tests, sensor checks, ECM response checks, calibration review, and clearing procedure for Fault Code 428.
Official Cummins Code 428 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated listings for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other engines shown in the procedure table |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Water-in-Fuel Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 17 |
| 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 2 – Check the water-in-fuel sensor and circuit.
- Guided Step 2A – Inspect the water-in-fuel sensor and connector pins.
- Guided Step 2C – Check the fault codes and verify sensor condition.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 3B – Check the ECM response.
- Guided Step 3C – Check for an open circuit in the engine harness.
- Guided Step 3C-1 – Check for an open circuit in the engine harness.
- Guided Step 3D – Check for a pin-to-pin short circuit in the engine harness.
- ECM Calibration
Applicable truck models
This file applies to Cummins engines using the water-in-fuel sensor circuit covered by Fault Code 428. The extract specifically lists ISB6.7 CM2250 and also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISM11 CM876 SN, and ISZ13 CM2150 in the associated procedures list. For manufacturer information, visit Cummins official website.
Who needs this Cummins Code 428 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when an amber CHECK ENGINE lamp is linked to high voltage on the water-in-fuel circuit. It supports checks for open RETURN or SIGNAL circuits, a SIGNAL wire shorted to sensor supply or battery voltage, connector issues, sensor resistance, engine harness faults, ECM response, and ECM calibration revision.
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