Mitsubishi Galant 9G. Manual — part 914

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1098

RADIAT.
FAN HI

20

Radiator
fan, A/C
condenser
fan

Drive the fan
motor

Ignition switch: "ON"

Radiator
fan and
condenser
fan rotate
at high
speed.

Procedure
No. 27

P.13A-10
40

RADIAT.
FAN LO

21

Radiator
fan and
condenser
fan rotate
at low
speed.

TCA
FAIL
SAFE

34

Throttle
actuator
control
system

Stop the
throttle
actuator
control motor

Ignition switch: "ON"

Throttle
valve is
opened
slightly

Code No.
P0638

P.13A-82
3

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) <2.4L ENGINE>

13A-1099

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

M1131153600473

1. Disconnect the PCM connectors B-19, B-20,

B-21, B-22 and B-23, and connect check harness
special tool MB991923 between the PCM
connectors.

2. Measure the voltage between each check

harness connector terminal and check harness
connector ground terminal (No. 25 or No. 29).

TERMINAL VOLTAGE CHECK CHART
NOTE: *

1

: The average voltage through an analog voltmeter is described in this service manual (because the

average voltage is too stable to be shown on a digital voltmeter).
NOTE: *

2

: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting switch is in "OFF"

position but this is no problem for checks.

AK203309

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

Check Harness Special Tool MB991923 Connector Terminal Arrangement

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

2

Evaporative
emission
ventilation solenoid

Ignition switch: "ON"

B+

Carry out the actuator test to drive the solenoid
valve.

For
approximately 6
seconds 1 V or
less

5

Fan control relay
(high)

Ignition switch: "ON"

B+

Carry out the actuator test to revolve the fan at
high speed.

1 V or less

6

Fuel pump relay

Ignition switch: "ON"

B+

Engine: idling

1 V or less

10

Fan control relay
(low)

Ignition switch: "ON"

B+

Carry out the actuator test to revolve the fan at
low speed.

1 V or less

21

Sensor supplied
voltage

Ignition switch: "ON"

4.9

− 5.1 V

68
23

Fuel tank
differential
pressure sensor

Engine: idling

1.2

− 3.8 V

26

Accelerator pedal
position sensor
(main)

Ignition switch:
"ON"

Release the accelerator
pedal

0.735

− 1.335 V

Depress the accelerator
pedal fully

4.0 V or more

27

Accelerator pedal
position sensor
(sub)

Ignition switch:
"ON"

Release the accelerator
pedal

0.435

− 1.035 V

Depress the accelerator
pedal fully

3.7 V or more

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1100

30

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

Ignition switch: "ON"

4.9

− 5.1 V

41

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

42

Backup power
supply

Ignition switch: "LOCK" (OFF)

B+

43

Ignition switch-IG

Ignition switch: "ON"

B+

51

Power supply

Ignition switch: "ON"

B+

64
52

MFI relay (power
supply)

Ignition switch: "LOCK" (OFF)

B+

Ignition switch: "ON"

1 V or less

78

Power steering
pressure switch

Engine: warming
up, idling

When steering wheel is not
turned

B+

When steering wheel is
turned

1V or less

81

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

83

Ignition switch-ST

Engine: cranking

8 V or more

91

Cylinder 2, 3
heated oxygen
sensor (front)

Engine: warming up, 2,500 r/min

0

⇔ 0.8 V

(changes
repeatedly)

92

Cylinder 1, 4
heated oxygen
sensor (front)

Engine: warming up, 2,500 r/min

0

⇔ 0.8 V

(changes
repeatedly)

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-1101

93

Engine coolant
temperature
sensor

Ignition switch:
"ON"

When engine coolant
temperature is

−20°C (−4°F)

3.9

− 4.5 V

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 60

°C (140°F)

0.7

− 1.3 V

When engine coolant
temperature is 80

°C (176°F)

0.3

− 0.9 V

94

Power supply
voltage applied to
throttle position
sensor

Ignition switch: "ON"

4.9

− 5.1 V

96

Cylinder 2, 3
heated oxygen
sensor (rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0 V

alternates

97

Cylinder 1, 4
heated oxygen
sensor (rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0 V

alternates

98

Throttle position
sensor (sub)

• 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

2.2

− 2.8 V

Fully open the throttle valve
with your finger

4.0 V or more

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION