This fault code 143 DTCs document is a two-page troubleshooting sheet for oil pressure engine protection on the ISB CM550 control system. It identifies PID P100, SPN 100, FMI 1, explains how the ECM uses the oil pressure sensor signal, and lists verification checks with a mechanical gauge and diagnostic tool. The file is intended for fault confirmation, sensor accuracy checks, and post-repair code clearing.
Official fault code 143 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Oil Pressure – Engine Protection; Oil Pressure Sensor Circuit |
| Publication no. | Not shown in the 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
- 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 document applies to Cummins ISB CM550 (1990-94) engine coverage as listed in the file information. The extract does not name a specific truck make or chassis model, so use it for vehicles equipped with the referenced Cummins ISB CM550 system and the listed oil pressure sensor circuit fault. The component location given is on the engine block, below and to the right of the ECM. For current manufacturer information, visit Cummins official website.
Who needs this fault code 143 DTCs manual
Workshop technicians need this sheet when an engine protection fault is active or stored for low oil pressure conditions. It supports comparison of diagnostic tool oil pressure data against a mechanical oil pressure gauge before clearing inactive fault codes.
The procedure directs the technician to confirm that oil pressure sensor supply voltage is between 4.5 and 5.25 VDC at the sensor, verify with the driver the engine speed at which the fault occurs, and check whether low-speed operation under load may be causing oil pressure to fall below engine protection limits. If the sensor reading is not correct and Fault Code 141 is active, the document points the technician to Fault Code 141 troubleshooting. If Fault Code 143 remains active after the listed checks, it instructs the technician to repeat the troubleshooting steps or contact a local Cummins Authorized Repair Location after all steps have been completed and checked again.
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