Mitsubishi Montero Sport (2004+). Manual — part 361

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-857

14

Stepper motor coil
<A1>

NOTE: 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.

• Engine: warming up, idling

• A/C switch: OFF → ON

• Headlight switch: OFF → ON

B+

⇔ 1 volt or

less (changes
repeatedly)

28

Stepper motor coil
<A2>

15

Stepper motor coil
<B1>

29

Stepper motor coil
<B2>

18

Condenser fan
relay

Condenser fan is not operating

Battery positive
voltage

Condenser fan is operating

1 volt or less

19

Volume airflow
sensor reset signal

Engine: idling

1 volt or less

Engine: 3,000 r/min

6

− 9 volts

20

A/C compressor
clutch relay

• Engine: idling

• A/C switch: OFF→ ON (A/C compressor is

operating)

B+

→ 1 volt or

less as A/C
clutch cycles

21

Fuel pump relay

Ignition switch: "ON"

B+

Engine: idling

1 volt or less

22

Malfunction
Indicator Lamp
(SERVICE
ENGINE SOON or
Check Engine
Lamp)

Ignition switch: "OFF"

→ "ON"

1 volt or less

→

9

− 13 volts

(after several
seconds have
elapsed)

26

Left bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

1 volt or less

Engine: Revving

B+

27

Right bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

1 volt or less

Engine: Revving

B+

34

Evaporative
emission purge
solenoid

Ignition switch: "ON"

B+

Engine: warm, 3,000 r/min (duty cycle)

1 volt or less

35

Evaporative
emission
ventilation solenoid

Ignition switch: "ON"

B+

Carry out the actuator test to drive the solenoid
valve.

For
approximately
Six seconds 1
volt or less

41

Power supply

Ignition switch: "ON"

B+

47
43

Spark check signal Engine: 3,000 r/min

0.3

− 3.0 volts

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-858

44

Engine coolant
temperature
sensor

Ignition switch:
"ON"

When engine coolant
temperature is -20

° C (-4° F)

3.9

− 4.5 volts

When engine coolant
temperature is 0

° C (32° F)

3.2

− 3.8 volts

When engine coolant
temperature is 20

° C (68° F)

2.3

− 2.9 volts

When engine coolant
temperature is 40

° C (104°

F)

1.3

− 1.9 volts

When engine coolant
temperature is 60

° C (140°

F)

0.8

− 1.4 volts

When engine coolant
temperature is 80

° C (176°

F)

0.3

− 0.9 volt

45

Crankshaft
position sensor

Engine: cranking

0.4

− 4.0 volts

Engine: idling

1.5

− 2.5 volts

46

Sensor supplied
voltage

Ignition switch: "ON"

4.5

− 5.5 volts

49

MFI relay (power
supply)

Ignition switch: "OFF"

B+

Ignition switch: "ON"

1 volt or less

51

Fuel tank
temperature
sensor

Ignition switch:
"ON"

When fuel tank temperature
is 0

° C (32° F)

2.7

− 3.1 volts

When fuel tank temperature
is 20

° C (68° F)

2.1

− 2.5 volts

When fuel tank temperature
is 40

° C (104° F)

1.6

− 2.0 volts

When fuel tank temperature
is 80

° C (176° F)

0.8

− 1.2 volts

52

Power steering
pressure switch

Engine: warming
up, idling

When steering wheel is
stationary

B+

When steering wheel is
turned

1 volt or less

55

Barometric
pressure sensor

Ignition switch:
"ON"

When altitude is 0 m (0 ft)

3.7

− 4.3 volts

When altitude is 600 m
(1,969 ft)

3.4

− 4.0 volts

When altitude is 1,200 m
(3,937 ft)

3.2

− 3.8 volts

When altitude is 1,800 m
(5,906 ft)

2.9

− 3.5 volts

56

Camshaft position
sensor

Engine: cranking

0.4

− 3.0 volts

Engine: idling

0.5

− 2.0 volts

58

Ignition switch-ST

Engine: cranking

8 volts or more

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-859

60

Fuel level sensor

Ignition switch:
"ON"

When fuel gauge is near
"FULL"

0.1

− 3.6 volts

When fuel gauge is near
"EMPTY"

2.7

− 6.2 volts

61

A/C switch 2

Engine: idling
Outside air
temperature: 25

° C

or more

when A/C is MAX. COOL
condition (when the load by
A/C is high)

Battery positive
voltage

when A/C is MAX. HOT
condition (when the load by
A/C is low)

1 volt or less

64

Intake air
temperature
sensor

Ignition switch:
"ON"

When Intake air temperature
is -20

° C (-4° F)

3.8

− 4.4 volts

When Intake air temperature
is 0

° C (32° F)

3.2

− 3.8 volts

When Intake air temperature
is 20

° C (68° F)

2.3

− 2.9 volts

When Intake air temperature
is 40

° C (104° F)

1.5

− 2.1 volts

When Intake air temperature
is 60

° C (140° F)

0.8

− 1.4 volts

When Intake air temperature
is 80

° C (176° F)

0.4

− 1.0 volt

65

Volume airflow
sensor

Engine: idling

2.2

− 3.2 volts

Engine: 2,500 r/min

66

Backup power
supply

Ignition switch: "OFF"

B+

71

Left bank heated
oxygen sensor
(front)

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

0

⇔ 0.8 volt

(changes
repeatedly)

72

Right bank heated
oxygen sensor
(front)

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

0

⇔ 0.8 volt

(changes
repeatedly)

73

Left bank heated
oxygen sensor
(rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0

volt alternates

74

Right bank heated
oxygen sensor
(rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0

volt alternates

78

Throttle position
sensor

Ignition switch:
"ON" (check for
smooth voltage
increase as throttle
is moved from idle
position to wide
open throttle)

Closed throttle

0.535

− 0.735

volt

Wide open throttle

4.5

− 5.5 volts

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-860

83

A/C switch

Engine: idling

Turn the A/C switch OFF

1volt or less

Turn the A/C switch ON (A/C
compressor is operating)

B+

91

Manifold absolute
pressure sensor

Igition switch: ON

When altitude is 0 m (0 ft.)

3.8 - 4.2 volts

When altitude is 600 m
(1,969 ft.)

3.5 - 3.9 volts

When altitude is 1,200 m
(3,937 ft.)

3.3 - 3.7 volts

When altitude is 1,800 m
(5,906 ft.)

3.0 - 3.4 volts

Engine: idling

0.9

− 1.5 volts

While engine is idling after having warmed up,
suddenly depress the accelerator pedal

Varies

92

Fuel tank
differential
pressure sensor

Engine: idling

1.2

− 3.8 volts

96

Fuel level warning
light

Ignition switch: "OFF"

→ "ON" (When fuel gauge

is not near "EMPTY")

1 volt or less

→

9

− 13 volts

(after several
seconds have
elapsed)

98

Ignition switch-IG

Ignition switch: "ON"

B+

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION