This Fault Code 141 DTCs document is a diagnostic PDF for the Oil Pressure Sensor Circuit on ISB CM550 engines. It identifies PID P100, SPN 100, FMI 4, explains how the ECM monitors lubricating oil pressure, and gives step-by-step electrical checks for the sensor, harness, and ECM. The file is intended for fault-code diagnosis, not general engine service.
Official Fault Code 141 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Oil Pressure Sensor Circuit |
| Publication no. | Not stated in extract |
| Year/Revision | Unknown; document copywrite 2017 shown in extract |
| Pages | 5 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 141
- PID: P100
- SPN: 100
- FMI: 4
- FAULT CODE PATH SELECTION
- Oil Pressure Sensor Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON and read the fault codes using the diagnostic tool.
- Step 2A) Inspect the oil pressure sensor and the engine harness connector pins.
- Step 2B) Check the oil pressure sensor supply voltage.
- Step 2C) Check the oil pressure sensor signal voltage.
- Step 3A) Inspect the engine harness and the ECM connector pins.
- Step 3B) Check for an open circuit.
- Step 3C) Check for a short circuit to ground.
- Step 3D) Check for a short circuit from pin to pin.
- Step 4A) Disable the fault code and verify that Fault Code 141 is inactive.
- Step 4B) Clear the inactive fault codes using the diagnostic tool.
Applicable truck models
This PDF applies to Cummins ISB CM550 (1990-94) diagnostic trouble code work where the engine control module reports Fault Code 141 for the Oil Pressure Sensor Circuit. The extract states that the oil pressure sensor is located on the engine block, below and to the right of the ECM, and that the ECM uses the oil pressure value for the engine protection system. It also notes that if Fault Code 143 or 415 is not present, the problem is not related to the engine lubrication system. For manufacturer information, visit the Cummins official website.
Who needs this Fault Code 141 DTCs manual
Workshop owners, fleet technicians, and diesel mechanics need this Fault Code 141 DTCs manual when diagnosing low signal voltage or circuit faults in the oil pressure sensor wiring. It supports connector inspection, breakout cable voltage checks using Part Number 3824775, resistance tests at ECM pins 33, 10, and 19, and final code clearing with a diagnostic tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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