This Cummins fault 3559 document is a troubleshooting manual for the aftertreatment diesel exhaust fluid dosing unit circuit on CM2250 engines. It explains the low voltage or short-to-low-source fault, the effect on DEF injection, and the INSITE™ checks used to confirm wiring, dosing unit, controller, and calibration condition.
Official Cummins fault 3559 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated coverage also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220/ISF2.8 CM2220 AN, and ISF3.8 CM2220 AN |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Dosing Unit Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting steps Last Modified: 07-Dec-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 3559 – Aftertreatment Diesel Exhaust Fluid Dosing Unit – Voltage Below Normal or Shorted to Low 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 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 3A – Inspect the aftertreatment diesel exhaust fluid controller and harness connector pins.
- Guided Step 3B – Check the circuit response.
- Guided Step 4 – Check ECM calibration and clear fault codes.
- Guided Step 4A – Check if an ECM calibration update is available.
- Guided Step 4B – Disable the fault code.
Applicable truck models
This file applies to Cummins CM2250 aftertreatment diagnostics where Fault Code 3559, SPN 3361 FMI 4, is used for the diesel exhaust fluid dosing unit voltage below normal or shorted to low source condition. The extract identifies ISB6.7 CM2250 as the listed model for Bulletin 4022254, with associated procedure references for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, GX CM2250, ISF2.8 CM2220, and ISF3.8 CM2220 engines. Component location is OEM dependent, so the OEM service manual is still required for vehicle-specific placement. See the manufacturer at Cummins official website.
Who needs this Cummins fault 3559 manual
Workshop owners, diesel technicians, and fleet maintenance staff need this procedure when an amber CHECK ENGINE lamp or MIL appears and DEF injection is disabled. The manual supports inspections for loose connectors, corroded pins, damaged seals, controller harness shorts, a failed aftertreatment diesel exhaust fluid dosing unit, and ECM calibration updates using INSITE™ electronic service tool.
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