The Cummins fault code 429 troubleshooting manual is the official Cummins diagnostic procedure for the water-in-fuel indicator sensor circuit on the ISX11.9 CM2250 engine platform. The water-in-fuel sensor mounts on the fuel filter and receives a 5-volt reference from the ECM, which monitors the returning signal voltage. This 15-page PDF walks a technician from symptom to verified repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12) |
| System / Group | water-in-fuel indicator sensor circuit, DTCs |
| Fault code reference | Fault Code 429 — SPN 97, FMI 4 |
| Warning lamp | an amber warning lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 15 |
| File size | 0.27 MB |
| Format | |
| Language | English |
Cummins fault code 429 document contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and possible causes
- Associated Procedures table
- Guided troubleshooting steps
- Verify the repair
Applicable truck models covered
This procedure applies to Cummins engines that report Fault Code 429 (SPN 97, FMI 4), including the Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12). Always confirm the exact calibration and publication for your engine on the official Cummins engine support site before ordering parts.
Common causes and symptoms
This fault is logged when the sensor signal voltage is below normal or shorted to a low source, so a real water-in-fuel event may not be reported. Shop Talk in the document lists the most likely causes:
- Signal circuit shorted to ground in the harness, sensor or connector
- A failed water-in-fuel sensor
Who needs the Cummins fault code 429 manual
Diesel technicians and workshop owners diagnosing Fault Code 429 on ISX11.9 CM2250 trucks need this manual to follow the guided steps, use the correct connector pins and verify the repair with INSITE electronic service tool instead of guessing.
Downloading the complete procedure gives you the exact wiring diagrams, connector pin identification and INSITE service-tool checks referenced throughout the document. The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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