Table of Contents
Advertisement
ELECTRONIC CONTROL SYSTEM
G G R R E E E E N N H H O O S S E E T T O O
G G R R E E E E N N H H O O S S E E T T O O
A A I I R R I I N N L L E E T T D D U U C C T T
A A I I R R I I N N L L E E T T D D U U C C T T
B B L L A A C C K K H H O O S S E E T T O O I I N N T T A A K K E E
B B L L A A C C K K H H O O S S E E T T O O I I N N T T A A K K E E
M M A A N N I I F F O O L L D D E E L L B B O O W W
M M A A N N I I F F O O L L D D E E L L B B O O W W
E E X X H H A A U U S S T T I I N N L L E E T T
E E X X H H A A U U S S T T I I N N L L E E T T
E E X X H H A A U U S S T T O O U U T T L L E E T T
E E X X H H A A U U S S T T O O U U T T L L E E T T
P P O O P P P P E E T T S S
P P O O P P P P E E T T S S
E E X X H H A A U U S S T T
E E X X H H A A U U S S T T
O O U U T T L L E E T T
O O U U T T L L E E T T
M M A A F F / / I I A A T T
M M A A F F / / I I A A T T
5 5 - - P P I I N N
5 5 - - P P I I N N
C C O O N N N N E E C C T T O O R R
C C O O N N N N E E C C T T O O R R
26
N N O O T T U U S S E E D D
N N O O T T U U S S E E D D
B B O O O O S S T T C C O O N N T T R R O O L L S S O O L L E E N N O O I I D D
B B O O O O S S T T C C O O N N T T R R O O L L S S O O L L E E N N O O I I D D
E E G G R R V V A A L L V V E E
E E G G R R V V A A L L V V E E
O O - - R R I I N N G G S S
O O - - R R I I N N G G S S
M M A A F F
M M A A F F
International
Boost Control Solenoid
• The turbocharger boost control solenoid
valve is controlled by the ECM. When
the ECM signal to the Boost Control
solenoid is high, the valve opens,
allowing pressure in the pneumatic
actuator to vent into the turbo inlet duct.
When the ECM signal is low, the valve
closes, and pressure to the actuator
equals boost pressure in the intake manifold.
Exhaust Gas Recirculation (EGR) Valve
• The EGR valve is used to control the
percent of exhaust gas in the intake
charge. The EGR valve consists of circuit
board mounted position sensors, field
coils surrounding an armature, and the
valve group. The valve group has two
poppet valves mounted to a common
stem. When the drive module provides
voltage and ground to the field coils in the
proper sequence, stepped armature
rotation occurs. A threaded rod engaged
in the center of the rotating armature
pushes or pulls against the spring
loaded valve stem to force the valve to
open or close.
Mass Air Flow (MAF) Sensor
• The Mass Air Flow (MAF) sensor is
mounted with ductwork between the
turbocharger inlet and the air filter element.
The sensor applies voltage to a low
resistance thermistor exposed to the fresh
air portion of the intake charge. The MAF
sensor circuitry measures the increase in
voltage required to offset the cooling
effect of the air flow over the thermistor.
This voltage is then converted into a
variable frequency that is sent to the ECM.
The MAF value can be read with
MasterDiagnostics
®
VT 275 V6 Engine
®
software in lb./min.
Advertisement
Table of Contents
