Mitsubishi Outlander (2013+). Manual — part 132

SENSOR

MULTIPOINT FUEL INJECTION (MPI)

13A-12

Accelerator pedal position sensor is integrated with
accelerator pedal, and detects accelerator opening
angle. Engine-ECU 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-con-
tact type.

STRUCTURE AND SYSTEM

Accelerator pedal position sensor is composed of a
permanent magnet fixed on the magnet carrier of the
pedal shaft, Hall IC 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.
The accelerator pedal position sensor has 2 output
systems

− accelerator pedal position sensor (main)

and accelerator pedal position sensor (sub), and the
output voltage is output to engine-ECU. According to
depression of the accelerator pedal, output voltage
of the accelerator pedal position sensor (main) and
accelerator pedal position sensor (sub) changes.
This allows engine-ECU to detect the actual acceler-
ator pedal depression amount. Engine-ECU uses
accelerator pedal position sensor (main) output volt-
age for appropriate throttle valve opening angle con-
trol and fuel injection volume control. Also,
engine-ECU compares output voltage of the acceler-
ator pedal position sensor (main) and accelerator
pedal position sensor (sub) to check for abnormality
in sensor. The relationship between accelerator
opening angle and output voltage of the accelerator
pedal position sensor (main) and accelerator pedal
position sensor (sub) is as shown in the figure below.

AK602570AB

Magnet

Pedal shaft

Hall IC

AK602211

5V

5V

5

4

3

2

1

0

AD

Accelerator pedal position sensor

Accelerator pedal
position sensor (main)

Accelerator pedal
position sensor (main)

Accelerator
pedal stroke

Accelerator pedal
position sensor (sub)

Accelerator pedal
position sensor (sub)

Hall IC

Hall IC

Full throttle
point

Output voltage (V)

Engine-ECU

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SENSOR

MULTIPOINT FUEL INJECTION (MPI)

13A-13

When abnormality is detected

Engine-ECU compares output voltage of the acceler-
ator pedal position sensor (main) and accelerator
pedal position sensor (sub) to check for abnormality
in sensor. If the engine-ECU detects the abnormality,
the emergency should be prevented by performing
the fuel-safe control.

• When 1-system malfunctions

The engine-ECU should detect the amount of

accelerator pedal depressed by only using the
signal having no malfunctions. Depressing
the accelerator pedal half way can perform
the control. Performing the fuel cut can
increase the engine rotation speed.

• When 2-system malfunctions

The engine-ECU should cut the energization of

the throttle valve control servo. At that time,
the spring built in the throttle valve can slightly
open the throttle valve. This allows the
engine-ECU to control the engine output.

OXYGEN SENSOR

The oxygen sensor (front) is installed in the exhaust
manifold. The oxygen sensor (rear) is installed in the
exhaust front pipe.
Oxygen sensor has a built-in heater to help early
activation of the sensor. This allows feedback control
of air-fuel ratio soon after engine start.

This sensor uses the oxygen concentration cell prin-
ciple of solid electrolyte (zirconia) and displays the
property of sudden change in output voltage near
theoretical air-fuel ratio. This property is used to
detect oxygen density in exhaust gas. Feedback to
engine-ECU allows it to judge whether air-fuel ratio is
rich or lean compared to theoretical air-fuel ratio.
This allows engine-ECU precise feedback control to
get theoretical air-fuel ratio with best cleaning effi-
ciency of 3-way catalytic converter.

AKB00595

Throttle
position
sensor

Main

Restrict or shut off
the operating

Main

Sub

Sub

Accelerator
pedal position
sensor

Engine-ECU

Fuel cut

Injector

Throttle valve
control servo

AB

AKB00751AB

Sensing
area

Sensing
area

Front

Rear

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SENSOR

MULTIPOINT FUEL INJECTION (MPI)

13A-14

CRANK ANGLE SENSOR

A crank angle sensor is installed on the exhaust side
of the cylinder block. The crank angle sensor moni-
tors rotation of crankshaft sensing ring (36 teeth
including 3 missing teeth) installed on the crankshaft
and converts to voltage (pulse signal) that is output
to engine-ECU. Engine-ECU uses crank angle sen-
sor's output pulse to detect crankshaft position.

The crank angle sensor uses a magnetic resistance
element. When the vane of the crankshaft-sensing
ring passes the front surface of the magnetic resist-
ance 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 ring does not pass
the front surface of the magnetic resistance element,

AK602576AB

From engine control relay

Oxygen sensor

Heater

Zirconia element

Engine-ECU

0.5V

AK602737AE

Crank angle
sensor

Crankshaft sensing ring
(36 teeth including 3 missing teeth)

AK602265AD

Crankshaft sensing ring

Crankshaft sensing ring

Vane

Vane

Magnetic resistance element

Magnetic resistance element

Magnet flux

Magnet flux

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SENSOR

MULTIPOINT FUEL INJECTION (MPI)

13A-15

the flux from the magnet does not pass the magnetic
resistance element and the resistance decreases.
The crank angle sensor converts this change in
resistance of the magnetic resistance element to a 5
V pulse signal and outputs it to engine-ECU.

INLET CAMSHAFT POSITION SENSOR

The inlet camshaft position sensor is installed on the
inlet side of the cylinder head. The inlet camshaft
position sensor monitors shape of the half-moon
sensing portion and converts to voltage (pulse sig-
nal) that is output to engine-ECU. Upon receiving this
output voltage, the engine-ECU effects feedback
control to optimize the phase of the inlet camshaft.
Also, engine-ECU uses a combination of the cam-
shaft position sensor output pulse signal and crank-
shaft position sensor output pulse signal to identify
cylinders in the compression process.

The inlet camshaft position sensor uses a magnetic
resistance element. When the camshaft position
sensing portion passes the front surface of the mag-
netic resistance element, the flux from the magnet
passes the magnetic resistance element. Thus,
resistance of the magnetic resistance element
increases. When the camshaft position sensing por-
tion does not pass the front surface of the magnetic
resistance element, the flux from the magnet does

AK602285AB

5V

5V

Crank angle sensor

Engine-ECU

Output signal

Magnetic resistance element

AK602738AB

Camshaft

Sensing portion

Camshaft position sensor

AK602574AE

Camshaft position sensing portion

Camshaft position sensing portion

Magnetic resistance element

Magnetic resistance element

Magnet flux

Magnet flux

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