This Cummins fault 425 document is a troubleshooting manual for an engine oil temperature fault described as data erratic, intermittent, or incorrect. It explains the engine oil temperature sensor circuit, fault setting logic, INSITE™ checks, wiring inspections, ECM response tests, calibration review, and final fault clearing steps.
Official Cummins fault 425 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250, ISZ13 CM2150 references; file group lists ISB6.7 CM2250 (2010-12) |
| System/Group | DTCs / Engine Oil Temperature Sensor Circuit |
| Publication no. | Associated bulletins shown: 4022133, 4022250, 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 04-Jan-2011 |
| Pages | 11 |
| File size | 0.2 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 1 – Check for sensor circuit fault codes.
- Guided Step 2 – Check the oil temperature sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies ISX11.9 CM2250 and ISX15 CM2250 in the engine oil temperature sensor circuit heading, and the associated procedures table also lists GX CM2250 and ISZ13 CM2150 references. The file information supplied for the library group lists ISB6.7 CM2250 (2010-12) / DTCs, so workshop users should confirm the engine model and ECM family before applying the procedure. See the manufacturer at Cummins official website.
Who needs this Cummins fault 425 manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE lamp or MIL linked to Engine Oil Temperature – Data Erratic, Intermittent, or Incorrect. It is useful when checking Fault Codes 212 and 213, inspecting sensor and ECM connector pins, testing circuit response with INSITE™ electronic service tool, or deciding whether the fault points to the oil temperature sensor, engine harness, ECM calibration, or ECM replacement authorization.
The PDF also describes cold-soak validation: the engine must be shut down with the keyswitch off for 10 hours, then started and idled for up to 5 minutes so the diagnostic can run and pass. Full PDF available in the DiagTechPro manuals library, free account required to download.
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