This document is a fault code 135 DTCs troubleshooting manual for the Engine Oil Rifle Pressure 1 Sensor Circuit voltage above normal or shorted high condition. It explains the ECM 5 volt supply, sensor return, oil pressure signal circuit, fault setting logic, clearing conditions, and guided diagnostic checks used with INSITE™.
Official fault code 135 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 (2010-12) / DTCs; extract also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISL8.9 CM2150 SN, ISM11 CM876 SN, and ISZ13 CM2150 |
| System/Group | Engine Oil Rifle Pressure 1 Sensor Circuit; DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 30-Dec-2010 |
| Pages | 16 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 135
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 2 – Check the oil pressure sensor and circuit.
- Guided Step 2A – Inspect the oil pressure sensor and connector pins.
- Guided Step 2C – Check the sensor supply voltage and return circuit.
- Guided Step 2D – Check the fault codes and verify sensor condition.
- Step 3A-1 – Check the ECM response.
- Guided Step 3B – Inspect the ECM and engine harness connector pins.
- Guided Step 3B-2 – Check for an active fault code.
- Guided Step 4B – Disable the fault code.
Applicable truck models
The file applies to Cummins engine platforms listed in the procedure tables, including ISB6.7 CM2250 coverage from the library record and extracted references to ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISL8.9 CM2150 SN, ISM11 CM876 SN, and ISZ13 CM2150. It is written around an ECM-managed engine oil pressure sensor on the left side of the engine block, with checks for sensor supply voltage, return circuit integrity, signal response, harness and connector condition, ECM calibration, and possible ECM replacement authorization. See the manufacturer at Cummins official website.
Who needs this fault code 135 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this fault code 135 DTCs manual when an amber CHECK ENGINE lamp is tied to high signal voltage on the engine oil pressure circuit. The document is useful before replacing parts because it directs checks for multiple sensor supply fault codes, connector damage, open return circuits, signal shorts to sensor supply or battery voltage, ECM response, and calibration status.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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