Mitsubishi Montero (2004+). Manual - part 370

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-967

FUEL 
PUMP

07

Fuel pump Fuel pump 

operates and 
fuel is 
recirculated

Ignition 
switch: 
"ON"

Pinch the 
return hose 
with fingers 
to feel the 
pulse of the 
fuel being 
recirculated

Pulse is felt

Proce-
dure No. 
29

P.13A-918

Listen near 
the fuel tank 
for the 
sound of 
fuel pump 
operation

Sound of 
operation is 
heard

VIC 
SOLEN
OID

11

Intake 
manifold 
tuning 
solenoid

Solenoid valve 
turns from 
OFF to ON.

Ignition switch: "ON"

Clicks when 
solenoid valve 
is driven

Code No. 
P0660

P.13A-698

NO. 1 
INJECT
OR

01

Injectors

Cut fuel to No. 
1 injector

Engine: warm, idle (cut 
the fuel supply to each 
injector in turn and check 
cylinders which don't 
affect idling.)

Idling 
condition 
becomes 
different 
(becomes 
unstable)

Code No. 
P0201, 
P0202, 
P0203, 
P0204, 
P0205, 
P0206

P.13A-421

NO. 2 
INJECT
OR

02

Cut fuel to No. 
2 injector

NO. 3 
INJECT
OR

03

Cut fuel to No. 
3 injector

NO. 4 
INJECT
OR

04

Cut fuel to No. 
4 injector

NO. 5 
INJECT
OR

05

Cut fuel to No. 
5 injector

NO. 6 
INJECT
OR

06

Cut fuel to No. 
6 injector

RADIAT. 
FAN LO

21

A/C 
condenser 
fan

Drive the fan 
motor

Ignition switch: "ON"

A/C condenser 
fan rotate

Procedure 
No. 27

P.13A-906

MUT-III 
SCAN 
TOOL 
DIS-
PLAY

ITEM 
NO.

INSPEC-
TION ITEM

DRIVE 
CONTENTS

INSPECTION 
REQUIREMENT

NORMAL 
CONDITION

INSPEC-
TION 
PROCEDU
RE NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-968

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

M1131153600291

TERMINAL VOLTAGE CHECK CHART

AK201354

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

31

35363738394041 42 43
444546474849

50 51

5253

545556

57 58

32

33 34 61

656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364 9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

121122

123 124

125126127128129 130 131 132 133

134135

136137 138 139 140 141

142143

144

145 146

PCM Connector Terminal Arrangement

AB

TERMINAL NO. INSPECTION 

ITEM

INSPECTION CONDITION (ENGINE 
CONDITION)

NORMAL 
CONDITION

1

No. 1 injector

• Engine: warming up, idling

• Suddenly depress the accelerator pedal

From 11 

− 14 V 

momentarily 
drops slightly

5

No. 2 injector

14

No. 3 injector

21

No. 4 injector

2

No. 5 injector

6

No. 6 injector

3

EGR  valve 
(Stepper motor coil 
<A1>)

Ignition switch: "OFF" 

→  "ON"

5 

− 8 V (changes 

about three 
seconds 
repeatedly)

12

EGR valve 
(Stepper motor coil 
<A2>)

19

EGR valve 
(Stepper motor coil 
<B1>)

26

EGR valve 
(Stepper motor coil 
<B2>)

4

Intake manifold 
tuning solenoid

Engine: idling

1 V or less

Engine: 4,500 r/min

B+

7

Malfunction 
indicator lamp 
(SERVICE 
ENGINE SOON or 
check engine 
lamp)

Ignition switch: "OFF" 

→ "ON"

1 V or less 

→ 9 − 

13 V (after 
several seconds 
have elapsed)

8

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

10

Left bank heated 
oxygen sensor 
heater (front)

Engine: warming up, idling (15 seconds after 
starting engine)

9 

− 11 V

Engine: Revving

9 

− 11 V → B+ 

(momentarily)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-969

11

Evaporative 
emission 
ventilation solenoid

Ignition switch: "ON"

B+

Carry out the actuator test to drive the solenoid 
valve.

For 
approximately 
Six seconds 1 V 
or less

15

Throttle actuator 
control motor relay

Ignition switch: "OFF"

B+

Ignition switch: "ON"

1 V or less

16

Fuel pump relay

Ignition switch: "ON"

B+

Engine: idling

1 V or less

17

Condenser fan 
relay

Condenser fan is not operating

B+

Condenser fan is running operating

1 V or less

18

Left bank heated 
oxygen sensor 
heater (rear) 

Engine: warming up, idling

1 V or less

Engine: Revving

B+

23

Evaporative 
emission purge 
solenoid

Ignition switch: "ON"

B+

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

Approximately 9 
V

24

Right bank heated 
oxygen sensor 
heater (rear)

Engine: warming up, idling

1 V or less

Engine: Revving

B+

25

Right bank heated 
oxygen sensor 
heater (front)

Engine: warming up, idling (15 seconds after 
starting engine)

9 

− 11 V

Engine: Revving

9 

− 11 V → B+ 

(momentarily)

31

Ignition coil 

− No. 

1, No. 4 (ignition 
power transistor)

Engine: 3,000 r/min

0.3 

− 3.0 V

35

Ignition coil 

− No. 

2, No. 5 (ignition 
power transistor)

44

Ignition coil 

− No. 

3, No. 6 (ignition 
power transistor)

34

Power supply

Ignition switch: "ON"

B+

43
34

Volume airflow 
sensor reset signal

Engine: idling

1 V or less

Engine: 3,000 r/min

6 

− 9 V

38

Accelerator pedal 
position switch

Ignition switch: 
"ON" 

closed throttle

0 

− 1 V

Open throttle slightly

4 V or more

47

Power steering 
pressure switch

Engine: warming 
up, idling

When steering wheel is 
stationary

B+

When steering wheel is 
turned

1 V or less

50

Ignition switch-IG

Ignition switch: "ON" 

B+

TERMINAL NO. INSPECTION 

ITEM

INSPECTION CONDITION (ENGINE 
CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-970

51

Ignition switch-ST

Engine: cranking

8 V or more

57

MFI relay (power 
supply)

Ignition switch: "OFF"

B+

Ignition switch: "ON"

1 V or less

58

Backup power 
supply

Ignition switch: "OFF"

B+

63

Volume airflow 
sensor

Engine: idling

2.2 

− 3.2 V

Engine: 2,500 r/min

69

A/C switch

Engine: idling

Turn the A/C switch OFF

1 V or less 

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

B+

70

Crankshaft 
position sensor

Engine: cranking

0.4 

− 4.0 V

Engine: idling

1.5 

− 2.5 V

71

Camshaft position 
sensor

Engine: cranking

0.4 

− 3.0 V

Engine: idling

0.5 

− 2.0 V

78

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)

B+

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

0 

− 3 V

79

Vehicle speed 
sensor

• Ignition switch: "ON" 

• Move the vehicle slowly forward

0 

⇔ 8 − 12 V 

(changes 
repeatedly)

81

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

82

Fuel tank 
differential 
pressure sensor

Engine: idling

1.2 

− 3.8 V

87

Tachometer signal Engine: 3,000 r/min

0.3 

− 3.0 V

92

Power supply 
voltage applied to 
accelerator pedal 
position sensor 
(main)

Ignition switch: ON

4.5 

− 5.5 V

97

Sensor supplied 
voltage

Ignition switch: "ON"

4.5 

− 5.5 V

TERMINAL NO. INSPECTION 

ITEM

INSPECTION CONDITION (ENGINE 
CONDITION)

NORMAL 
CONDITION