Mitsubishi Evolution X. Manual — part 120

SENSOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-9

MANIFOLD ABSOLUTE PRESSURE SENSOR

The manifold absolute pressure sensor is installed in the intake
manifold. Manifold absolute pressure sensor uses a piezo
resistive semiconductor to output the voltage according to man-
ifold absolute pressure to ECM. ECM uses this output voltage
to compensate fuel injection volume according to manifold
absolute pressure. Sensor properties are as shown in the fig-
ure.

.

INTAKE AIR TEMPERATURE SENSOR 2

Intake air temperature sensor 2 is installed in the intake mani-
fold. Intake air temperature sensor 2 detects intake air temper-
ature in the intake manifold through thermistor's resistance
change and outputs the voltage according to intake air temper-
ature in the intake manifold to ECM. ECM uses this output volt-
age to compensate fuel injection control. Sensor properties are
as shown in the figure.

AK602254AC

Pressure

Manifold absolute
pressure sensor

AK602206 AJ

5 V

0

307

5 V

Ground

Output voltage V

Pressure kPa (in.Hg)

Manifold absolute
pressure sensor

Power supply

Output signal

ECM

AK604260 AD

Intake air temperature sensor 2

Sensory part
(thermistor)

SENSOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-10

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ENGINE COOLANT TEMPERATURE SENSOR

The engine coolant temperature sensor is installed in the ther-
mostat housing. Engine coolant temperature sensor uses ther-
mistor's resistance change to detect coolant temperature and
output the voltage according to coolant temperature to ECM.
ECM uses this output voltage to appropriately control fuel injec-
tion volume, idle speed and ignition timing. Sensor properties
are as shown in the figure.

.

AK602207

Intake air
temperature ˚C (˚F)

AG

Resistance k

Ω

Output voltage V

Intake air temperature
sensor (thermistor)

5V

Intake air
temperature ˚C (˚F)

ECM

AK602255AC

Sensory part
(thermistor)

AK602208

Engine coolant
temperature ˚C (˚F)

AG

Output voltage V

5V

Engine coolant
temperature sensor
(thermistor)

Engine coolant
temperature ˚C (˚F)

ECM

Resistance k

Ω

SENSOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-11

THROTTLE POSITION SENSOR

The throttle position sensor is installed in the throttle body.
Throttle position sensor outputs voltage to ECM based on the
throttle shaft rotation angle. ECM uses this signal to detect the
throttle valve opening angle to perform throttle actuator control
motor feedback control. This throttle position sensor uses Hall
IC and is a non-contact type.

.

STRUCTURE AND SYSTEM

Throttle position sensor is composed of a permanent magnet
fixed on the throttle shaft, Hall IC that outputs voltage according
to magnetic flux density and a stator that efficiently introduces
magnetic flux from the permanent magnet to Hall IC.

Magnetic flux density at Hall IC is proportional to the output
voltage.
Throttle position sensor has 2 output systems

− throttle position

sensor (main) and throttle position sensor (sub), and the output
voltage is output to ECM. When throttle valve turns, output volt-
age of throttle position sensor (main) and throttle position sen-
sor (sub) changes. This allows ECM to detect actual throttle
opening angle. ECM uses this output voltage for throttle actua-
tor control motor feedback control. Also, ECM compares output
voltage of the throttle position sensor (main) and throttle posi-
tion sensor (sub) to check for abnormality in the throttle position
sensor. The relationship between throttle opening angle and
output voltage of the throttle position sensor (main) and throttle
position sensor (sub) is as shown in the figure below.

AK702846

AD

Throttle body

Throttle
position
sensor

AK602566AC

Hall IC

Stator

Yoke

Fixed to the motor cover

Magnet

Throttle shaft

To ECM

AK604555

Magnet flux

Fully opened

Fully closed

Hall IC

Half opened

Hall IC

AB

SENSOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-12

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ACCELERATOR PEDAL POSITION SENSOR

Accelerator pedal position sensor is integrated with accelerator
pedal, and detects accelerator opening angle. ECM uses the
output voltage of this sensor to control appropriate throttle
valve opening angle and fuel injection volume. This accelerator
pedal position sensor uses Hall IC and is a non-contact type.

.

AK602222AE

5V

5V

Throttle position sensor

Throttle valve opening angle

5

2.5

4.5

0.5

0

Throttle position
sensor (main)

Throttle position
sensor (sub)

Throttle position
sensor (sub)

Throttle position
sensor (main)

Hall IC

Fully
closed

Fully
opened

Hall IC

Output voltage V

ECM

AK602569 AC

Accelerator pedal position
sensor connector

Accelerator pedal arm