This document is a Cummins WIF sensor circuit troubleshooting sheet for Fault Code 418 on ISB CM550 engines. It identifies the water-in-fuel sensor, describes where it is installed, and gives the diagnostic-tool checks used to confirm whether the code is inactive or cleared.
Official Cummins WIF sensor circuit document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Water In Fuel (WIF) Sensor Circuit |
| Publication no. | Not listed |
| Year/Revision | Unknown |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 418
- PID: P097
- SPN: 097
- FMI: 0
- WATER-IN-FUEL SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON, drain the water from the fuel filter and read the fault codes using the diagnostic tool.
- Step 2A) Connect all components. Turn key switch ON and disable the fault code.
- Step 2B) Connect all components, turn key switch ON and clear the inactive fault codes using the diagnostic tool.
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) coverage shown in the document group, with Fault Code 418 assigned to the water-in-fuel sensor circuit. The extract identifies the WIF sensor as attached to the fuel filter and installed in the bottom or side of the fuel filter, located on the intake side of the cylinder head approximately midengine. For manufacturer information, visit the Cummins official website.
Who needs this WIF sensor circuit manual
Workshop technicians, mobile diesel mechanics, and fleet maintenance staff use this manual when Fault Code 418 is logged and the repair path requires draining water from the fuel filter, checking inactive status, and clearing inactive fault codes with a diagnostic tool.
The procedure is short, but it is useful during routine fuel-system diagnosis because it separates a water accumulation condition from remaining active fault codes. Full PDF available in the DiagTechPro manuals library, free account required to download.
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