Mitsubishi Eclipse. Manual - part 634

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1079

FUEL 
PUMP

07

Fuel pump Fuel pump 

operates 
and fuel is 
recirculated

• Ignition 

switch: 
"ON"

• Fuel 

pump: 
activated

Inspect 
according 
to both the 
above 
conditions

Pinch the 
return hose 
with fingers 
to feel the 
pulse of the 
fuel being 
recirculated

Pulse is felt Procedure 

No. 29

P.13B-103
0

Listen near 
the fuel 
tank for the 
sound of 
fuel pump 
operation

Sound of 
operation is 
heard

NO. 1 
INJECT
OR

01

Injectors

Cut fuel to 
No. 1 
injector

Engine: warm, idle (cut 
the fuel supply to each 
injector in turn and check 
cylinders which don't 
affect idling.)

Idling 
condition 
becomes 
different 
(becomes 
unstable)

Code No. 
P0201

P.13B-510

NO. 2 
INJECT
OR

02

Cut fuel to 
No. 2 
injector

Code No. 
P0202

P.13B-521

NO. 3 
INJECT
OR

03

Cut fuel to 
No. 3 
injector

Code No. 
P0203

P.13B-510

NO. 4 
INJECT
OR

04

Cut fuel to 
No. 4 
injector

Code No. 
P0204

P.13B-521

NO. 5 
INJECT
OR

05

Cut fuel to 
No. 5 
injector

Code No. 
P0205

P.13B-510

NO. 6 
INJECT
OR

06

Cut fuel to 
No. 6 
injector

Code No. 
P0206

P.13B-521

RADIAT
. FAN 
LO

21

Fan 
controller

Drive the 
fan motor

Ignition switch: "ON"

Radiator fan 
and A/C 
condenser 
fan rotate at 
high speed

Procedure 
No. 27

P.13B-100
8

VIC 
SOLEN 
OID

11

Intake 
manifold 
tuning 
solenoid

Solenoid 
valve turns 
from OFF to 
ON.

Ignition switch: "ON"

Clicks when 
solenoid 
valve is 
driven

Code No. 
P0660

P.13B-844

MUT-III 
SCAN 
TOOL 
DISPLAY

ITEM 
NO.

INSPECTION 
ITEM

DRIVE 
CONTENTS

INSPECTION 
REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1080

CHECK AT THE ENGINE CONTROL MODULE (ECU) <M/T> OR POWERTRAIN 
CONTROL MODULE (PCM) <A/T>

M1131153700210

TERMINAL VOLTAGE CHECK CHART

AK000057

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

<M/T>

<A/T>

AB

1

2

3

4

5

6

7

8

41

48 49 50 51 52 53 54 55 56 57 58

60 61

62 63 64

65 66

67

42 43 44

45 46

59

68

47

41

47

48 49 50 51 52 53 54 55 56 57

58

59

60 61 62 63

64 65

42 43

71

78 79 80

90 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

113114

125

115

126

116

127

117

128

104

119

129

106

120

130

107

118

105

111

103

87

75

73

44 45 46

66

78

91

71

79

92

80

93

83 84

95

85

96

86

97

87

98

72

82

94

74

89

99

76

90

100

77

88

75

81

73

9

10

11 12 13 14 15 16 17 18 19 20 21 22 23

24

25

26 27 28 29

30 31 32 33

34 35

1

2

3

4

5

6

7

8

9

10

11 12 13 14 15 16 17 18 19 20 21 22 23

24

25

26 27 28 29

30 31 32 33

34 35

TERMINAL 
NO. <M/T>

TERMINAL 
NO. <A/T>

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION

1

1

No.1 injector

• Engine: warming up, idling

• Suddenly depress the accelerator pedal

From 11 

− 14 

volts 
momentarily 
drops slightly

9

9

No.2 injector

24

24

No.3 injector

2

2

No.4 injector

10

10

No.5 injector

25

25

No.6 injector

3

3

Left bank heated 
oxygen sensor 
heater (front)

Engine: warming up, idling

9 

− 11 volts

Engine: Revving

9 

− 11 volts → 

B+ 
(momentarily)

4

4

Right bank 
heated oxygen 
sensor heater 
(front)

Engine: warming up, idling

9 

− 11 volts

Engine: Revving

B+

6

6

EGR vacuum 
regulator solenoid 
valve

Ignition switch: "ON"

B+

• Engine: idling

• Suddenly depress the accelerator pedal.

From B+, drops 
momentarily 

8

8

Generator G 
terminal

• Engine: warming up, idling (radiator fan: 

stopped)

• Headlight: OFF to ON

• Rear defogger switch: OFF to ON

• Stop light switch: OFF to ON

Voltage rises by 
0.2 

− 3.5 volt

52

54

Generator FR 
terminal

• Engine: warming up, idling (radiator fan: 

stopped)

• Headlight: OFF to ON

• Rear defogger switch: OFF to ON

• Stop light switch: OFF to ON

Voltage drops

11

11

Ignition power 
transistor

Engine: 3,000 r/min

0.3 

− 3.0 volt

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1081

14

14

Stepper motor 
coil <A1>

• Engine: warming up, idling

• A/C switch: OFF → ON 

• Headlight switch: OFF → ON

B+ 

⇔ 1 volt or 

less (changes 
repeatedly)

28

28

Stepper motor 
coil <A2>

15

15

Stepper motor 
coil <B1>

29

29

Stepper motor 
coil <B2>

18

18

Fan controller

Radiator fan and A/C condenser fan are not 
operating

0 

− 0.3 volt

Radiator fan and A/C condenser fan are 
operating

0.7 volt or more

19

19

Volume airflow 
sensor reset 
signal

Engine: idling

0 

− 1 volt

Engine: 3,000 r/min

6 

− 9 volts

21

21

Fuel pump relay

Ignition switch: "ON"

B+

Engine: idling

0 

− 3 volts

20

20

A/C compressor 
clutch relay

• Engine: idling

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

operating)

B+ 

→ 1 volt or 

less as A/C 
clutch cycles

22

22

Malfunction 
indicator lamp 
(SERVICE 
ENGINE SOON 
or Check Engine 
Lamp)

Ignition switch: "OFF" 

→ "ON"

1 volt or less 

→ 

9 

− 13 volts 

(after several 
seconds have 
elapsed)

26

26

Left bank heated 
oxygen sensor 
heater (rear) 

Engine: warming up, idling

1 volt or less

Engine: Revving

B+

27

27

Right bank 
heated oxygen 
sensor heater 
(rear) 

Engine: warming up, idling

1 volt or less

Engine: Revving

B+

16

34

Evaporative 
emission purge 
solenoid

Ignition switch: "ON"

B+

Engine: warm up, 3,000 r/min

3 

− 13 volts

35

35

Evaporative 
emission 
ventilation 
solenoid

Ignition switch: "ON"

B+

Carry out the Actuator test to drive the 
solenoid valve

For approx. six 
seconds 1 volt 
or less

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-1082

44

44

Engine coolant 
temperature 
sensor

Ignition switch: 
"ON"

When engine coolant 
temperature is 

−20°C 

(

−4°F)

3.9 

− 4.5 volts

When engine coolant 
temperature is 0

°C (32°F)

3.2 

− 3.8 volts

When engine coolant 
temperature is 20

°C (68°F)

2.3 

− 2.9 volts

When engine coolant 
temperature is 40

°C 

(104

°F)

1.3 

− 1.9 volts

When engine coolant 
temperature is 60

°C 

(140

°F)

0.7 

− 1.3 volts

When engine coolant 
temperature is 80

°C 

(176

°F)

0.3 

− 0.9 volt

43

45

Crankshaft 
position sensor

Engine: cranking

0.4 

− 4.0 volts

Engine: idling

1.5 

− 2.5 volts

42

46

Sensor supplied 
voltage

Ignition switch: "ON"

4.5 

− 5.5 volts

47

41

Power supply

Ignition switch: "ON"

B+

59

47

57

49

MFI relay (power 
supply)

Ignition switch: "OFF"

B+

Ignition switch: "ON"

1 volt or less

96

51

Fuel tank 
temperature 
sensor

Ignition switch: 
"ON"

When fuel tank 
temperature is 0

°C (32°F)

2.7 

− 3.1 volts

When fuel tank 
temperature is 20

°C (68°F)

2.1 

− 2.5 volts

When fuel tank 
temperature is 40

°C 

(104

°F)

1.6 

− 2.0 volts

When fuel tank 
temperature is 80

°C 

(176

°F)

0.8 

− 1.2 volts

54

52

Power steering 
pressure switch

Engine: warming 
up, idling

When steering wheel is 
stationary

B+

When steering wheel is 
turned

1 volt or less

32

53

Intake manifold 
tuning solenoid

Engine: iding

1 volt or less

Engine: 5,000 r/min

B+

TERMINAL 
NO. <M/T>

TERMINAL 
NO. <A/T>

INSPECTION ITEM INSPECTION CONDITION (ENGINE 

CONDITION)

NORMAL 
CONDITION