ISM code 221 DTCs identifies a barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 108 / FMI 3/3 (PID P108) in full. It sets out the fault description, component location, shop-talk notes, and a step-by-step troubleshooting tree so a technician can confirm and clear the code with a diagnostic tool.
ISM code 221 DTCs document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 (2007-09) |
| System / Group | DTCs / Barometric Pressure Sensor Circuit |
| PID / SPN / FMI | P108 / SPN 108 / FMI 3/3 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 5 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
The ambient air (barometric) pressure sensor responds to changes in atmospheric pressure based on the elevation the engine is operating at. It has a 5-volt supply circuit, a signal circuit, and a return circuit, and shares its supply and return wires in the engine harness with other sensors. This document is filed under fault code 221, barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. The condition raises a amber warning lamp on the dash. Because the sensor shares supply and return wires in the engine harness with other sensors, the manual advises checking for multiple active faults before starting the 221 procedure.
Document table of contents
- Fault code information: PID P108, SPN 108, FMI 3/3, lamp amber
- Description
- Component location
- Shop Talk
- Troubleshooting steps (harness, connector, and ECM checks)
- Circuit-repair verification and code clearing
Applicable truck models
This procedure applies to Cummins ISM CM871 (2007-09) engines. The identical fault code and barometric pressure sensor circuit also appear in the parallel Cummins ISX CM871 (2007-09) listing. The troubleshooting steps inspect the barometric pressure sensor circuit connector pins, verify the 4.75 to 5.25 VDC supply across the sensor, and confirm the fault goes inactive with a diagnostic tool after any repair. Cummins publishes the authoritative service data for these engines on its official website.
Who needs this ISM code 221 DTCs manual
Fleet technicians and workshop owners diagnosing barometric pressure sensor circuit complaints on 2007-09 emissions-era Cummins engines need this sheet to work the fault methodically. It pairs with the wider Cummins ISM CM871 DTC set for full engine-harness coverage.
Related manuals library
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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