Mitsubishi Galant 9G. Manual — part 915

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1102

99

Throttle position
sensor (main)

• Remove the

intake air hose
at the throttle
body

• Disconnect the

throttle position
sensor
connector, and
then connect
terminal
numbers No. 3,
No. 4, No. 5 and
No. 6 with the
use of the
special tool:
MB991658.

• Ignition switch:

"ON"

Fully close the throttle valve
with your finger

0.3

− 0.7 V

Fully open the throttle valve
with your finger

4.0 V or more

102

Manifold absolute
pressure sensor

Ignition switch:
"ON"

At altitude of 0 m (0 ft.)

3.8

− 4.2 V

At altitude of 600 m (1,969
ft.)

3.5

− 3.9 V

At altitude of 1,200 m (3,937
ft.)

3.3

− 3.7 V

At altitude of 1,800 m (5,906
ft.)

3.0

− 3.4 V

Engine: warming up, idling

0.6

− 1.4 V

When engine is suddenly revved.

Voltage varies

103

Crankshaft
position sensor

Engine: cranking

0.4

− 4.0 V*

1

Engine: idling

2.0

− 3.0 V*

1

104

Camshaft position
sensor

Engine: cranking

2.0

− 4.8 V*

1

Engine: idling

3.0

− 4.0 V*

1

107

Intake air
temperature
sensor

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

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1103

108

Mass airflow
sensor

Engine: revving

Voltage increase
in response to
revving

110

Engine oil pressure
switch

Ignition switch: "ON"

1 V or less

Engine: warming up, 4,000 r/min

B+

122

Power supply
voltage applied to
throttle actuator
control motor

Ignition switch: "ON"

B+

123

Throttle actuator
control motor relay

Ignition switch: "ON"

→ "LOCK" (OFF)

1 V or less

→ B+

→ 1 V or less

125

Cylinder 2, 3
heated oxygen
sensor heater
(front)

Engine: warming up, idling (15 seconds after
starting engine)

9

− 11 V*

1

Engine: revving

9

− 11 V*

1

→ B+

(momentarily)

126

Cylinder 1, 4
heated oxygen
sensor heater
(front)

Engine: warming up, idling (15 seconds after
starting engine)

9

− 11 V*

1

Engine: revving

9

− 11 V*

1

→ B+

(momentarily)

128

Engine oil control
valve

Ignition switch: "ON"

B+

Engine: warming up, 4,000 r/min

4.0

− 10 V*

1

131

Generator FR
terminal

• Engine: warming up, idling (radiator fan:

stopped)

• Headlight: OFF to ON*

2

• Rear defogger switch: OFF to ON

• Stop light switch: OFF to ON

Voltage drops

132

Generator G
terminal

• Engine: warming up, idling (radiator fan:

stopped)

• Headlight: OFF to ON*

2

• Rear defogger switch: OFF to ON

• Stop light switch: OFF to ON

Voltage rises

137

Cylinder 2, 3
heated oxygen
sensor heater
(rear)

Engine: warming up, idling

1 V or less

Engine: revving

B+

138

Cylinder 1, 4
heated oxygen
sensor heater
(rear)

Engine: warming up, idling

1 V or less

Engine: revving

B+

141

Throttle actuator
control motor (

−)

• Ignition switch: "ON"

• Accelerator pedal: fully closed → fully opened

Decreases
slightly
(approximately 2
V) from battery
voltage.

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1104

147

Throttle actuator
control motor (+)

• Ignition switch: "ON"

• Accelerator pedal: fully opened → fully closed

Decreases
slightly
(approximately 2
V) from battery
voltage.

142

EGR valve
(Stepper motor coil
<A1>)

Ignition switch: "LOCK" (OFF)

→ "ON"

5

− 8 V*

1

(changes about
three seconds
repeatedly)

136

EGR valve
(Stepper motor coil
<A2>)

130

EGR valve
(Stepper motor coil
<B1>)

124

EGR valve
(Stepper motor coil
<B2>)

149

Evaporative
emission purge
solenoid

Ignition switch: "ON"

B+

Engine: warm up, 3,000 r/min (within 3 minutes
after the engine starting sequence is completed)

Voltage drops

151

Ignition coil

− No. 1

(ignition power
transistor)

Engine: 3,000 r/min

0.3

− 3.0 V*

1

143

Ignition coil

− No. 2

(ignition power
transistor)

150

Ignition coil

− No. 3

(ignition power
transistor)

148

Ignition coil

− No. 4

(ignition power
transistor)

153

No. 1 injector

• Engine: warming up, idling

• Suddenly depress the accelerator pedal

From 9

− 13 V*

1

momentarily
drops slightly

146

No. 2 injector

140

No. 3 injector

139

No. 4 injector

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1105

TERMINAL RESISTANCE AND CONTINUITY CHECK

AK203310

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AB

PCM Harness Side Connector Terminal Arrangement

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

25

− Body

ground

PCM ground

Continuity (2

Ω or less)

29

− Body

ground

PCM ground

34

− Body

ground

PCM ground

38

− Body

ground

PCM ground

2

− 51

Evaporative emission ventilation solenoid

17

− 21 Ω [at 20°C (68°F)]

69

− 93

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)]

69

− 107

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

− 0.45 kΩ [when intake air temperature is

80

°C (176°F)]

51

− 125

Cylinder 2, 3 heated oxygen sensor heater
(front)

4.5

− 8.0 Ω [at 20°C (68°F)]