Engine Control System 1A-11
EGR Valve and EGR Valve Position Sensor
The EGR valve is installed at the top of the inlet cover
and operated by a DC motor. The DC motor operates
the EGR valve by changing the duty. The valve is
opened when the duty is increased while closed when
the duty is decreased. The ECM calculates the desired
EGR valve opening based on the vehicle running
condition and controls the DC motor accordingly.
The EGR valve position sensor is installed to the EGR
valve and sends the voltage signal that will change in
response to the EGR valve opening to the ECM. The
ECM calculates the desired EGR valve opening from
the voltage signal and uses the result in EGR control.
Intake Throttle Valve and ITP Sensor
The intake throttle valve is installed to the intake throttle
and operated by a DC motor. The DC motor operates
the intake throttle valve by changing the drive voltage.
The valve is closed when the drive voltage is increased
while opened when the voltage is decreased. The ECM
calculates the intake throttle valve opening based on
the vehicle running condition and controls the DC
motor accordingly.
The ITP (intake throttle position) sensor is installed to
the intake throttle valve and sends the voltage signal
that will change in response to the throttle valve
opening to the ECM. The ECM calculates the throttle
valve opening from the voltage signal and uses the
result in intake throttle control.
CMP Sensor
The CMP (cam position) sensor is installed to each
cylinder head and, when the hole on the camshaft gear
passes the sensor, a CMP signal is generated. The
ECM identifies the cylinder from the CMP signal as well
as CKP signal sent from the CKP sensor and
determines the crank angle, and uses this angle in fuel
injection control and engine speed calculation. These
tasks are usually performed based on the CKP signal
but if the CKP sensor fails, the CMP signal will
substitute for the CKP signal.
LNW21ASH008101
LNW21ASH008001
LNW21ASH007901
