This Cummins 3561 fault code document is a diagnostic troubleshooting PDF for an aftertreatment diesel exhaust fluid dosing unit current below normal or open circuit condition. It explains the circuit, fault logic, service-tool checks, harness inspections, component decisions, calibration review, and fault clearing steps for the listed CM2250 engines.
Official Cummins 3561 fault code document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, with associated coverage also shown for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, ISF2.8 CM2220 AN, and ISF3.8 CM2220 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Dosing Unit Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 07-Dec-2010; overview section also shows 11-Jun-2010 |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- 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 2A – Inspect the aftertreatment diesel exhaust fluid dosing unit and electrical connections.
- Guided Step 2B – Check the circuit response
- Guided Step 2C – Check the fault codes and verify the aftertreatment diesel exhaust fluid dosing unit condition.
- Guided Step 3B – Check for an open circuit in the aftertreatment diesel exhaust fluid dosing unit circuit.
- Guided Step 4A – Check if an ECM calibration update is available.
Applicable truck models
The extract identifies this diagnostic for Cummins CM2250 applications, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, and GX CM2250, plus associated procedure references for ISF2.8 CM2220 and ISF3.8 CM2220. The component location is OEM dependent, so the document directs users to the OEM service manual for vehicle-specific placement of the aftertreatment diesel exhaust fluid dosing unit. See the manufacturer at Cummins official website.
Who needs this Cummins 3561 fault code manual
This Cummins 3561 fault code manual is for diesel technicians diagnosing an open circuit or current below normal condition in the DEF dosing unit circuit. It is useful when INSITE™ shows SPN 3361 FMI 5, the amber CHECK ENGINE lamp or MIL is active, and DEF injection has been disabled.
The procedure focuses on practical workshop checks: reading active and inactive fault codes, inspecting connector pins for corrosion, pushed-back terminals, moisture, damaged locking tabs, and wire insulation damage, then testing circuit response with a jumper at the dosing unit harness connector. It also covers resistance checks between the dosing unit SUPPLY, RETURN, and SIGNAL pins and the 86-pin aftertreatment diesel exhaust fluid controller connector. Decisions in the flow lead to repairing or replacing the harness, replacing the aftertreatment diesel exhaust fluid dosing unit, replacing the aftertreatment diesel exhaust fluid controller, or checking whether the ECM calibration revision is current.
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