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Aftertreatment Fuel Rate – Data Valid but Above Normal Operational Range – Moderately Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2778 PID: 289 SPN: 3481 FMI: 0/16 LAMP: Amber SRT: |
Aftertreatment Fuel Rate – Data Valid but Above Normal Operational Range – Moderately Severe Level. The lubricating engine oil needs to be changed due to possible fuel dilution. |
None on performance. |
 Aftertreatment System
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Circuit Description
The aftertreatment system requires fuel from the engine to regenerate the aftertreatment diesel particulate filter. This fuel is injected into the cylinder during a late post injection of the fuel injector. During this post injection event, it is possible that some fuel will enter the crankcase. During extended regeneration events the engine oil can become diluted with diesel fuel. This fault code is triggered when the electronic control system detects that fuel dilution of the lubricating oil is possible.
Component Location
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM). The inhibit switch may be an actual switch in the vehicle dash or it may be a J1939 message sent via the J1939 datalink. Refer to the OEM troubleshooting and repair manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes
This fault code is triggered when fuel dilution of the lubricating oil is detected by the ECM.
Action Taken When the Fault Code is Active
The ECM will set the fault code active immediately after the diagnostic is set.
Conditions for Clearing the Fault Code
The fault code is cleared by resetting the Maintenance Monitor feature. The INSITE™ electronic service tool must be used to reset the Maintenance Monitor feature.
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.
If this fault code can be triggered when fuel dilution of the lubricating oil is possible. Change the engine lubricating oil and clear the fault code using INSITE™ electronic service tool to reset the Maintenance Monitor feature.
Refer to Troubleshooting Fault Code t05-2778
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