CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 1883

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Overview

ISX and ISM – Aftertreatment Diesel Particulate Filter Differential Pressure Sensor SMALL | MEDIUM | LARGE

Circuit Description

The electronic 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 troubleshooting manual for 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 amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value is used for the aftertreatment diesel particulate filter differential pressure reading.
• Aftertreatment regeneration will be disabled.

Conditions for Clearing the Fault Code

The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk

Verify the electronic control module (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, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

Possible causes of this fault code include:

• 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 tubes could cause this fault code if pressure is held in the tube after the engine is turned off.

Refer to Troubleshooting Fault Code t05-1883