Efp Sensor (Engine Fuel Pressure - Optional) - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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