2008 MITSUBISHI LANCER EVOLUTION X sensor

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-15
This allows ECM precise feedback control to get theoretical
air-fuel ratio with best cleaning efficiency of 3-way catalytic con
-
verter.
.
CRANKSHAFT POSITION SENSOR
A crankshaft position sensor is installed on the right side of the
cylinder block. The crankshaft position sensor monitors rotation
of crankshaft sensing ring (36 teeth including 3 missing teeth)
installed on the crankshaft and converts to voltage (pulse sig
-
nal) that is output to ECM. ECM uses crankshaft position sen-
sor's output pulse to detect crankshaft position.
.
AK602263AC
100
0HC
CONOx 50 Purge ratio
Theoretical air fuel ratio
AK602576AC
From MFI relay
Heated xygen sensor
Heater
Zirconia elementECM
0.5V
AK602737AC
Crankshaft
position
sensor Crankshaft sensing ring
(36 teeth including 3 missing teeth)

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-16
The crankshaft position sensor uses a magnetic resistance ele-
ment. When the vane of the crankshaft-sensing blade passes
the front surface of the magnetic resistance element, the flux
from the magnet passes the magnetic resistance element.
Thus, resistance of the magnetic resistance element increases.
When the vane of the crankshaft-sensing blade does not pass
the front surface of the magnetic resistance element, the flux
from the magnet does not pass the magnetic resistance ele
-
ment and the resistance decreases. The crankshaft position
sensor converts this change in resistance of the magnetic
resistance element to a 5 V pulse signal and outputs it to ECM.
.
INTAKE CAMSHAFT POSITION SENSOR
The intake camshaft position sensor is installed on the left side
of the cylinder head. The intake camshaft position sensor mon
-
itors shape of the half-moon sensing portion and converts to
voltage (pulse signal) that is output to ECM. Upon receiving this
output voltage, the ECM effects feedback control to optimize
the phase of the intake camshaft. Also, ECM uses a combina
-
tion of the intake camshaft position sensor output pulse signal
and crankshaft position sensor output pulse signal to identify
cylinders in the compression process.
AK602265AC
Crank shaft sensing ring
Crank shaft sensing ring Vane
VaneMagnetic resistance element
Magnetic resistance elementMagnet flux
Magnet flux
AK602285AC
5V5V Crankshaft position sensorECM
Output signal Magnetic resistance element
AK602738AC
Camshaft Sensing portionCamshaft position sensor

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-17
The intake camshaft position sensor uses a magnetic resis-
tance element. When the camshaft position sensing portion
passes the front surface of the magnetic resistance element,
the flux from the magnet passes the magnetic resistance ele
-
ment. Thus, resistance of the magnetic resistance element
increases. When the camshaft position sensing portion does
not pass the front surface of the magnetic resistance element,
the flux from the magnet does not pass the magnetic resistance
element and the resistance decreases. The intake camshaft
position sensor converts this change in resistance of the mag
-
netic resistance element to a 5 V pulse signal and outputs it to
ECM
.
EXHAUST CAMSHAFT POSITION SENSOR
The exhaust camshaft position sensor is installed on the right
side of the cylinder head. The exhaust camshaft position sen
-
sor monitors shape of the half-moon sensing portion and con-
verts to voltage (pulse signal) that is output to ECM. Upon
receiving this output voltage, the ECM effects feedback control
to optimize the phase of the exhaust camshaft. The structure
and system of this sensor are basically the same as intake
camshaft position sensor.
.
.
KNOCK SENSOR
A knock sensor is installed on the left side of the cylinder block.
Knock sensor uses the piezoelectric element to convert the
vibration of the cylinder block generated when engine is in
operation to minute voltage that is output to ECM. ECM uses
the minute output voltage from the knock sensor filtered
through the cylinder block's natural frequency to detect knock
-
ing, and compensates the ignition timing lag according to the
strength of the knocking.
AK602574AC
Camshaft position sensing portion
Camshaft position sensing portionMagnetic resistance element
Magnetic resistance elementMagnet flux
Magnet flux
AK602287
5V5V Camshaft position sensorECM
Output signal Magnetic resistance element
AC
AK602739
Piezoelectric element
AC

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-18
.
BAROMETRIC PRESSURE SENSOR
A barometric pressure sensor is built into ECM. The barometric
pressure sensor is a semiconductor diffused pressure element
which outputs voltage to ECM according to atmospheric pres
-
sure. ECM uses this output voltage to sense the altitude of the
vehicle and compensates fuel injection volume to achieve the
appropriate air-fuel ratio for that altitude.
.
ENGINE OIL PRESSURE SWITCH
The engine oil pressure switch is installed on the left side of the
cylinder block. The engine oil pressure switch detects whether
the oil pressure is high or low using the contact switch. When
the oil pressure becomes higher than the specified value after
the engine starts, the contact point of the engine oil pressure
switch opens. This allows the ECM to detect the oil pressure is
higher than the specified value. The ECM outputs the OFF sig
-
nal to the combination meter through the CAN and then turns
off the oil pressure warning lamp.
AK602226AD
5V
Knock sensor
Piezoelectric elementECM
AK602575AC
Barometric pressure sensor
(built in ECM)
AK602587AC
Oil
pressure
Contact switch

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-19
.
POWER STEERING PRESSURE SWITCH
A power steering pressure switch is installed on the power
steering oil pump. The power steering pressure switch uses a
contact switch to detect the power steering oil pressure. When
power steering oil pressure rises due to operation of the steer
-
ing wheel, the power steering load switch outputs an ON signal
to ECM. ECM performs idle-up according to the voltage and
prevents reduction in engine speed due to power steering load
and so maintains stable idle speed.
.
AK602228
ON
OFF
AD
12
0ONOFF ECM terminal voltage V
Oil pressure:lowOil pressure: high Operating pressure
Oil pressure kPa (in.Hg) Engine oil
pressure switch
ECM
AK601174AF
Power steering
pressure switch
Oil
pressure
AK602213
ON
OFF
AE
Oil pressure:low
Oil pressure: highOperating pressure
Power steering
pressure switch12
0OFF
ON
ECM
ECM
terminal voltage V
Oil pressure kPa (in.Hg)

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-20
FUEL TANK DIFFERENTIAL PRESSURE SENSOR
The fuel tank differential pressure sensor is installed to the fuel
pump module. The fuel tank differential pressure sensor out
-
puts the voltage to the ECM using the piezo resistive semicon-
ductor in accordance with the difference between pressure in
the fuel tank and the pressure of the atmosphere. When moni
-
toring the evaporative leak, the ECM detects malfunctions of
the evaporative emission control system by monitoring the
amount of output voltage changes from this sensor. The sensor
characteristics are as shown in the diagram.
.
FUEL TANK TEMPERATURE SENSOR
The fuel tank temperature sensor is installed to the fuel pump
module. The fuel tank temperature sensor detects the tempera
-
ture inside the fuel tank using the resistance change in the ther-
mistor and outputs the voltage to the ECM in accordance with
the temperature inside the fuel tank. The ECM monitors the
evaporative leak in accordance with the fuel tank temperature.
The sensor characteristics are as shown in the diagram.
AK604121Pressure Fuel tank differential
pressure sensorAB
AK604122
5 V
0 GroundOutput voltage V
Pressure kPa (in. Hg) Fuel tank differential pressure sensorECMPower supply
Output signal
AB
AK604123AB
Sensory part
(thermistor) Fuel tank
temperature
sensor
AK604124
ECM
Resistance kΩOutput voltage V
5 V
AB
Fuel tank temperature
sensor (thermistor)
Fuel tank
temperature C (F)Fuel tank
temperature C (F)

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-21
.
GENERATOR FR TERMINAL
Generator turns ON/OFF the power transistor in the voltage
regulator to adjust current flow in the field coil according to
alternator output current. In this way generator's output voltage
is kept adjusted (to about 14.7 V). The ratio of power transistor
ON time (ON duty) is output from generator FR terminal to
ECM. ECM uses this signal to detect generator's output current
and drives throttle actuator control motor according to output
current (electric load). This prevents change in idle speed due
to electric load and helps maintain stable idle speed.
.
AK602229AD
FR BS
Field coil
IC regulator
GeneratorIgnition switch-IG
Battery
ECM

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-22
GENERATOR L TERMINAL
After turning on the ignition switch, the current is input by the
ECM to the generator L terminal. This allows the IC regulator to
be on and the field coil to be excited. When the generator
rotates in this situation, the voltage is excited in the stator coil
and the current is output from B-terminal through the commuta
-
tion diode. Also the generated voltage is input to the voltage
regulator through the commutation diode. After the electric gen
-
eration begins, the current is supplied to the field coil from this
circuit. In addition, the generated voltage is output from the
generator L terminal to the ECM. This allows the ECM to detect
that the electric generation begins. The ECM outputs the ON
signal to the combination meter through the CAN and then
turns off the generator malfunction light.
AK602577
L BS
AC
Battery
GeneratorIC regulator Ignition switch-IG
CAN
communication
Generator
malfunction
light
Combination meterECM
Field coil