Mitsubishi Montero Sport (2004+). Manual - part 362

 

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Mitsubishi Montero Sport (2004+). Manual - part 362

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-861

TERMINAL RESISTANCE AND CONTINUITY CHECK

AKX01369

71

78

90

46

57

66

45

56

65

1

9

24

107

120

130

2

10

25

106

119

129

11

105

118

3

12

26

117

128

4

13

27

116

127

14

28

115

126

15

29

114

16

113

125

17

30

104

112

124

18

31

103

111

5

19

32

110

123

6

20

33

102

109

122

21

101

108

121

7

22

34

77

89

98

8

23

35

76

88

97

41

47

58

75

87

42

48

59

86

96

43

49

85

95

50

60

84

51

61

83

94

52

62

82

93

53

63

74

81

92

73

80

54

72

79

91

44

55

64

PCM Harness Side Connector Terminal Arrangement

AB

TERMINAL 
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION 
CONDITION)

− 41

No.1 injector

13 

− 16 ohms [at 20° C (68° F)]

− 41

No.2 injector

24 

− 41

No.3 injector

− 41

No.4 injector

10 

− 41

No.5 injector

25 

− 41

No.6 injector

− 41

Left bank heated oxygen sensor heater 
(front) 

4.5 

− 8.0 ohms [at 20° C (68° F)]

− 41

Right bank heated oxygen sensor heater 
(front)

4.5 

− 8.0 ohms [at 20° C (68° F)]

− 41

EGR vacuum regulator solenoid valve

30 

− 34 ohms [at 20° C (68° F)]

14 

− 41

Stepper motor coil (A1)

28 

− 33 ohms [at 20° C (68° F)]

28 

− 41

Stepper motor coil (A2)

15 

− 41

Stepper motor coil (B1)

29 

− 41

Stepper motor coil (B2)

26 

− 41

Left bank heated oxygen sensor heater 
(rear) 

11 

− 18 ohms [at 20° C (68° F)]

27 

− 41

Right bank heated oxygen sensor heater 
(rear)

11 

− 18 ohms [at 20° C (68° F)]

34 

− 41

Evaporative emission purge solenoid

30 

− 34 ohms [at 20° C (68° F)]

35 

− 41

Evaporative emission ventilation solenoid

17 

− 21 ohms [at 20° C (68° F)]

42 

− Body 

ground

PCM ground

Continuity (2 ohm or less)

48 

− Body 

ground

PCM ground

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-862

NOTE: 

*:

 indicates that resistance value should be 400 ohms or less.

44 

− 57

Engine coolant temperature

14 

− 17 kΩ [when engine coolant temperature 

is -20

° C (-4° F)]

5.1 

− 6.5 kΩ [when engine coolant temperature 

is 0

° C (32° F)]

2.1 

− 2.7 kΩ [when engine coolant temperature 

is 20

° C (68° F)]

0.9 

− 1.3 kΩ [when engine coolant temperature 

is 40

° C (104° F)]

0.48 

− 0.68 kΩ [when engine coolant 

temperature is 60

° C (140° F)]

0.26 

− 0.36 kΩ [when engine coolant 

temperature is 80

° C (176° F)]

64 

− 57

Intake air temperature sensor

13 

− 17 kΩ [when intake air temperature is -20° 

C (-4

° F)]

5.3 

− 6.7 kΩ [when intake air temperature is 0° 

C (32

° F)]

2.3 

− 3.0 kΩ [when intake air temperature is 20° 

C (68

° F)]

1.0 

− 1.5 kΩ [when intake air temperature is 40° 

C (104

° F)]

0.56 

− 0.76 kΩ [when intake air temperature is 

60

° C (140° F)]

0.30 

− 0.42 kΩ [when intake air temperature is 

80

° C (176° F)]

TERMINAL 
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION 
CONDITION)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-863

CHECK PROCEDURE WITH OSCILLOSCOPE

M1131154500628

VOLUME AIRFLOW SENSOR

Required Special Tool:

• MB991709: Test Harness Set

.

Measurement Method
1. Disconnect the volume airflow sensor connector, and 

connect the test harness special tool (MB991709) in 
between. (All terminals should be connected.)

2. Connect the oscilloscope probe to volume airflow sensor 

connector terminal No. 3.

.

Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal No. 65.
Standard Wave Pattern

Observation conditions

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

Observation conditions

Rev engine, observe T1 and T2 remain equal.

AK102975AC

1 2 3 4 5 6 7

VOLUME AIRFLOW 
SENSOR CONNECTOR

OSCILLOSCOPE

MB991709

AKX01595

THE TIME (CYCLE TIME) T IS REDUCED WHEN THE
AMOUNT OF INTAKE AIR INCREASES.

TIMES T

1

 AND T

2

 ARE EQUAL

T

T

1

T

2

10

0

(V)

TIME

AB

Standard wave pattern

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-864

Wave Pattern Observation Points

1. Check that cycle time T becomes shorter and the frequency 

increases when the engine speed is increased.

.

Examples of Abnormal Wave Patterns
Example 1
Cause of problem

• Sensor interface malfunction.

Wave pattern characteristics

• Rectangular wave pattern is output even when the 

engine is not started.

Example 2
Cause of problem

• Damaged rectifier or vortex generation column.

Wave pattern characteristics

• Unstable wave pattern with non-uniform frequency.An 

ignition leak will distort the wave pattern  temporarily, 
even if the volume airflow sensor is normal.

AKX01596

10

0

(V)

T

TIME

AB

Standard wave pattern

AKX01597

 

 

 

 

 

 

 

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