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