This code 415 DTCs document is a two-page troubleshooting sheet for an engine oil pressure switch fault on ISB CM550 coverage. It identifies PID P100, SPN 100, FMI 1, and explains how the ECM uses the switch to detect lubricating oil pressure for engine protection. The file is intended for quick diagnostic use with a mechanical gauge and a vehicle data-link diagnostic tool.
Official code 415 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; oil pressure – engine protection with an oil pressure switch; oil pressure sensor circuit |
| Publication no. | Not stated in extract |
| Year/Revision | Unknown; document copywrite 2017 as shown in extract |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 415
- 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 components, disable the fault code, start the engine, and verify Fault Code 415 is inactive
- Step 2B) Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This document applies to Cummins ISB CM550 engines listed under 1990-94 coverage in the DTC group. The extract also notes field-installed jumper harness routing that can connect the oil pressure switch to pin K in the 23-pin OEM connector or cavity 8 in the Ford OEM connector, but it does not list specific truck model names. The component location is given as the engine block below the ECM. For manufacturer information, visit the Cummins official website.
Who needs this code 415 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this manual when a Cummins ISB CM550 logs Fault Code 415 and the repair path requires confirmation of actual oil pressure before replacing or tracing electrical parts. It is also useful when checking whether low idle speed, low lubricating oil pressure, switch response, or remaining active fault codes are driving an engine protection complaint.
The troubleshooting sequence directs the technician to verify oil pressure with a mechanical gauge, compare switch status through the diagnostic tool, and confirm the reported switch value when oil pressure is above 41 kPa [6 psi]. It also states that the fault triggers if lubricating oil pressure drops below 41 kPa [6 psi] for 30 seconds, with Engine Protection Shutdown activated after an additional 30 seconds if enabled in the ECM. The final steps cover disabling the fault code, idling the engine for one minute, confirming the code is inactive, and clearing inactive codes after the repair. Full PDF available in the DiagTechPro manuals library, free account required to download.
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