CM2150 Electronic Control System – FAULT CODE 2743

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Overview

ISB, ISC, and ISL – Aftertreatment System SMALL | MEDIUM | LARGE

Circuit Description

The aftertreatment system is monitored by three temperature sensors that are located in the exhaust system. The aftertreatment diesel oxidation catalyst inlet temperature sensor is located after the turbocharger outlet at the inlet of the aftertreatment system. The aftertreatment diesel particulate filter inlet temperature sensor is located between the aftertreatment diesel oxidation catalyst and the aftertreatment diesel particulate filter. The aftertreatment diesel particulate filter outlet temperature sensor is located after the aftertreatment diesel particulate filter. The temperature sensors around the aftertreatment diesel oxidation catalyst are used to monitor the temperature differential across the catalyst during active regeneration of the aftertreatment system.

Component Location

The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst can vary depending on the original equipment manufacturer (OEM).

Conditions for Running the Diagnostics

• The diagnostic runs during a stationary regeneration of the aftertreatment diesel particulate filter.
• The diagnostic also runs during extended idle periods when the exhaust temperature can not be increased in the aftertreatment system to remove water accumulation.

Conditions for Setting the Fault Codes

• The ECM detects that the temperature measured at the diesel oxidation catalyst inlet is not meeting the target temperatures required for stationary regeneration.
• The ECM detects that the temperature entering the aftertreatment system is not high enough to remove water from the system during extended idle periods.

Action Taken When the Fault Code is Active

• The set the fault code active immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code

• Use INSITE™ electronic service tool to perform the aftertreatment diesel particulate filter regeneration test found under ECM Diagnostics Test.
• The ECM will disable the fault code immediately after the diagnostic runs and passes or after a keyswitch cycle.

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.

The aftertreatment system will try to meet target temperatures at the inlet of the diesel oxidation catalyst prior to beginning a stationary regeneration event. This fault code is activated if the engine is not able to meet the commanded minimum exhaust temperature required at the inlet of the aftertreatment system. This is prior to any aftertreatment fuel injection into the exhaust system.

Possible caused of this fault code include:

• A leaking exhaust system between the turbocharger and the aftertreatment diesel oxidation catalyst
• Excessive exhaust temperature loss between the turbocharger outlet and the inlet of the aftertreatment system.

Refer to Troubleshooting Fault Code t05-2743