This fault code 221 DTCs document is a troubleshooting PDF for the barometric pressure sensor circuit on Cummins ISB6.7 CM2150 engines. It explains the voltage-above-normal condition, diagnostic conditions, ECM actions, inspection points, circuit checks, and fault-code clearing steps. The file is intended for service technicians using INSITE™ electronic service tool and Cummins troubleshooting procedures.
Official fault code 221 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Barometric Pressure Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 221
- 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 the 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
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group. The extract also references ISB – Barometric Pressure Sensor Circuit and ISC and ISL – Barometric Pressure Sensor Circuit, but the file information identifies the covered group as ISB6.7 CM2150. For manufacturer information, visit Cummins official website.
Who needs this fault code 221 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 221 DTCs manual when an amber CHECK ENGINE light appears with SPN 108 FMI 3/3 or when INSITE™ reports high signal voltage at the barometric pressure circuit. The procedure supports connector inspection, 5 volt supply and return voltage checks, ECM connector testing, and engine harness repair decisions.
The troubleshooting path starts by checking for sensor supply fault codes, including Fault Code 386, then verifying whether Fault Code 221 is active or inactive. It directs the technician to inspect the barometric pressure sensor connector for loose, corroded, bent, broken, pushed-back, expanded, wet, dirty, or damaged pins and seals. It also checks whether Fault Code 222 becomes active and Fault Code 221 becomes inactive after the sensor is disconnected.
The electrical checks shown in the extract use a 4.75 to 5.25 VDC specification between the barometric pressure +5 volt SUPPLY pin and the barometric pressure RETURN pin. If the voltage or circuit response is not correct, the steps move to ECM and engine harness connector inspection, ECM response checks, possible signal-line short diagnosis, engine wiring harness repair or replacement, or authorization to replace the ECM under the referenced Cummins procedure.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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