This Cummins DEF pressure document is a fault-code service reference for Cummins aftertreatment diesel exhaust fluid pressure sensor Fault Code 3575. It identifies air-assisted and airless SCR dosing system paths, the code reason, diagnostic conditions, clearing requirements, and shop notes for blocked DEF return flow.
Official Cummins DEF pressure document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB4.5, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISZ13 CM2150, ISM11 CM876 SN, ISF2.8 CM2220 AN, and ISF3.8 CM2220 AN. |
| System/Group | DTCs; aftertreatment diesel exhaust fluid pressure sensor circuit; selective catalytic reduction dosing system. |
| Publication no. | 08-fc3575 |
| Year/Revision | Last modified 03-Feb-2011, 17-Jan-2011, and 07-Jan-2011 in the sampled sections; model group year listed as unknown. |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code Path Selection
- Is the selective catalytic reduction (SCR) dosing system air-assisted?
- Is the selective catalytic reduction (SCR) dosing system airless?
- Overview
- Circuit Description
- FAULT CODE 3575 (Air-assisted)
- 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
- Refer to Troubleshooting Fault Code 3575 (Air-assisted)
- FAULT CODE 3575 (Airless)
- Refer to Troubleshooting Fault Code 3575 (Airless)
Applicable truck models
This file applies to Cummins engines and aftertreatment configurations named in the extract, including ISB6.7 CM2150 (2007-09) and listed related platforms using the aftertreatment diesel exhaust fluid pressure sensor circuit. The air-assisted section references ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISZ13 CM2150, and ISM11 CM876 SN, while the airless section references ISF2.8 CM2220 AN and ISF3.8 CM2220 AN. For manufacturer information, visit Cummins official website.
Who needs this Cummins DEF pressure manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins DEF pressure manual when diagnosing SPN 4334 FMI 16, amber CHECK ENGINE or MIL warnings, SCR priming faults, and suspected restriction in the diesel exhaust fluid return line. The document is useful when INSITE™ shows Fault Code 3575 and the repair must be validated by allowing the diagnostic to run and verifying that the code becomes inactive.
The extract states that pressure is detected when no pressure is expected, or that the dosing unit detects blocked diesel exhaust fluid return flow. It also notes that the fault cannot be cleared directly with INSITE™ electronic service tool, that engine idle validation is required, and that inactive fault memory clears after 9600 hours without recurrence. Full PDF available in the DiagTechPro manuals library, free account required to download.
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