Mitsubishi Lancer Evolution X. Manual - part 445

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-845

44

Power supply 
voltage applied to 
manifold absolute 
pressure sensor

Ignition switch: "ON"

4.9 − 5.1 V

45

Manifold absolute 
pressure sensor

Ignition switch: 
"ON"

At altitude of 0 m (0 ft.)

1.2 − 1.8 V

At altitude of 600 m (1,969 
ft.)

1.1 − 1.7 V

At altitude of 1,200 m (3,937 
ft.)

1.0 − 1.6 V

At altitude of 1,800 m (5,906 
ft.)

0.9 − 1.5 V

Engine: warming up, idling

0.46 − 0.66 V

When engine is suddenly revved

Voltage varies

51

Fuel pump relay 1

Engine: While engine is idling after having 
warmed up, suddenly depress the accelerator 
pedal.

From battery 
voltage, it is slightly 
reduced 
temporarily.

52

Turbocharger 
wastegate solenoid 
1

Engine: Warming 
up

Engine is idling

B+

When engine is suddenly 
revved

Voltage drops

53

Turbocharger 
wastegate solenoid 
2

Engine: Warming 
up

Engine is idling

B+

4,000 r/min

Voltage drops

58

Power steering 
pressure switch

Engine: warming 
up, idling

When steering wheel is not 
turned

B+

When steering wheel is 
turned

1 V or less

60

Generator G 
terminal

• Engine: warming up, idling
• Radiator fan: stopped
• Headlight: OFF to ON*

2

• Stop light: OFF to ON
• Rear defogger switch: OFF to ON

Voltage increases

61

Generator FR 
terminal

• Engine: warming up, idling
• Radiator fan: stopped
• Headlight: OFF to ON*

2

• Stop light: OFF to ON
• Rear defogger switch: OFF to ON

Voltage drops

62

Generator L 
terminal

Ignition switch: "ON"

0.5 − 2.0 V

Engine: idling

B+

72

Power supply 
voltage applied to 
throttle actuator 
control motor

Ignition switch: "ON"

B+

73

MFI relay (power 
supply)

Ignition switch: "LOCK" (OFF)

B+

Ignition switch: "ON"

1 V or less

TERMINAL 
NO.

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-846

74

Accelerator pedal 
position sensor 
(main)

Ignition switch: 
"ON"

Release the accelerator 
pedal

0.9 − 1.1 V

Depress the accelerator 
pedal fully

4 V or more

75

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

Ignition switch: "ON"

4.9 − 5.1 V

77

Accelerator pedal 
position sensor 
(sub)

Ignition switch: 
"ON"

Release the accelerator 
pedal

0.4 − 0.6 V

Depress the accelerator 
pedal fully

2 V or more

78

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

Ignition switch: "ON"

4.9 − 5.1 V

82

Power supply

Ignition switch: "ON"

B+

84

Throttle actuator 
control motor relay

Ignition switch: "ON" → "LOCK" (OFF)

1 V or less → B+ → 

1 V or less

85

Clutch pedal 
position switch 
<M/T>

Ignition switch: 
"ON"

Release the clutch pedal

10 V or more

Depress the clutch pedal 
fully

1 V or less

87

Mass airflow sensor Engine is revved

Voltage increases 
in response to 
revving

89

Intake air 
temperature sensor 
1

Ignition switch: 
"ON"

When intake air temperature 
is − 20° C (− 4° F)

3.8 − 4.4 V

When intake air temperature 
is 0° C (32° F)

3.2 − 3.8 V

When intake air temperature 
is 20° C (68° F)

2.3 − 2.9 V

When intake air temperature 
is 40° C (104° F)

1.5 − 2.1 V

When intake air temperature 
is 60° C (140° F)

0.8 − 1.4 V

When intake air temperature 
is 80° C (176° F)

0.4 − 1.0 V

92

Ignition switch-IG

Ignition switch: "ON"

B+

96

Fuel pump relay 2

Ignition switch: "ON"

B+

Engine: idling

1.0 V or less

TERMINAL 
NO.

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-847

98

Intake air 
temperature sensor 
2

Ignition switch: 
"ON"

When intake air temperature 
is −20° C (−4° F)

3.8 − 4.4 V

When intake air temperature 
is 0° C (32° F)

3.2 − 3.8 V

When intake air temperature 
is 20° C (68° F)

2.3 − 2.9 V

When intake air temperature 
is 40° C (104° F)

1.5 − 2.1 V

When intake air temperature 
is 60° C (140° F)

0.8 − 1.4 V

When intake air temperature 
is 80° C (176° F)

0.4 − 1.0 V

102

A/C compressor 
clutch relay

• Engine: idling
• A/C switch: OFF → ON (A/C compressor is 

operating)

B+ → 1 V or less as 

A/C clutch cycles

104

Backup power 
supply

Ignition switch: "LOCK" (OFF)

B+

105

Ignition switch-ST

Ignition switch: cranking

8 V or more

106

Starter relay

Engine: cranking

B+

Engine: idling

1 V or less

112

Fuel tank differential 
pressure sensor

• Ignition switch: "ON"
• Fuel cap removal

1.5 − 3.5 V

114

Power supply 
voltage applied to 
fuel tank differential 
pressure sensor

Ignition switch: "ON"

4.9 − 5.1 V

115

Fuel tank 
temperature sensor

Ignition switch: 
"ON"

When fuel tank temperature 
is 0° C (32° F)

2.7 − 3.1 V

When fuel tank temperature 
is 20° C (68° F)

2.1 − 2.5 V

When fuel tank temperature 
is 40° C (104° F)

1.6 − 2.0 V

When fuel tank temperature 
is 80° C (176° F)

0.8 − 1.2 V

117

Evaporative 
emission ventilation 
solenoid

Ignition switch: "ON"

B+

Carry out the actuator test to drive the solenoid 
valve.

1 V or less 
(Approximately 6 
seconds)

TERMINAL 
NO.

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-848

TERMINAL RESISTANCE AND CONTINUITY CHECK

AK502911

82 81 80 79 78 77 76 75 74 73 72 71

94 93 92 91 90 89 88 87 86 85 84 83

99 98 97 96 95

100

101

102

103

104

105

106

112

113

114

109 108

107

110

111

115

116

117

118

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

B-09

B-10

AT

Engine-ECU harness side connector

TERMINAL 
NO. 

INSPECTION ITEM

NORMAL CONDITION (INSPECTION 
CONDITION)

1 − 82

Intake engine oil control valve

6.9 − 7.9 Ω [at 20° C (68° F)]

15 − 16

Throttle actuator control motor

0.3 − 80 Ω [at 20° C (68° F)]

17 − 82

Exhaust engine oil control valve

6.9 − 7.9 Ω [at 20° C (68° F)]

26 − 27

Engine coolant temperature sensor

14 − 17 kΩ [when engine coolant temperature is 
− 20° C (− 4° F)]
5.1 − 6.5 kΩ [when engine coolant temperature 

is 0° C (32° F)]
2.1 − 2.7 kΩ [when engine coolant temperature 

is 20° C (68° F)]
0.9 − 1.3 kΩ [when engine coolant temperature 

is 40° C (104° F)]
0.48 − 0.68 kΩ [when engine coolant 

temperature is 60° C (140° F)]
0.26 − 0.36 kΩ [when engine coolant 

temperature is 80° C (176° F)]

34 − 82

Heated oxygen sensor (front) heater

4.5 − 8.0 Ω [at 20° C (68° F)]

35 − 82

Heated oxygen sensor (rear) heater

4.5 − 8.0 Ω [at 20° C (68° F)]

37 − 82

Evaporative emission purge solenoid

22 − 26 Ω [at 20° C (68° F)]

52 − 82

Turbocharger wastegate solenoid 1

29 − 35 Ω [at 20° C (68° F)]

53 − 82

Turbocharger wastegate solenoid 2

29 − 35 Ω [at 20° C (68° F)]

71 − Body 

ground

ECM ground

Continuity (2 Ω or less)

81 − Body 

ground
83 − Body 

ground
93 − Body 

ground
82 − 117

Evaporative emission ventilation solenoid

17 − 21 Ω [at 20° C (68° F)]