Mitsubishi Montero (2002-2004). Manual — part 572

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-45

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

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-46

98

Engine coolant
temperature
sensor

Ignition switch:
"ON"

When engine coolant
temperature is -20

°C (-4°F)

3.9

− 4.5 V

When engine coolant
temperature is 0

°C (32°F)

3.2

− 3.8 V

When engine coolant
temperature is 20

°C (68°F)

2.3

− 2.9 V

When engine coolant
temperature is 40

°C (104°F)

1.3

− 1.9 V

When engine coolant
temperature is 60

°C (140°F)

0.7

− 1.3 V

When engine coolant
temperature is 80

°C (176°F)

0.3

− 0.9 V

99

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

100

Barometric
pressure sensor

Ignition switch:
"ON"

When altitude is 0 m (0 ft)

3.7

− 4.3 V

When altitude is 600 m
(1,969 ft)

3.4

− 4.0 V

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

3.2

− 3.8 V

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

2.9

− 3.5 V

101

Manifold
differential
pressure sensor

Engine: idling

0.8

− 2.4 V

• Engine: idling

• Revving (momentary wide open throttle)

Rises from 0.8

−

2.4 V suddenly

106

Power supply
voltage applied to
throttle position
sensor

Ignition switch: ON

4.5

− 5.5 V

107

Accelerator pedal
position sensor
(sub)

Ignition switch: ON Release the accelerator

pedal

0.905

− 1.165 V

Depress the accelerator
pedal fully

4.035 V or more

108

Left bank heated
oxygen sensor
(front)

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

0

⇔ 0.8 V

(changes
repeatedly)

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-47

109

Right bank heated
oxygen sensor
(front)

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

0

⇔ 0.8 V

(changes
repeatedly)

113

Throttle position
sensor (sub)

• Remove the

intake air hose
at the throttle
body

• Disconnect the

throttle position
sensor, and
then connect
terminal
numbers No. 1,
No. 2, No. 3 and
No. 4 with the
use of the
special tool:
MB991348.

• Ignition switch:

ON

Fully close the throttle valve
with your finger

2.2

− 2.8 V

Fully open the throttle valve
with your finger

3.8

− 4.9 V

114

Accelerator pedal
position sensor
(main)

Ignition switch: ON Release the accelerator

pedal

0.905

− 1.165 V

Depress the accelerator
pedal fully

4.035 V or more

115

Throttle position
sensor (main)

• Remove the

intake air hose
at the throttle
body

• Disconnect the

throttle position
sensor, and
then connect
terminal
numbers No. 1,
No. 2, No. 3 and
No. 4 with the
use of the
special tool:
MB991348.

• Ignition switch:

ON

Fully close the throttle valve
with your finger

0.2

− 0.8 V

Fully open the throttle valve
with your finger

3.8

− 4.9 V

116

Left bank heated
oxygen sensor
(rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0 V

alternates

117

Right bank heated
oxygen sensor
(rear)

• Engine: warming up

• Revving

0 and 0.6

− 1.0 V

alternates

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-48

TERMINAL RESISTANCE AND CONTINUITY CHECK

132

Power supply
voltage applied to
throttle actuator
control motor

Ignition switch: ON

B+

133

Throttle actuator
control motor (+)

• Ignition switch: ON

• Accelerator pedal: fully opened → fully closed

Decreases
slightly (approx.
2V) from battery
voltage.

141

Throttle actuator
control motor (

−)

• Ignition switch: ON

• Accelerator pedal: fully closed → fully opened

Decreases
slightly (approx.
2V) from battery
voltage.

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

AK201355

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

52

53

54

55

56

57

58

50

51

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

61

62

63

64

65

66

67

68

69

70

71

76

77

78

79

85

86

87

80

72

73

74

75

81

82

83

84

88

89

2

3

4

5

6

7

8

9

1

10

14

15

16

17

18

19

20

21

22

23

24

25

26

27

11

12

13

PCM Harness Side Connector Terminal Arrangement

AB

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

1

− 34

No. 1 injector

13

− 16 Ω [at 20°C (68°F)]

5

− 34

No. 2 injector

14

− 34

No. 3 injector

21

− 34

No. 4 injector

2

− 34

No. 5 injector

6

− 34

No. 6 injector

10

− 34

Left bank heated oxygen sensor heater
(front)

4.5

− 8.0 Ω [at 20°C (68°F)]

25

− 34

Right bank heated oxygen sensor heater
(front)

4.5

− 8.0 Ω [at 20°C (68°F)]

4

− 34

Intake manifold tuning solenoid

29

− 35 Ω [at 20°C (68°F)]

3

− 34

Stepper motor coil (A1)

20

− 24 Ω [at 20°C (68°F)]

12

− 34

Stepper motor coil (A2)

19

− 34

Stepper motor coil (B1)

26

− 34

Stepper motor coil (B2)

18

− 34

Left bank heated oxygen sensor heater
(rear)

11

− 18 Ω [at 20°C (68°F)]

24

− 34

Right bank heated oxygen sensor heater
(rear)

11

− 18 Ω [at 20°C (68°F)]