KC-2055

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Mack Check Fuel Filter – Instrument Cluster
Warning Message And Icon - US20 Emissions
Related links and
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Beginning with US17+OBD20 and US21+OBD20 emissions (emissions level
depends on the engine
attachments
installed), vehicles built with Mack engines have been equipped with a dedicated supply fuel pressure
No links or
sensor. The pressure sensor is used to continually monitor the fuel supply pressure and provide early
attachments available
warning detection of low fuel supply pressure or filter restriction. The engine control module (EMS)
monitors the pressure sensor values and activates a warning message or icon in the instrument cluster
(IC), depending on the model of the vehicle, when the supply pressure values are below the calibrated
limit. It is necessary to have the correct software for the EMS and IC to enable this early warning
detection.
IMPORTANT
Any potential root cause for a decrease in supply fuel
pressure will activate the warning message.
The warning message and icon do not automatically indicate
fuel filter(s) are the only component that needs to be
investigated for the decrease in supply fuel pressure.
Example of message and icon:
Applicable Vehicles with a main software (MSW) Part Number listed below or newer for the EMS
and IC will have the early warning fuel filter restriction message enabled.
Model
AN, GR, PI
LR
TE
Engine
11L VGT
13L VGT
13L TC
IC MSW Part #
23752219
23745220
23814202
EMS MSW Part #
23783118
23783118
23783119
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Description of functionality: How and when warning message
or icon will appear.
Once per drive cycle
If low supply fuel pressure is detected, the warning will appear in the instrument cluster display or the
telltale panel. It will remain in the “Pop-up Notices” screen in the instrument cluster display for the
remainder of that drive cycle.
Goes away after key off
On the next drive cycle, the warning will no longer be displayed (unless the low supply fuel pressure is
detected again).
Warning message or icon history can be viewed in Tech Tool
Tech Tool Operation ID 2300-08-03-02 Fuel Pressure. See the section below for more detailed
information.
P008A Low Pressure Fuel System Pressure - Too Low:
The functionality remains unchanged for model year 2021 and still has an associated MIL lamp.
Diagnosing Vehicles with Warning Message Or Icon
Warning history can be viewed in Tech Tool
Tech Tool Operation ID 2300-08-03-02 Fuel Pressure, in Tech Tool SW version 2.7.115 and later,
enables new functionality related to the warning message or icon. Warning history, as well as live
supply fuel pressure data, are available in this operation. See section below for more detailed
information.
Warning message or icon has no corresponding DTC
The fuel filter warning is not triggered by a DTC. Instead, parameters are transmitted by the EMS for
the instrument cluster to display the warning message or icon. Below are new parameters related to
supply fuel pressure that can be viewed in Tech Tool Operation ID 2300-08-03-02 Fuel Pressure.
Parameter
P1WER
P1WES
P1WEM
P1WEG
P1F24
Description
Fuel System, Fuel Filter Clogging Symptom Detected, Status
Fuel System, Latest Clogged Fuel Filter Symptom Detected, Timestamp
Number of warning events since last EMS SW update
The first time since last EMS SW update that the warning was set
Supply Fuel Pressure (gauge)
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Parameters/Warning Status cannot be cleared like a DTC
The warning status parameters listed above (P1WER, P1WES, P1WEM, P1WEG) cannot be
erased/reset with a DTC clear. The only way to reset them is with an EMS SW update. However,
P1WER can be “healed” (see below).
Warning Message or Icon Status (P1WER) takes 5 drive cycles to “heal”
The warning status parameter P1WER, can “heal” and reset its status back to inactive. This will occur if
5 drive cycles are completed with no warning or low pressure symptoms being detected.
Warning Message relationship with P008A, P20DC, P0087, P228F, P016F, P1036
The fuel filter warning diagnostic is designed to be an early warning so the driver can bring the vehicle
in for filter replacement before more severe fuel system low pressure or high fuel pressure DTCs occur.
However, it is possible for a vehicle to have an active fuel filter warning status and other fuel system
DTCs active.
Further information
Fuel lter housing components
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PTT screen for Operation 2300-08-03-02 Fuel Pressure
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a
Tags
FUEL FILTER WARNING
FUEL FILTER MESSAGE
FUEL FILTER ICON
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