CM2150 Electronic Control System – FAULT CODE 2728

Aftertreatment Fuel Injector 1 – Data Valid but Above Normal Operational Range – Moderately Severe Level


Overview

CODE REASON EFFECT
Fault Code: 2728
PID: 
SPN: 3556
FMI: 16
LAMP: None
SRT: 

Aftertreatment Fuel Injector 1 – Data Valid but Above Normal Operational Range – Moderately Severe Level. Active regeneration of the aftertreatment diesel particulate filter has been detected to be ineffective.

None on performance.

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 diagnostics runs continuously when the engine is running and an active regeneration of the aftertreatment is occurring.

Conditions for Setting the Fault Codes

The aftertreatment system has detected that an active regeneration event has occurred longer than a calibratible time and that the aftertreatment temperature have not reached a minimum temperature for a complete regeneration of the diesel particulate filter to occur.

Action Taken When the Fault Code is Active

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

Conditions for Clearing the Fault Code

The electronic control module (ECM) will disable the fault code 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.

The aftertreatment system will try to meet target temperatures at the outlet of the diesel oxidation catalyst during a regeneration event. This fault code is activated when the control system detects that excessive fuel is entering the exhaust system, in an attempt to meet the target temperatures at the diesel oxidation catalyst outlet temperature sensor.

Possible causes of this fault code include:

  • Soot plugging the front face of the aftertreatment diesel oxidation catalyst
  • Engine oil or fuel contamination of the aftertreatment diesel oxidation catalyst
  • A cracked or contaminated aftertreatment diesel oxidation catalyst
  • A leaking exhaust system between the turbocharger and the aftertreatment diesel oxidation catalyst
  • The duty cycle of the vehicle is not high enough to provide adequate exhaust temperatures for a complete regeneration event.

Refer to Troubleshooting Fault Code t05-2728

Last Modified:  20-Jul-2010