This Cummins fault code document covers Fault Code 143 for engine oil pressure protection using an oil pressure switch. It identifies PID P100, SPN 100, FMI 1, explains the oil pressure switch function, and gives the checks used to confirm sensor supply voltage, actual oil pressure, and fault status.
Official Cummins fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; oil pressure – engine protection with an oil pressure switch |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 143
- PID: P100
- SPN: 100
- FMI: 1
- OIL PRESSURE – ENGINE PROTECTION WITH AN OIL PRESSURE SWITCH
- Oil Pressure Sensor Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON and verify the sensor accuracy with a mechanical gauge
- Step 2A) Connect all the components and turn key switch ON
- Step 2B) Connect all the components and turn key switch ON
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engines in the DTCs group where Fault Code 143 is used for oil pressure engine protection with an oil pressure switch. The extract notes that the oil pressure switch is located on the engine block, below and to the right of the ECM, and that some field engines can have a jumper harness kit connecting the oil pressure switch to pin K in the 23-pin OEM connector or cavity 8 in the Ford OEM connector. It also states that the ECM uses the oil pressure switch to detect the presence of lubricating oil pressure. For current manufacturer information, visit the Cummins official website.
Who needs this Cummins fault code manual
This manual is useful for mechanics, diagnostic technicians, and workshop owners checking an active or inactive Fault Code 143 on an ISB CM550 engine. It supports practical workshop steps such as confirming 4.5 to 5.25 VDC sensor supply voltage, verifying the engine speed at which the fault occurs, connecting a manual gauge, and using a diagnostic tool to clear inactive fault codes after repair.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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