ISM code 143 DTCs identifies a engine Oil Rifle Pressure – Data Valid But Below Normal Operational Range – Moderately Severe Level on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 100 / FMI 1/18 (PID P100) in full. It sets out the fault description, component location, shop-talk notes, and a step-by-step troubleshooting tree so a technician can confirm and clear the code with a diagnostic tool.
ISM code 143 DTCs document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 (2007-09) |
| System / Group | DTCs / Engine Oil Rifle Pressure 1 |
| PID / SPN / FMI | P100 / SPN 100 / FMI 1/18 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
The ECM provides a 5-volt supply and a ground return to the engine oil pressure sensor. The sensor signal voltage changes based on the pressure in the oil rifle, and the ECM detects low signal voltage when oil pressure drops. This document is filed under fault code 143, engine Oil Rifle Pressure – Data Valid But Below Normal Operational Range – Moderately Severe Level. The condition raises a amber warning lamp on the dash. Because the sensor shares supply and return wires in the engine harness with other sensors, the manual advises checking for multiple active faults before starting the 143 procedure.
Document table of contents
- Fault code information: PID P100, SPN 100, FMI 1/18, lamp amber
- Description
- Component location
- Shop Talk
- Troubleshooting steps (harness, connector, and ECM checks)
- Circuit-repair verification and code clearing
Applicable truck models
This procedure applies to Cummins ISM CM871 (2007-09) engines. The identical fault code and engine oil rifle pressure 1 also appear in the parallel Cummins ISX CM871 (2007-09) listing. The troubleshooting steps inspect the engine oil rifle pressure 1 connector pins, verify the 4.75 to 5.25 VDC supply across the sensor, and confirm the fault goes inactive with a diagnostic tool after any repair. Cummins publishes the authoritative service data for these engines on its official website.
Who needs this ISM code 143 DTCs manual
Fleet technicians and workshop owners diagnosing engine oil rifle pressure 1 complaints on 2007-09 emissions-era Cummins engines need this sheet to work the fault methodically. It pairs with the wider Cummins ISM CM871 DTC set for full engine-harness coverage.
Related manuals library
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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