Mitsubishi Evolution X. Manual — part 119

CONTROL UNIT

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-5

CONTROL UNIT

M2132021500391

ENGINE CONTROL MODULE (ECM)

ECM is installed in the engine room. ECM judges
(calculates) the optimum control to deal with the con-
stant minute changes in driving conditions based on
information input from the sensors and drives the
actuator. ECM is composed of 32-bit microprocessor
and Random Access Memory (RAM), Read Only
Memory (ROM) and Input /Output interface. ECM

uses flash-memory ROM that allows re-writing of
data so that change and correction of control data is
possible using special tools. It also uses Electrically
Erasable Programmable Read Only Memory
(EEPROM) so that studied compensation data is not
deleted even if battery terminals are disconnected.

AK604119

ECM

Microprocessor

RAM

Input
interface

Output
interface

Input
sensor

Output
actuator

AB

ROM

CONTROL UNIT

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MULTIPORT FUEL SYSTEM (MFI)

13A-6

ECM CONNECTOR INPUT/OUTPUT PIN ARRANGEMENT

AK704675 AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

91

90

89

87

86

84

85

83

82

88

92

93

94

95

96

97

98

99

109

108

107

106

105

104

103

102

112

113

114

115

116

117

118

100

101

111

110

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

63

61

62

64

71

72

73

74

75

76

77

78

79

80

81

1

Intake engine oil control valve

2

No.1 injector

3

No.2 injector

4

No.1 ignition coil (ignition power
transistor)

5

No.2 ignition coil (ignition power
transistor)

6

Starter active signal

7

Exhaust camshaft position sensor

8

Crankshaft position sensor

9

Sensor supplied voltage

10

Throttle position sensor (main)

11

Throttle position sensor (sub)

12

Power supply voltage applied to throttle
position sensor

13

Throttle position sensor ground

14

Intake camshaft position sensor

15

Throttle actuator control motor (+)

16

Throttle actuator control motor (-)

17

Exhaust engine oil control valve

18

No.3 injector

19

No.4 injector

20

No.3 ignition coil (ignition power
transistor)

21

No.4 ignition coil (ignition power
transistor)

23

Exhaust camshaft position sensor
ground

24

Crankshaft position sensor ground

25

Knock sensor (+)

26

Engine coolant temperature sensor

27

Engine coolant temperature sensor
ground

30

Intake camshaft position sensor ground 34

Heated oxygen sensor (front) heater

35

Heated oxygen sensor (rear) heater

36

Engine oil pressure switch

37

Evaporative emission purge solenoid

38

Heated oxygen sensor (front)

39

Heated oxygen sensor (front) offset
voltage

40

Heated oxygen sensor (rear)

41

Heated oxygen sensor (rear) offset
voltage

42

Knock sensor (

−)

44

Power supply voltage applied to
manifold absolute pressure sensor

45

Manifold absolute pressure sensor

46

Manifold absolute pressure sensor
ground

51

Fuel pump relay 1

52

Turbocharger wastegate solenoid 1

53

Turbocharger wastegate solenoid 2

58

Power steering pressure switch

60

Generator G terminal

61

Generator FR terminal

62

Generator L terminal

SENSOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-7

SENSOR

M2132001000811

.

MASS AIRFLOW SENSOR

Mass airflow sensor is installed in the air intake hose. Mass air-
flow sensor is composed of an extremely small heatsensing
resistor. The mass airflow sensor controls the amount of elec-
tric current flowing into the heat sensing resistor to keep the
heat sensing resistor at a constant temperature to the intake air
temperature. When the air mass flow rate increases, the air
flow speed is higher and also the amount of heat transfer from
the heat sensing resistor to the air increased. Therefore, the
mass airflow sensor increases the amount of electric current to
the heat sensing resistor. Thus, the amount of electric current
increases in accordance with the air mass flow rate. The mass
airflow sensor measures the air mass flow rate by detecting the
amount of electric current. The mass airflow sensor amplifies
the detected electric current amount and outputs it into the
ECM. ECM uses this output current and engine speed to calcu-
late and decide basic fuel injection time. Sensor properties are
as shown in the figure.

71

Throttle actuator control motor ground

72

Throttle actuator control motor power
supply

73

MFI relay (power supply)

74

Accelerator pedal position sensor
(main)

75

Power supply voltage applied to
accelerator pedal position sensor
(main)

76

Accelerator pedal position sensor
(main) ground

77

Accelerator pedal position sensor (sub) 78

Power supply voltage applied to
accelerator pedal position sensor (sub)

79

Accelerator pedal position sensor (sub)
ground

81

ECM ground

82

Power supply

83

Throttle actuator control motor ground

84

Throttle actuator control motor relay

85

Clutch pedal position switch <M/T>

87

Mass airflow sensor

88

Mass airflow sensor ground

89

Intake air temperature sensor 1

90

CAN interface (high)

91

CAN interface (low)

92

Ignition switch-IG

93

ECM ground

96

Fuel pump relay 2

97

Intake air temperature sensor 2 ground 98

Intake air temperature sensor 2

102

A/C compressor relay

103

Flash EP-ROM power supply

104

Backup power supply

105

Ignition switch-ST

106

Starter relay

112

Fuel tank differential pressure sensor

113

Fuel tank differential pressure sensor
ground

114

Power supply voltage applied to fuel
tank differential pressure sensor

115

Fuel tank temperature sensor

117

Evaporative emission ventilation
solenoid

AK602252AC

Sensing area

Silicon substrate

Heat sensing
resistor

Intake air

Diaphragm

SENSOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-8

.

INTAKE AIR TEMPERATURE SENSOR 1

Intake air temperature sensor 1 is built in to the mass airflow
sensor. Intake air temperature sensor 1 detects intake air tem-
perature through thermistor's resistance change and outputs
the voltage according to intake air temperature to ECM. ECM
uses this output voltage to compensate fuel injection control
and ignition timing control. Sensor properties are as shown in
the figure.

.

AK602221AG

From MFI relay

Mass airflow sensor

ECM

Output current mA

Mass flow g/s

AK602253AC

Sensory part
(thermistor)

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