This Cummins DEF heater relay document is a troubleshooting manual for Fault Code 3564, covering an open circuit or current below normal condition in the aftertreatment diesel exhaust fluid line heater relay circuit. It explains the circuit description, fault effects, INSITE™ checks, relay tests, harness resistance checks, ECM calibration review, and final fault clearing steps.
Official Cummins DEF heater relay document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with related coverage shown for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, and ISF3.8 CM2220 AN |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Line Heater Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 31-Dec-2010; troubleshooting section Last Modified: 07-Dec-2010 |
| Pages | 13 |
| 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 2 – Check the aftertreatment diesel exhaust fluid line heater relay.
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 aftertreatment diagnostics where Fault Code 3564 is used for the Aftertreatment Diesel Exhaust Fluid Line Heater Relay – Current Below Normal or Open Circuit. The extract lists ISB6.7 CM2250 as the selected model group and also shows associated procedure coverage for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, and ISF3.8 CM2220 AN. The relay location is OEM dependent, so the procedure directs users to the OEM service manual for component location and relay replacement details. For manufacturer information, visit Cummins official website.
Who needs this Cummins DEF heater relay manual
Workshop technicians, fleet mechanics, and diagnostic specialists need this DEF heater relay manual when INSITE™ shows SPN 5491 FMI 5 or when diesel exhaust fluid line heaters 1, 2, and 3 are disabled. It supports structured checks for inactive and active faults, connector damage, jumper-wire circuit response, less than 10 ohm harness tests, controller diagnosis, calibration updates, and final validation.
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