The Cummins fault code 425 troubleshooting manual is the official Cummins diagnostic procedure for the engine oil temperature sensor circuit on the ISX11.9 CM2250 engine platform. The engine oil temperature sensor is a variable-resistor sensor that measures oil temperature in the oil rifle, and the ECM supplies 5 volts and reads the returning signal voltage. This 11-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 | engine oil temperature sensor circuit, DTCs |
| Fault code reference | Fault Code 425 — SPN 612, FMI 2 |
| Warning lamp | an amber warning lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 11 |
| File size | 0.19 MB |
| Format | |
| Language | English |
Cummins fault code 425 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 425 (SPN 612, FMI 2), 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
The ECM records the fault when the oil temperature signal is erratic, intermittent or incorrect and estimates oil temperature until the fault clears. Shop Talk in the document lists the most likely causes:
- A malfunctioning engine oil temperature sensor
- Resistance in the signal line or a poor connection
Who needs the Cummins fault code 425 manual
Diesel technicians and workshop owners diagnosing Fault Code 425 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.
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