406 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
EFP Sensor (Engine Fuel Pressure – optional)
Figure 437 Function diagram for the EFP sen
sor
The function diagram for the EFP sensor
includes the
following:
• EFP sensor
• Electronic Control Module (ECM)
• ENGINE lamp (amber)
• FUELFILTERlamp(amber)
Function
The EFP sensor is a variable capacitance
sensor
installed in the rear of the fuel filt
er assembly
(crankcase side). The EC M supplie
s a 5 V reference
signal which the EFP sensor uses to
produce a linear
analog voltage that indicates pr
essure. The ECM
uses the EFP sensor signal to mon
itor engine fuel
pressure and give an indicatio
nwhenthefuelfilter
needs to be changed.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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