Mitsubishi Galant 9G. Manual — part 1213

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1152

ACTUATOR TEST REFERENCE TABLE

M1131152500570

NOTE: *: Continues for 27 minutes. Can be released
by pressing the CLEAR key.

VAF/MAF
SNSR.

12*

5

Mass airflow
sensor*

1

• Engine

coolant
temperature
: 80

− 95°C

(176

−

203

°F)

• Lights,

electric
cooling fan
and all
accessories
: "OFF"*

6

• Transmission

: "P" range

Engine is idling 2.0

− 6.0

gm/s

−

−

2,500 r/min

8.0

− 16.0

gm/s

Engine is
revved

Mass airflow
rate
increases in
response to
revving

VSS

24*

5

Vehicle speed
signal

Drive at 40 km/h (25 mph).

Approximate
ly 40 km/h
(25 mph)

−

−

MUT-III
SCAN TOOL
DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL
CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

MUT-III
SCAN
TOOL
DISPLAY

ITEM
NO.

INSPECTION
ITEM

DRIVE
CONTENTS

INSPECTION REQUIREMENT

NORMAL
CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

BASIC
TIMING

17*

Basic
ignition
timing

Set to ignition
timing
adjustment
mode

• Engine: idling

• Connect timing light

5

°BTDC

−

−

EVAP
PURG
SOL

08

Evaporativ
e emission
purge
solenoid

Solenoid
valve turns
from OFF to
ON.

Ignition switch: "ON"

Clicks when
solenoid
valve is
driven.

Code No.
P0443

P.13B-68
8

EVAP
VENT
SOL

29

Evaporativ
e emission
ventilation
solenoid

Solenoid
valve turns
from OFF to
ON.

Ignition switch: "ON"

Clicks when
solenoid
valve is
driven.

Code No.
P0446

P.13B-70
0

FUEL
PUMP

07

Fuel pump Fuel pump

operates and
fuel is
recirculated

Ignition
switch:
"ON"

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

Sound of
operation is
heard

Procedure
No. 29

P.13B-11
07

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1153

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

M1131153600484

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: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting switch is in "OFF"
position but is no problem for checks.

NO. 1
INJECTOR

01

Injectors

Cut fuel to
No. 1 injector

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

Idling
becomes
unstable

Code No.
P0201

P.13B-48
1

NO. 2
INJECTOR

02

Cut fuel to
No. 2 injector

Code No.
P0202

P.13B-49
3

NO. 3
INJECTOR

03

Cut fuel to
No. 3 injector

Code No.
P0203

P.13B-50
4

NO. 4
INJECTOR

04

Cut fuel to
No. 4 injector

Code No.
P0204

P.13B-52
7

NO. 5
INJECTOR

05

Cut fuel to
No. 5 injector

Code No.
P0205

P.13B-51
6

NO. 6
INJECTOR

06

Cut fuel to
No. 6 injector

Code No.
P0206

P.13B-53
9

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.13B-10
93

RADIAT.
FAN LO

21

Radiator fan
and A/C
condenser
fan rotate

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.13B-88
7

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) <3.8L ENGINE>

13B-1154

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 more

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

30

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

Ignition switch: "ON"

4.9

− 5.1 V

33

Brake lamp switch Depress the brake pedal

B+

Release the brake pedal

1 V or less

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1155

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

Left bank heated
oxygen sensor
(front)

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

0

⇔ 0.8 V

(changes
repeatedly)

92

Right bank heated
oxygen sensor
(front)

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

0

⇔ 0.8 V

(changes
repeatedly)

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

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION