Mitsubishi Galant (2004+). Manual — part 1354

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1109

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

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)

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1110

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

Left bank heated
oxygen sensor
(rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0 V

alternates

97

Right bank 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1111

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 0 m (1,969 ft.) 3.5

− 3.9 V

AT altitude of 0 m (3,937 ft.) 3.3

− 3.7 V

AT altitude of 0 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

0.4

− 4.0 V *

1

Engine: idling

2.9

− 3.9 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

108

Mass airflow
sensor

Engine: revving

Voltage increase
in response to
revving

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1112

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

Left bank 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

Right bank 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)

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

Left bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

1 V or less

Engine: revving

B+

138

Right bank 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.
2V) from battery
voltage.

147

Throttle actuator
control motor (+)

• Ignition switch: "ON"

• Accelerator pedal: fully opened → fully closed

Decreases
slightly
(Approximately.
2V) from battery
voltage.

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION