This 18-page PDF is the official Fault Code 3566 DTCs troubleshooting procedure covering the aftertreatment diesel exhaust fluid (DEF) dosing valve circuit when voltage is below normal or shorted to a low source. The document provides guided diagnostic steps, resistance measurements, connector inspections, and repair actions for multiple CM2250-controlled engine platforms. SPN 5394, FMI 4 triggers the amber CHECK ENGINE lamp and disables DEF injection into the aftertreatment system.
Official Fault Code 3566 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220 |
| System / Group | Aftertreatment DEF Dosing Valve Circuit — Diagnostic Trouble Codes (DTCs) |
| Publication no. | Bulletin 4022254 (ISB6.7), 4022257 (ISC8.3/ISL9), 4022250 (ISX15/GX), 2883445 (ISX11.9) |
| Year / Revision | Last modified 28-Dec-2010 |
| Pages | 18 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Conditions for Running the Diagnostics
- Fault Code 3566 Summary — SPN 5394, FMI 4, Amber Lamp
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures Table (Procedures 011-057, 011-059, 011-063, 019-032)
- Guided Step 1 — Initial Fault Code Check
- Guided Step 2 — Check DEF Dosing Valve and Circuit (connector inspection, resistance measurement)
- Guided Step 3 — Check DEF Controller and Harness (open circuit, pin-to-ground short, pin-to-pin short via 86-pin and 53-pin connectors)
- Guided Step 4A — ECM Calibration Verification
- Guided Step 4B — Disable and Clear the Fault Code
Applicable truck models
This procedure applies to vehicles equipped with the Cummins ISB6.7 CM2250 (2010–2012), ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, and ISF3.8 CM2220 engines using selective catalytic reduction (SCR) aftertreatment with a DEF dosing valve. Installation position varies by original equipment manufacturer. The INSITE™ electronic service tool is required for diagnostics, override tests, and calibration verification. For additional engine service information, visit Cummins official support.
Who needs this Fault Code 3566 DTCs manual
Diesel technicians and workshop owners diagnosing an active fault code 3566 on CM2250 or CM2220 platforms need this document. It walks through every guided step from connector pin inspection through harness resistance checks to ECM calibration verification, using specific test lead part numbers (4919546, 4919348) and threshold values (100k ohms, 10 ohms).
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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