International VT 365 Service Manual page 48

44
Figure 36 Variable capacitance sensor
Variable capacitance sensors
• BAP
• EBP
• EOP
• ICP
• MAP
Variable capacitance sensors measure pressure. The
pressure measured is applied to a ceramic material.
The pressure forces the ceramic material closer to a
thin metal disk. This action changes the capacitance
of the sensor.
The sensor is connected to the ECM by three wires:
• V
REF
• Signal return
• Signal ground
The sensor receives the V
signal voltage to the ECM. The ECM compares the
voltage with pre-programmed values to determine
pressure.
The operational range of a variable capacitance
sensor is linked to the thickness of the ceramic disk.
The thicker the ceramic disk the more pressure the
sensor can measure.
Barometric Absolute Pressure (BAP)
The BAP sensor detects altitude.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
ENGINE SYSTEMS
and returns an analog
REF
EGES295-2
Follow all warnings, cautions, and notes.
© 2006 International Truck and Engine Corporation
The BAP sensor provides information to the ECM
for control of fuel quantity, fuel timing, glow plug
operation, and adjustment of the VGT to compensate
for density changes.
The BAP sensor is mounted behind the instrument
panel.
Engine Oil Pressure (EOP)
The EOP sensor detects engine oil pressure.
The EOP signal is monitored by the ECM for operation
of the instrument panel pressure gauge and optional
EWPS.
The EOP sensor is installed in the oil filter base.
Exhaust Back Pressure (EBP)
The EBP sensor measures exhaust back pressure
before the turbocharger.
The EBP sensor provides feedback to the ECM for
closed loop control of the VGT and for EGR position
calculations.
The EBP sensor is mounted on a bracket on the left
side of the engine below the ECM.
Injection Control Pressure (ICP)
The ICP sensor, a micro-strain gauge sensor,
measures injection control pressure.
The ICP signal is monitored by the ECM for closed
loop control of the IPR valve. The ICP signal is also
used by the IDM for engine fueling calculations.
The ICP sensor is installed in the right high-pressure
oil rail.
Manifold Absolute Pressure (MAP)
The MAP sensor detects intake manifold boost
pressure.
The MAP signal is monitored by the ECM for EGR
position and engine fueling calculations.
The MAP sensor is installed in the top front of the
intake manifold.