Mitsubishi Galant. Manual — part 319

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-501

TERMINAL NO.

INSPECTION
ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

1

No.1 injector

•

Engine: warming up, idling

•

Suddenly depress the accelerator pedal

From 11

−

14 V

momentarily
drops slightly

9

No.2 injector

24

No.3 injector

2

No.4 injector

10

No.5 injector

25

No.6 injector

3

Left bank heated
oxygen sensor
heater (front)

Engine: warming up, idling

9

−

11 V

Engine: Revving

9

−

11 V

→

B+

(momentarily)

4

Right bank heated
oxygen sensor
heater (front)

Engine: warming up, idling

9

−

11 V

Engine: Revving

B+

6

EGR solenoid

Ignition switch: "ON"

B+

•

Engine: idling

•

Suddenly depress the accelerator pedal.

From B+ , drops
momentarily

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 V

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

Ignition power
transistor

Engine: 3,000 r/min

0.3

−

3.0 V

14

Stepper motor coil
<A1>

•

Engine: warming up, idling

•

A/C switch: OFF

→

ON

•

Headlight switch: OFF

→

ON

B+

⇔

1 V or less

(changes
repeatedly)

28

Stepper motor coil
<A2>

15

Stepper motor coil
<B1>

29

Stepper motor coil
<B2>

18

Fan controller

Radiator fan and A/C condenser fan are not
operating

0

−

0.3V

Radiator fan and A/C condenser fan are
operating

0.7 V or more

19

Volume air flow
sensor reset signal

Engine: idling

0

−

1 V

Engine: 3,000 r/min

6

−

9 V

21

Fuel pump relay

Ignition switch: "ON"

B+

Engine: idling

0

−

3V

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-502

20

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

22

Service engine
soon/malfunction
indicator lamp

Ignition switch: "OFF"

→

"ON"

1 V or less

→

9

−

13 V (after
several seconds
have elapsed)

26

Left bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

1 V or less

Engine: Revving

B+

27

Right bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

1 V or less

Engine: Revving

B+

34

Evaporative
emission purge
solenoid

Ignition switch: "ON"

B+

Engine: warm up, 3,000 r/min

3

−

13 V

35

Evaporative
emission
ventilation solenoid

Ignition switch: "ON"

B+

Carry out the Actuator test to drive the solenoid
valve

For approx. six
seconds 1 V or
less

41

Power supply

Ignition switch: "ON"

B+

43

Spark check signal Engine: 3,000 r/min

8

−

12 V

44

Engine coolant
temperature
sensor

Ignition switch:
"ON"

When engine coolant
temperature is 0

°

C (32

°

F)

3.2

−

3.8 V

When engine coolant
temperature is 20

°

C (68

°

F)

2.3

−

2.9 V

When engine coolant
temperature is 40

°

C (104

°

F)

1.3

−

1.9 V

When engine coolant
temperature is 80

°

C (176

°

F)

0.3

−

0.9 V

45

Crankshaft
position sensor

Engine: cranking

0.4

−

4.0 V

Engine: idling

1.5

−

2.5 V

46

Sensor supplied
voltage

Ignition switch: "ON"

4.5

−

5.5 V

41

Power supply

Ignition switch: "ON"

B+

47

49

MFI relay (power
supply)

Ignition switch: "OFF"

B+

Ignition switch: "ON"

1V or less

52

Power steering
pressure switch

Engine: warming
up, idling

When steering wheel is
stationary

B+

When steering wheel is
turned

1V or less

TERMINAL NO.

INSPECTION
ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-503

55

Barometric
pressure sensor

Ignition switch:
"ON"

When altitude is 0 m (0 ft)

3.7

−

4.3 V

When altitude is 600 m
(1,969 ft)

3.4

−

4.0 V

When altitude is 1,200 m
(3,937 ft)

3.2

−

3.8 V

When altitude is 1,800 m
(5,906 ft)

2.9

−

3.5 V

56

Camshaft position
sensor

Engine: cranking

0.4

−

3.0 V

Engine: idling

0.5

−

2.0 V

58

Ignition switch-ST

Engine: cranking

8 V or more

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 V or less

64

Intake air
temperature
sensor

Ignition switch:
"ON"

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 80

°

C (176

°

F)

0.4

−

1.0 V

65

Volume air flow
sensor

Engine: idling

2.2

−

3.2 V

Engine: 2,500 r/min

66

Backup power
supply

Ignition switch: "OFF"

B+

71

Left bank heated
oxygen sensor
(front)

•

Engine: warming up, 2,500 r/min (check using
a digital voltmeter)

0

⇔

0.8 V

(changes
repeatedly)

72

Right bank heated
oxygen sensor
(front)

•

Engine: warming up, 2,500 r/min (check using
a digital voltmeter)

0

⇔

0.8 V

(changes
repeatedly)

73

Left bank heated
oxygen sensor
(rear)

•

Engine: warming up

•

Revving

0 and 0.6

−

1.0 V

alternates

74

Right bank heated
oxygen sensor
(rear)

•

Engine: warming up

•

Revving

0 and 0.6

−

1.0 V

alternates

TERMINAL NO.

INSPECTION
ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-504

TERMINAL RESISTANCE AND CONTINUITY CHECK

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 V

Wide open throttle

4.5

−

5.5 V

79

Idle position signal Ignition switch:

"ON"

Set throttle valve to idle
position

0

−

1 V

Open throttle slightly

4 V or more

80

Vehicle speed
sensor

•

Ignition switch: "ON"

•

Move the vehicle slowly forward

0

⇔

8 -12 V

(changes
repeatedly)

83

A/C switch

Engine: idling

Turn the A/C switch OFF

1V or less

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

B+

91

Manifold
differential
pressure sensor

Engine: idling

0.8

−

2.4 V

•

Engine: idling

•

Suddenly depress the accelerator pedal

Rises from 0.8

−

2.4 V suddenly

92

Fuel tank
differential
pressure sensor

Engine: idling

1.2

−

3.8 V

98

Ignition switch-IG

Ignition switch: "ON"

B+

TERMINAL NO.

INSPECTION
ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

AKX01369

71

78

90

46

57

66

45

56

65

1

9

24

107

120

130

2

10

25

106

119

129

11

105

118

3

12

26

117

128

4

13

27

116

127

14

28

115

126

15

29

114

16

113

125

17

30

104

112

124

18

31

103

111

5

19

32

110

123

6

20

33

102

109

122

21

101

108

121

7

22

34

77

89

98

8

23

35

76

88

97

41

47

58

75

87

42

48

59

86

96

43

49

85

95

50

60

84

51

61

83

94

52

62

82

93

53

63

74

81

92

73

80

54

72

79

91

44

55

64

PCM Harness Side Connector Terminal Arrangement

AB

TERMINAL NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION CONDI-
TION)

1

−

41

No.1 injector

13

−

16

Ω

[at 20

°

C (68

°

F)]

9

−

41

No.2 injector

24

−

41

No.3 injector

2

−

41

No.4 injector

10

−

41

No.5 injector

25

−

41

No.6 injector

3

−

41

Left bank heated oxygen sensor heater
(front)

4.5

−

8.0

Ω

[at 20

°

C (68

°

F)]