This oil temperature sensor DTCs document is a troubleshooting manual for Fault Code 212, Engine Oil Temperature Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. It explains the sensor circuit, diagnostic conditions, ECM response, connector checks, resistance checks, harness tests, calibration review, and fault clearing steps for the sampled Cummins CM2250 material.
Official oil temperature sensor DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250, ISM11 CM876 SN, ISZ13 CM2150; file listing: ISB6.7 CM2250 (2010-12) |
| System/Group | DTCs; Engine Oil Temperature Sensor 1 Circuit |
| Publication no. | Not shown; associated bulletin numbers include 4022196, 4022133, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 03-Jan-2011 |
| Pages | 15 |
| 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 the fault codes.
- Guided Step 2 – Check the engine oil temperature sensor
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extracted procedure applies to Cummins electronic engine platforms named in the document, including ISX11.9 CM2250 and ISX15 CM2250 in the fault heading, plus associated procedure coverage for GX CM2250, ISM11 CM876 SN, and ISZ13 CM2150. The file listing also identifies ISB6.7 CM2250 (2010-12) / DTCs, but the sampled diagnostic pages repeatedly reference Fault Code 212 for Engine Oil Temperature Sensor 1 Circuit and related Cummins ECM, harness, sensor, and calibration procedures. For manufacturer information, visit Cummins official website.
Who needs this oil temperature sensor DTCs manual
This manual is for technicians diagnosing an active or inactive Fault Code 212 with INSITE™ electronic service tool, especially when the ECM reports high signal voltage or an open circuit in the engine oil temperature circuit. It is also useful for workshop owners checking whether a job involves sensor replacement, connector repair, engine harness repair, ECM calibration, or possible ECM authorization.
The diagnostic sequence starts with fault code status, then moves to sensor connector inspection, sensor resistance measurement between 180 ohms to 160k ohms, and verification after reconnecting the sensor. Later steps inspect ECM and engine harness connector pins, check whether Fault Code 213 becomes active while Fault Code 212 becomes inactive, measure return and signal circuit resistance, and test for pin-to-pin shorts above 100k ohms. The oil temperature sensor DTCs procedure also notes that an open shared return wire can cause multiple active fault codes. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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