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