Mitsubishi Galant (2004+). Manual — part 1353

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1105

TP
SENSOR

8A*

4

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

− 5 %

Code No.
P0122,
P0123

P.13B-1
56

,

P.13B-1
66

Fully open the
throttle valve
with your finger

88 % or more

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).

Approximately
40 km/h (25
mph)

−

−

MUT-III SCAN
TOOL DISPLAY

ITEM NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION
PROCEDURE NO.

REFERENCE
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1106

ACTUATOR TEST REFERENCE TABLE

M1131152500570

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

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

Evaporati
ve
emission
purge
solenoid

Solenoid
valve turns
from OFF to
ON.

Ignition switch: "ON"

Clicks when
solenoid
valve is
driven.

Code No.
P0443

P.13B-
665

EVAP
VENT
SOL

29

Evaporati
ve
emission
ventilatio
n
solenoid

Solenoid
valve turns
from OFF to
ON.

Ignition switch: "ON"

Clicks when
solenoid
valve is
driven.

Code No.
P0446

P.13B-
677

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

Procedur
e No. 29

P.13B-
1061

NO. 1
INJECT
OR

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-
471

NO. 2
INJECT
OR

02

Cut fuel to
No. 2 injector

Code No.
P0202

P.13B-
482

NO. 3
INJECT
OR

03

Cut fuel to
No. 3 injector

Code No.
P0203

P.13B-
492

NO. 4
INJECT
OR

04

Cut fuel to
No. 4 injector

Code No.
P0204

P.13B-
513

NO. 5
INJECT
OR

05

Cut fuel to
No. 5 injector

Code No.
P0205

P.13B-
503

NO. 6
INJECT
OR

06

Cut fuel to
No. 6 injector

Code No.
P0206

P.13B-
524

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1107

RADIAT.
FAN HI

20

Radiator
fan, A/C
condense
r fan

Drive the fan
motor

Ignition switch: "ON"

Radiator fan
and
condenser
fan rotate at
high speed.

Procedur
e No. 27

P.13B-
1046

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-
825

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-1108

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

M1131153600309

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: 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.

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