Table of Contents
Advertisement
314
7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
BAP Sensor (Barometric Absolute Pressure)
Figure 383 Function diagram for the BAP sensor
The function diagram for 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 (VGT)
•
ENGINE lamp (amber)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Function
The BAP sensor is a variable capacitance sensor
and is located in the cab. The ECM supplies a 5
V reference signal which the BAP sensor uses 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 heater operation.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Advertisement
Chapters
Table of Contents
