This Cummins ISB fault 295 document is a 12-page diagnostic procedure for Fault Code 295, covering barometric pressure data that is erratic, intermittent, or incorrect. It explains how the ECM checks the ambient air pressure sensor at initial key-on and what repair path to follow when the amber CHECK ENGINE light is triggered.
Official Cummins ISB fault 295 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references QSB3.3, ISBe, ISDe, ISC, ISL, and ISLe barometric pressure circuits |
| System/Group | DTCs; Barometric Pressure Sensor Circuit; Ambient Air Pressure Sensor |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 295
- Component Location
- Conditions for Running the Diagnostics
- 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 1 – Check for sensor circuit fault codes.
- Guided Step 2 – Check the barometric pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
The file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group. The procedure also names related Cummins applications and circuits, including QSB3.3, ISBe, ISDe, ISC, ISL, and ISLe, but the listed document group is ISB6.7 CM2150 DTCs. For official manufacturer information, visit Cummins official website.
Who needs this Cummins ISB fault 295 manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Cummins ISB fault 295 manual when an engine reports PID P108, SPN 108, FMI 2/2 with an amber lamp and possible engine power derate. It supports checks with INSITE™ electronic service tool, connector inspection, circuit response testing, ECM connector inspection, harness repair decisions, and fault clearing after verification.
The procedure describes the ambient air pressure sensor circuit, including the 5 volt supply circuit, sensor signal voltage, and return circuit. It states that the ECM compares barometric pressure with intake manifold pressure, exhaust gas pressure if equipped, and engine oil pressure if equipped at key-on before starting. It also notes possible causes such as a stuck in-range barometric pressure sensor reading, high resistance in the signal or return lines, and incorrect sensor installation on ISB applications where similar-looking sensors may be interchanged.
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