Mitsubishi Galant. Manual — part 185

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-421

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)

1

−

41

No.1 injector

13

−

16

Ω

[at 20

°

C (68

°

F)]

9

−

41

No.2 injector

24

−

41

No.3 injector

2

−

41

No.4 injector

14

−

41

Stepper motor coil (A1)

28

−

33

Ω

[at 20

°

C (68

°

F)]

28

−

41

Stepper motor coil (A2)

15

−

41

Stepper motor coil (B1)

29

−

41

Stepper motor coil (B2)

6

−

41

EGR solenoid

29

−

35

Ω

[at 20

°

C (68

°

F)]

34

−

41

Evaporative emission purge solenoid

30

−

34

Ω

[at 20

°

C (68

°

F)]

42

−

Body ground ECM or PCM ground

Continuity (0

Ω

)

48

−

Body ground ECM or PCM ground

26

−

41

Heated oxygen sensor heater (rear)

11

−

18

Ω

[at 20

°

C (68

°

F)]

35

−

41

Evaporative emission ventilation
solenoid

17

−

21

Ω

[at 20

°

C (68

°

F)]

3

−

41

Heated oxygen sensor heater (front)

4.5

−

8.0

Ω

[at 20

°

C (68

°

F)]

57

−

64

Intake air temperature sensor

5.3

−

6.7 k

Ω

[when intake air temperature is

0

°

C (32

°

F)]

2.3

−

3.0 k

Ω

[when intake air temperature is

20

°

C (68

°

F)]

1.0

−

1.5 k

Ω

[when intake air temperature is

40

°

C (104

°

F)]

0.30

−

0.42 k

Ω

[when intake air temperature is

80

°

C (176

°

F)]

44

−

57

Engine coolant temperature sensor

5.1

−

6.5 k

Ω

[when engine coolant temperature

is 0

°

C (32

°

F)]

2.1

−

2.7 k

Ω

[when engine coolant temperature

is 20

°

C (68

°

F)]

0.9

−

1.3 k

Ω

[when engine coolant temperature

is 40

°

C (104

°

F)]

0.26

−

0.36 k

Ω

[when engine coolant

temperature is 80

°

C (176

°

F)]

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-422

INSPECTION PROCEDURE USING A
OSCILLOSCOPE

M1131009300070

VOLUME AIR FLOW SENSOR

Required Special Tool:
MB991709: Test Harness Set
Measurement Method
1. Disconnect the volume air flow sensor connector, and

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

2. Connect the oscilloscope probe to volume air flow sensor

connector terminal 3.

Alternate method (Test harness not available)
Connect the oscilloscope probe to PCM terminal 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 T

1

and T

2

remain equal.

AKX01594

OSCILLOSCOPE

OSCILLOSCOPE

PLOBE

4 5 6

1 2 3

7

AKX01594AB

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) <2.4L>

13A-423

Wave Pattern Observation Points
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 air flow sensor is normal.

AKX01596

10

0

(V)

T

TIME

AB

Standard wave pattern

AKX01597

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-424

CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR

Required Special Tools:
MB991709: Test Harness Set
MD998478: Test Harness
Measurement Method
1. Disconnect the camshaft position sensor connector, and

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

2. Connect the oscilloscope probe to camshaft position sensor

connector terminal 2.

3. Disconnect the crankshaft position sensor connector, and

connect the test harness special tool (MD998478) in
between.

4. Connect the oscilloscope probe to crankshaft position

sensor connector terminal 2 (black clip of special tool).

Alternate method (Test harness not available)

1. Connect the oscilloscope probe to PCM terminal 56. (Check

the camshaft position sensor signal wave pattern.)

2. Connect the oscilloscope probe to PCM terminal 45. (Check

the crankshaft position sensor signal wave pattern.)

Standard Wave Pattern

Observation conditions

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

AKX01419 AB

CAMSHAFT POSITION
SENSOR CONNECTOR

1 2 3

OSCILLOSCOPE

OSCILLO-
SCOPE
PROBE

AKX01500

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

1 2

3

AB

OSCILLO-
SCOPE
PROBE