This Cummins WIF sensor document is a 4-page fault code troubleshooting file for Fault Code 429 on Cummins ISB CM550 engines. It identifies the water-in-fuel sensor circuit, explains the ECM signal and return wiring, and lists the diagnostic checks used to confirm the repair.
Official Cummins WIF sensor 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; document copywrite 2017 |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 429
- PID: P097
- SPN: 097
- FMI: 4
- WATER-IN-FUEL (WIF) SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Turn key switch ON, connect all components and read the fault codes using the diagnostic tool
- Step 2A: Inspect the OEM harness, WIF sensor, and ECM connectors
- Step 2B: Check for a short circuit to ground
- Step 2C: Check for a short circuit from pin to pin
- Step 2D: Check sensor supply voltage
- Step 3A: Verify that Fault Code 429 is inactive
- Step 3B: Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engine coverage as listed in the document library data. The extract describes the WIF sensor installed in the fuel filter, located on the side of the head approximately midway on the engine. It covers Fault Code 429 with PID P097, SPN 097, and FMI 4. The procedure is for the water-in-fuel sensor circuit, including the two-wire circuit with return ground at pin 20 and signal wire at pin 40. The steps also reference the OEM harness, ECM connector, WIF sensor connector, engine block ground, pin B, and sensor supply voltage of (+)4.75 to 5.25 VDC. For manufacturer information, visit Cummins official site.
Who needs this Cummins WIF sensor manual
Workshop technicians need this Cummins WIF sensor manual when diagnosing an active or inactive Fault Code 429 on the listed ISB CM550 coverage. It is also useful for shop owners checking whether the repair requires connector inspection, OEM harness replacement, WIF sensor replacement, ECM replacement, or follow-up troubleshooting for remaining active fault codes.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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