314 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
BAP Sensor (Barometric Absolute Pressure)
Figure 383 Function diagram for the BAP sensor
The function diagra m fo r the BAP sensor includes the
following:
• BAP sensor
• Electronic Control Module (ECM)
• Injection Driver Module (IDM)
• Fuel injector
• Exhaust Gas Recirculation (EGR)
• Variable Geometry Turbocharger (VG T )
• ENGINE lamp (amber)
Function
The BAP sensor is a variable capacitance sensor
and is located in the cab. The ECM s upplies a 5
V r ef eren ce s ign a l which the BAP sensor use s to
produce a linear analog voltage signal that indicates
pressure.
The primary function of the BAP sensor is to provide
a feedback signal to the ECM to adjust timing and
fuel quantity. The ECM monitors the BAP signal to
determine altitude, adjust timing, fuel quantity, and
inlet air he ater operation.
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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