Mitsubishi Eclipse. Manual - part 635

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1083

51

55

Barometric 
pressure sensor

Ignition switch: 
"ON"

When altitude is 0 m (0 ft)

3.7 

− 4.3 volts

When altitude is 600 m 
(1,969 ft)

3.4 

− 4.0 volts

When altitude is 1,200 m 
(3,937 ft)

3.2 

− 3.8 volts

When altitude is 1,800 m 
(5,906 ft)

2.9 

− 3.5 volts

50

56

Camshaft position 
sensor

Engine: cranking

0.4 

− 3.0 volts

Engine: idling

0.5 

− 2.0 volts

68

58

Ignition switch-ST Engine: cranking

8 volts or more

65

61

A/C switch 2

• Engine: idling

• Outside air 

temperature: 
25

°C or more

When A/C is maximum 
cooling condition (when 
the load by A/C is high)

B+

When A/C is maximum 
heating condition (when 
the load by A/C is low)

1 volt or less

62

64

Intake air 
temperature 
sensor

Ignition switch: 
"ON"

When Intake air 
temperature is 

−20°C 

(

−4°F)

3.8 

− 4.4 volts

When Intake air 
temperature is 0

°C (32°F)

3.2 

− 3.8 volts

When Intake air 
temperature is 20

°C (68°F)

2.3 

− 2.9 volts

When Intake air 
temperature is 40

°C 

(104

°F)

1.5 

− 2.1 volts

When Intake air 
temperature is 60

°C 

(140

°F)

0.8 

− 1.4 volts

When Intake air 
temperature is 80

°C 

(176

°F)

0.4 

− 1.0 volt

61

65

Volume airflow 
sensor

Engine: idling

2.2 

− 3.2 volts

Engine: 2,500 r/min

60

66

Backup power 
supply

Ignition switch: "LOCK" (OFF)

B+

71

71

Left bank heated 
oxygen sensor 
(front)

• Engine: warming up, 2,500 r/min (check 

using a digital voltmeter)

0 

⇔ 0.8 volt 

(changes 
repeatedly) 

72

72

Right bank 
heated oxygen 
sensor (front)

• Engine: warming up, 2,500 r/min (check 

using a digital voltmeter)

0 

⇔ 0.8 volt 

(changes 
repeatedly) 

73

73

Left bank heated 
oxygen sensor 
(rear)

• Engine: warming up

• Revving

0 and 0.6 

− 1.0 

volt alternates

TERMINAL 
NO. <M/T>

TERMINAL 
NO. <A/T>

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1084

74

74

Right bank 
heated oxygen 
sensor (rear)

• Engine: warming up

• Revving

0 and 0.6 

− 1.0 

volt alternates

78

78

Throttle position 
sensor

Ignition switch: 
"ON" (check for 
smooth voltage 
increase as 
throttle is moved 
from idle position 
to wide open 
throttle)

Idling

0.535 

− 0.735 

volt

Wide open throttle

4.5 

− 5.5 volts

79

79

Idle position 
signal

Ignition switch: 
"ON" 

Set throttle valve to idle 
position

0 

− 1 volt

Open throttle slightly

4 volts or more

80

−

Vehicle speed 
sensor

• Ignition switch: "ON" 

• Move the vehicle slowly forward

0 

⇔ 8 −12 volts 

(changes 
repeatedly)

83

83

A/C switch

Engine: idling

Turn the A/C switch OFF

1 volt or less 

Turn the A/C switch ON 
(A/C compressor is 
operating)

B+

92

91

Manifold absolute 
pressure sensor

Engine stopped [At altitude of 0 m (0 ft.)]

3.8 - 4.2 volts

Engine stopped [At altitude of 600 m (1,969 
ft.)]

3.5 - 3.9 volts

Engine stopped [At altitude of 1,200 m (3,937 
ft.)]

3.3 - 3.7 volts

Engine stopped [At altitude of 1,800 m (5,906 
ft.)]

3.0 - 3.4 volts

Engine: idling

0.8 

− 2.4 volts

• Engine: idling

• Suddenly depress the accelerator pedal

varies

93

92

Fuel tank 
differential 
pressure sensor

Engine: idling

1.2 

− 3.8 volts

99

98

Ignition switch-IG Ignition switch: "ON" 

B+

TERMINAL 
NO. <M/T>

TERMINAL 
NO. <A/T>

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1085

TERMINAL RESISTANCE AND CONTINUITY CHECK

AK000059

ECM <M/T> or PCM <A/T> Connector Terminal Arrangement

<M/T>

<A/T>

AB

78

91

71

59

68

47

58

67

56

66

55 54

65

53

64

52

63

46

51

62

44

49

61

42

48

60

41

23

35

8

22 21

34

7

20

33

6

19

32

18

31

17 16

30

15

29

14

28

5

13

27

4

12 11

26

3

10

25

2

9

24

1

23

35

8

47

58

41

48

59

50

60

51

61

52

62

53

54

63

42

55

64

44

56

65

45

57

66

46

78

90

71

79

91

72

81

92

82

93

83

84

94

85

95

86

96

74

88

97

76

89

98

77

108

121

101

109

122

110

123

102

112

124

113

114

125

115

126

116

127

117

128

104

119

129

106

120

130

107

118

105

111

103

87

75

80

73

49

43

22 21

34

7

20

33

6

19

32

18

31

17 16

30

15

29

14

28

5

13

27

4

12 11

26

3

10

25

2

9

24

1

50

43

57

45

79

92

80

93

83

84

95

86

97

87

98

89

99

72

82

94

74

85

96

76

90

100

77

88

75

81

73

TERMINAL 
NO. <M/T>

TERMINAL 
NO. <A/T>

INSPECTION ITEM

NORMAL CONDITION (INSPECTION 
CONDITION)

1 

− 47

1 

− 41

No.1 injector

13 

− 16 ohms [at 20°C (68°F)]

9 

− 47

9 

− 41

No.2 injector

24 

− 47

24 

− 41

No.3 injector

2 

− 47

2 

− 41

No.4 injector

10 

− 47

10 

− 41

No.5 injector

25 

− 47

25 

− 41

No.6 injector

3 

− 47

3 

− 41

Left bank heated oxygen sensor 
heater (front)

4.5 

− 8.0 ohms [at 20°C (68°F)]

4 

− 47

4 

− 41

Right bank heated oxygen sensor 
heater (front)

4.5 

− 8.0 ohms [at 20°C (68°F)]

6 

− 47

6 

− 41

EGR vacuum regulator solenoid 
valve

29 

− 35 ohms [at 20°C (68°F)]

14 

− 47

14 

− 41

Stepper motor coil (A1)

28 

− 33 ohms [at 20°C (68°F)]

28 

− 47

28 

− 41

Stepper motor coil (A2)

15 

− 47

15 

− 41

Stepper motor coil (B1)

29 

− 47

29 

− 41

Stepper motor coil (B2)

26 

− 47

26 

− 41

Left bank heated oxygen sensor 
heater (rear)

11 

− 18 ohms [at 20°C (68°F)]

27 

− 47

27 

− 41

Right bank heated oxygen sensor 
heater (rear) 

11 

− 18 ohms [at 20°C (68°F)]

16 

− 47

34 

− 41

Evaporative emission purge 
solenoid

30 

− 34 ohms [at 20°C (68°F)]

35 

− 47

35 

− 41

Evaporative emission ventilation 
solenoid

17 

− 21 ohms [at 20°C (68°F)]

46 

− Body 

ground

42 

− Body 

ground

ECM or PCM ground

Continuity (2 ohm or less)

58 

− Body 

ground

48 

− Body 

ground

ECM or PCM ground

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1086

INSPECTION PROCEDURE USING AN OSCILLOSCOPE

M1131154500598

VOLUME AIRFLOW SENSOR

Required Special Tool:

• MB991709: Test Harness

.

Measurement Method
1. Disconnect the volume airflow sensor connector, and 

connect the test harness special tool (MB991709) in 
between. (All terminals should be connected.)

2. Connect the oscilloscope probe to volume airflow sensor 

connector terminal 3.

.

Alternate method (Test harness not available)

<M/T>

1. Connect the oscilloscope probe to ECM terminal 61.

<A/T>

1. Connect the oscilloscope probe to PCM terminal 65.

44 

− 49

44 

− 57

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)]

32 

− 47

53 

− 41

Intake manifold tuning solenoid

29 

− 35 ohms [at 20°C (68°F)]

62 

− 49

64 

− 57

Intake air temperature sensor

13 

− 17 kΩ [when intake air temperature is 

−20°C (−4°F)]
5.3 

− 6.7 kΩ [when intake air temperature 

is 0

°C (32°F)]

2.3 

− 3.0 kΩ [when intake air temperature 

is 20

°C (68°F)]

1.0 

− 1.5 kΩ [when intake air temperature 

is 40

°C (104°F)]

0.56 

− 0.76 kΩ [when intake air 

temperature is 60

°C (140°F)]

0.30 

− 0.42 kΩ [when intake air 

temperature is 80

°C (176°F)]

TERMINAL 
NO. <M/T>

TERMINAL 
NO. <A/T>

INSPECTION ITEM

NORMAL CONDITION (INSPECTION 
CONDITION)

AK302581

1 2 3 4 5 6 7

AB

VOLUME AIRFLOW
SENSOR CONNECTOR

OSCILLOSCOPE

MB991709