Cummins ISB4.5 CM2150 Fault Code: 3562 PID: SPN: 5491 FMI: 3 Aftertreatment Diesel Exhaust Fluid Line Heater Relay – Voltage Above Normal or Shorted to High Source.

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 keyswitch is in the ON position.

Conditions for Setting the Fault Codes
The aftreatment diesel exhaust fluid controller detects that the voltage in the diesel exhaust fluid line heater relay circuit is above a calibratible value.

Action Taken When the Fault Code is Active
-The electronic control module (ECM) illuminates the amber CHECK ENGINE lamp and/or the MIL immediately when the diagnostic runs and fails.
-Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code
-To validate the repair, perform a key cycle, 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 immediately 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
-Short to battery voltage in the diesel exhaust fluid line heater relay circuit.
-Short to battery voltage in the diesel exhaust fluid controller harness.
-Malfunctioning aftertreatment diesel exhaust fluid controller.