SPN 81 - FMI 16 (Fault Code 2754)
SPN81 FMI16
Engine Particulate Filter Inlet Pressure - Data Valid but Above Normal Operational Range - Moderately
Severe Level
 |
| ISB, ISC, and ISL - Aftertreatment |
Fault Code: 2754
PID(P), SID(S):
SPN: 81
FMI: 16
Lamp: Amber
REASON: Engine Particulate Filter Inlet Pressure - Data Valid but Above Normal Operational Range -
Moderately Severe Level. Excessive black smoke has been detected exiting the engine and entering the aftertreatment diesel particulate filter.
EFFECT: None on performance.
Circuit Description:
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter. Under normal operating conditions, the aftertreatment diesel particulate filter is self-cleaning, where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment diesel particulate filter. The soot load in the aftertreatment diesel particulate filter is estimated using the aftertreatment differential pressure sensor and the calculated soot output of the engine.
This fault code is logged when the sensors in the aftertreatment system indicates soot accumulation inside the diesel particulate filter is happening at a higher rate than under normal conditions. This indicates that the smoke (soot) being produced by the engine is higher than normal.
Component Location:
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM).
Conditions for Running the Diagnostics:
This diagnostic runs continuously when engine speed is greater than 500 rpm.
Conditions for Setting the Fault Codes:
This fault code is logged when the soot accumulation inside the diesel particulate filter is happening at a higher rate than under normal conditions.
Action Taken When the Fault Code is Active:
• The fault code is 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 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.
Possible causes of this fault code include:
• Boost leaks in the charge air cooler plumbing.
• A malfunction of the variable geometry turbocharger (VGT).
• A malfunction of the exhaust gas recirculation (EGR) valve.
• A faulty in-range EGR differential pressure sensor.
• A faulty in-range boost pressure sensor.
• A faulty in-range barometric pressure sensor.
• A cylinder misfire or overfueling.
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