This code 141 DTCs document is a troubleshooting manual for an engine oil rifle pressure sensor circuit voltage-below-normal fault. It explains the ECM 5 volt supply, sensor return, and signal circuit behavior, then gives guided diagnostic steps using INSITE™ electronic service tool.
Official code 141 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISC and ISL with CM2150 |
| System/Group | DTCs; Engine Oil Rifle Pressure 1 Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 141
- 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 oil pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This PDF applies to Cummins CM2150 engine diagnostics for the listed ISB6.7 CM2150 (2007-09) group, with the document text also naming ISC and ISL with CM2150. The covered fault is SPN 100, FMI 4/4, where the ECM detects engine oil pressure signal voltage below 0.25-VDC for more than 16 seconds. The component location given is the engine oil pressure sensor on the left side of the engine block. Manufacturer information is available from the Cummins official website.
Who needs this code 141 DTCs manual
Workshop technicians need this code 141 DTCs manual when an amber CHECK ENGINE light is active and the oil pressure sensor circuit must be tested before replacing parts. It is useful for checking sensor supply voltage, connector damage, harness shorts or opens, ECM connector response, and inactive fault clearing with INSITE™.
The procedure covers sensor connector inspection for loose connectors, corroded pins, bent or broken pins, pushed back pins, moisture, damaged seals, dirt, broken shells, wire insulation damage, and damaged locking tabs. It also covers voltage checks at the oil pressure +5 volt SUPPLY pin and RETURN pin, jumper-wire circuit response checks between SUPPLY and SIGNAL, checks for Fault Code 352, checks for Fault Code 135 response, and final clearing of inactive fault codes. The document notes that calibration should be verified in QuickServe® Online and that shared supply and return wiring can cause multiple active faults.
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