Cummins ISB4.5 CM2150 Fault Code: 1883 PID: SID 324 SPN: 3251 FMI: 2 Aftertreatment Diesel Particulate Filter Differential Pressure Sensor – Data Erratic, Intermittent, or Incorrect.

Circuit Description
The engine control module (ECM) provides a 5 volt supply to the aftertreatment diesel particulate filter differential pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The aftertreatment diesel particulate filter differential pressure sensor provides a signal to the ECM on the aftertreatment diesel particulate filter differential pressure sensor signal circuit. This sensor signal voltage changes, based on the differential pressure across the aftertreatment diesel particulate filter.

Component Location
The aftertreatment diesel particulate filter differential pressure sensor is located in the aftertreatment system. Refer to the OEM service manual for the exact location of the aftertreatment system.

Conditions for Running the Diagnostics
-This diagnostic runs when the keyswitch is initially turned ON.
-The diagnostic only runs once per trip.

Conditions for Setting the Fault Codes
The diagnostic runs immediately after a startup delay has elapsed. The fault code is logged at key ON if the absolute value of the differential pressure is higher than a threshold.

Action Taken When the Fault Code is Active
-The ECM illuminates the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
-A default value is used for the aftertreatment diesel particulate filter differential pressure reading.

Conditions for Clearing the Fault Code
To validate the repair, perform a key cycle and leave the key in the ON position for 1 minute. Start the engine and operate to high idle for 1 minute. It is necessary to elevate the exhaust flow for at least 30 seconds to clear this fault code. For certain applications, it may be necessary to drive the vehicle in order to achieve adequate exhaust flow for clearing the fault code.

Shop Talk
Verify the ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM.

Possible Causes
-Stuck in-range aftertreatment diesel particulate filter differential pressure sensor reading
-High resistance in the aftertreatment diesel particulate filter differential pressure sensor signal or return wires
-Plugged aftertreatment differential pressure sensor ports could cause this fault code if pressure is held in the port after the engine is turned off.