Mitsubishi Galant 9G. Manual — part 1214

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1156

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

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

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-1157

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

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

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)

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-1158

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.

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 drop

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-1159

151

Ignition coil

− No. 1

(ignition power
transistor)

Engine: 3,000 r/min

0.3

− 3.0 V *

1

150

Ignition coil

− No. 2

(ignition power
transistor)

144

Ignition coil

− No. 3

(ignition power
transistor)

148

Ignition coil

− No. 4

(ignition power
transistor)

143

Ignition coil

− No. 5

(ignition power
transistor)

134

Ignition coil

− No. 6

(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

133

No. 5 injector

127

No. 6 injector

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION