Cummins ISB4.5 CM2150 Fault Code: 3144 PID: SPN: 4360 FMI: 2 Aftertreatment SCR Intake Temperature – Data Erratic, Intermiitent, or Incorrect..

Circuit Description
The SCR intake temperature sensor is used by the electronic control module (ECM) to monitor the engine exhaust temperature entering the SCR catalyst. The ECM monitors the voltage on the signal pin and converts this to a temperature value.

Component Location
The SCR intake temperature sensor is located in the exhaust aftertreatment system. It is located between the turbocharger outlet and the intake of the SCR catalyst in the exhaust system.

Conditions for Running the Diagnostics
This diagnostic runs when the exhaust gas temperature sensors are compared to other engine temperatures during engine operation. The engine coolant temperature must be above 60°C [140°F] before the diagnostic will run.

Conditions for Setting the Fault Codes
This fault code is logged if the value of the SCR catalyst intake temperature sensor does not match the engine operating conditions.

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.
-A default value for the aftertreatment SCR intake temperature is used.

Conditions for Clearing the Fault Code
-This fault code can not be cleared with INSITE™ electronic service tool.
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE lamp and/or MIL immediately after the diagnostic runs and passes.
-Use INSITE™ electronic service tool to verify the fault code is inactive.
-The inactive fault code will be cleared from the memory after 9600 hours of engine operation without a reoccurrence.

Possible Causes
-Stuck in-range SCR intake temperature sensor
-High resistance in the SCR intake temperature sensor signal or return lines.