Cummins ISB4.5 CM2150 Fault Code: 3564 PID: SPN: 5491 FMI: 5 Aftertreatment Diesel Exhaust Fluid Line Heater Relay – Current Below Normal or Open Circuit.

Circuit Description
The aftertreatment diesel exhaust fluid line heater relay provides the power supply to line heaters 1, 2, and 3. It is controlled by the aftertreatment diesel exhaust fluid controller.

Component Location
The aftertreatment diesel exhaust fluid line heater relay location is original equipment manufacturer (OEM) dependent. Refer to the OEM service manual for more information.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswtich is ON.

Conditions for Setting the Fault Codes
The aftreatment diesel exhaust fluid controller detects that the diesel exhaust fluid line heater relay circuit is open.

Action Taken When the Fault Code is Active
-The ECM illuminates the amber CHECK ENGINE lamp and/or the MIL immediately after the diagnostic runs and fails.
-Engine torque will be reduced.

Conditions for Clearing the Fault Code
-To validate the repair, perform a key cycle. Then start the engine and let it idle for 1 minute.
-The fault code status displayed by the INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
-The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
-For OBD engines, the ECM will turn off the MIL after 3 consecutive trips where the diagnostic runs and passes.
-The “Reset All Faults” command in the INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications

Possible Causes
-Open circuit in the aftertreatment diesel exhaust fluid line heater relay circuit
-Open circuit in the aftertreatment diesel exhaust fluid controller harness
-Malfunctioning aftertreatment diesel exhaust fluid controller.