Cummins ISM Code 295 is the official Cummins fault code troubleshooting PDF that documents the ambient air pressure sensor on ISM CM570 (1999-02) engines. This 2-page reference from the Cummins service literature explains the circuit, the likely causes behind the yellow warning lamp, and the step-by-step checks a technician follows to confirm the repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570, ISX CM570 and Signature CM570 (1999-02) |
| System / Group | Ambient Air Pressure Sensor (DTCs) |
| Fault code | Code 295 · PID P108 · SPN 108 · FMI 2 |
| Warning lamp | Yellow |
| Year / Revision | Copyright 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop talk – possible causes
- Troubleshooting steps
- Fault code verification and clearing
Cummins ISM Code 295 troubleshooting summary
The ambient air pressure sensor is located below the ECM. The manual walks through 4 labelled troubleshooting steps that inspect connectors and pins, measure circuit resistance, and verify the fault code is inactive after the repair.
At key-on, the readings for ambient pressure from the ambient air
pressure sensor, intake manifold pressure sensor, and oil pressure
sensor are compared. This fault code occurs if the ambient air
pressure sensor reading is different from the other two.
Applicable truck models
This procedure applies to Cummins ISM CM570, ISX CM570 and Signature CM570 engines built in the 1999-02 range, as used in Class 8 highway trucks. Always confirm the exact engine dataplate before servicing. Full engine specifications and dealer support are available on the Cummins official website.
Who needs this Cummins ISM Code 295 manual
Heavy-duty diesel technicians, fleet service managers and independent workshop owners diagnosing a Code 295 on the ambient air pressure sensor rely on this document to follow the manufacturer procedure instead of guessing at parts. Because Code 295 shares its troubleshooting logic with the ISX CM570 and Signature CM570 platforms, a single PDF supports several Cummins engine families in the same workshop.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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