This Cummins fault 221 document is a troubleshooting PDF for Fault Code 221 on Cummins CM2250 engines. It covers barometric pressure sensor circuit voltage above normal or shorted to high source conditions, including sensor, harness, ECM, calibration, and INSITE™ checks.
Official Cummins fault 221 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; ISC8.3 and ISL9 CM2250; ISX11.9 CM2250; QSL9 CM2250; QSB6.7 CM2250; ISX15 CM2250; GX CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; barometric pressure sensor circuit; turbocharger compressor intake pressure sensor circuit |
| Publication no. | Not stated for the PDF; associated bulletin numbers include 4022254, 4022257, 2883445, 4022256, 4022255, and 4022250 |
| Year/Revision | Last modified dates shown: 27-Oct-2009, 11-Jun-2010, 20-Jul-2010, and 04-Jan-2011 |
| Pages | 33 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE 145-fc221 Fault Code Path Selection
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 221 (ISB, ISC, ISL) – Barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
- 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 the fault codes
- Guided Step 2 – Check the turbocharger compressor intake pressure sensor and circuit
- Guided Step 3 – Check the ECM and engine harness
- Guided Step 4B – Disable the fault code
Applicable truck models
The file applies to Cummins engines listed in the extract, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, ISX15 CM2250, and GX CM2250. For ISB, ISC, and ISL coverage, the document identifies the combination turbocharger compressor intake pressure/temperature sensor in the OEM intake air plumbing; for ISX-related coverage, later pages refer to the barometric pressure sensor and circuit. Manufacturer information is available at Cummins official website.
Who needs this Cummins fault 221 manual
This Cummins fault 221 manual is intended for mechanics, diesel diagnostic technicians, and workshop owners tracing an active or inactive Fault Code 221 with INSITE™ electronic service tool. It is useful when checking Fault Code 227 first, inspecting connector pins, testing sensor response, reviewing ECM connector condition, and confirming ECM calibration revision status.
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