The ISM code 135 DTCs manual is a 5-page PDF that documents fault code 135, the engine oil rifle pressure 1 sensor circuit fault set for voltage above normal or shorted to high source. It explains how the ECM supplies a 5-volt reference to the engine oil rifle pressure sensor and reads a signal that changes with pressure in the oil rifle. The procedure is credited to TruckFaultCodes.com and covers the circuit description, component location and full troubleshooting steps.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 and ISX CM871 (2007-09) engines |
| System / group | ISM CM871 (2007-09) / DTCs |
| Fault code | 135 (PID P100, SPN 100, FMI 3) |
| Warning lamp | Amber |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code 135 description
- Circuit description and ECM operation
- Component location
- Shop talk and possible causes
- Step-by-step troubleshooting flow
Applicable truck models
This diagnostic applies to Cummins ISM CM871 and ISX CM871 (2007-09) engines. The oil pressure sensor sits on the left side of the engine block and shares supply and return wires with other sensors, so one open or short can set several codes at once. Possible causes include an open return circuit in the harness, connectors or sensor, or a signal circuit shorted to the sensor supply or battery voltage. For engine data and authorised service, visit the Cummins official website.
Who needs this ISM code 135 DTCs manual
Heavy-duty diesel technicians, fleet workshops and owner-operators reach for this manual when fault code 135 is logged and the amber warning lamp is on. It gives the exact key-on checks, connector inspections and voltage measurements needed to confirm whether the sensor, the harness or the ECM is at fault before any part is replaced.
Download the ISM code 135 DTCs PDF
The complete procedure, wiring detail and step tables are available in the DiagTechPro manuals library; a free account is required to download the PDF. Keep it alongside the related ISM CM871 fault-code sheets listed below.
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