Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 334

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-535

TERMINAL RESISTANCE AND CONTINUITY CHECK

92

91

Manifold
differential
pressure sensor

Engine: idling

0.8

−

2.4 V

•

Engine: idling

•

Suddenly depress the accelerator pedal

Rises from 0.8

−

2.4 V suddenly

93

92

Fuel tank
differential
pressure sensor

Engine: idling

1.2

−

3.8 V

99

98

Ignition switch-IG

Ignition switch: "ON"

B+

TERMINAL
NO. <M/T>

TERMINAL
NO. <A/T>

INSPECTION ITEM

INSPECTION CONDITION (ENGINE CONDITION)

NORMAL
CONDITION

AK000059

ECM <M/T> or PCM <A/T> Connector Terminal Arrangement

<M/T>

<A/T>

AB

78

91

71

59

68

47

58

67

56

66

55 54

65

53

64

52

63

46

51

62

44

49

61

42

48

60

41

23

35

8

22 21

34

7

20

33

6

19

32

18

31

17 16

30

15

29

14

28

5

13

27

4

12 11

26

3

10

25

2

9

24

1

23

35

8

47

58

41

48

59

50

60

51

61

52

62

53

54

63

42

55

64

44

56

65

45

57

66

46

78

90

71

79

91

72

81

92

82

93

83

84

94

85

95

86

96

74

88

97

76

89

98

77

108

121

101

109

122

110

123

102

112

124

113

114

125

115

126

116

127

117

128

104

119

129

106

120

130

107

118

105

111

103

87

75

80

73

49

43

22 21

34

7

20

33

6

19

32

18

31

17 16

30

15

29

14

28

5

13

27

4

12 11

26

3

10

25

2

9

24

1

50

43

57

45

79

92

80

93

83

84

95

86

97

87

98

89

99

72

82

94

74

85

96

76

90

100

77

88

75

81

73

TERMINAL
NO.

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

1

−

47

1

−

41

No.1 injector

13

−

16

Ω

[at 20

°

C (68

°

F)]

9

−

47

9

−

41

No.2 injector

24

−

47

24

−

41

No.3 injector

2

−

47

2

−

41

No.4 injector

10

−

47

10

−

41

No.5 injector

25

−

47

25

−

41

No.6 injector

3

−

47

3

−

41

Left bank heated oxygen sensor heater
(front)

4.5

−

8.0

Ω

[at 20

°

C (68

°

F)]

4

−

47

4

−

41

Right bank heated oxygen sensor
heater (front)

4.5

−

8.0

Ω

[at 20

°

C (68

°

F)]

6

−

47

6

−

41

EGR solenoid

29

−

35

Ω

[at 20

°

C (68

°

F)]

14

−

47

14

−

41

Stepper motor coil (A1)

28

−

33

Ω

[at 20

°

C (68

°

F)]

28

−

47

28

−

41

Stepper motor coil (A2)

15

−

47

15

−

41

Stepper motor coil (B1)

29

−

47

29

−

41

Stepper motor coil (B2)

26

−

47

26

−

41

Left bank heated oxygen sensor heater
(rear)

11

−

18

Ω

[at 20

°

C (68

°

F)]

27

−

47

27

−

41

Right bank heated oxygen sensor
heater (rear)

11

−

18

Ω

[at 20

°

C (68

°

F)]

16

−

47

34

−

41

Evaporative emission purge solenoid

30

−

34

Ω

[at 20

°

C (68

°

F)]

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-536

INSPECTION PROCEDURE USING AN
OSCILLOSCOPE

M1131009300069

VOLUME AIR FLOW SENSOR

Required Special Tool:
MB991709: Test Harness
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)

<M/T>

1. Connect the oscilloscope probe to ECM terminal 61.

<A/T>

1. Connect the oscilloscope probe to PCM terminal 65.

35

−

47

35

−

41

Evaporative emission ventilation
solenoid

17

−

21

Ω

[at 20

°

C (68

°

F)]

46

−

Body

ground

42

−

Body

ground

ECM or PCM ground

Continuity (0

Ω

)

58

−

Body

ground

48

−

Body

ground

ECM or PCM ground

44

−

4944

−

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)]

62

−

4964

−

57

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)]

TERMINAL
NO.

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

AKX01594

OSCILLOSCOPE

OSCILLOSCOPE

PLOBE

4 5 6

1 2 3

7

AKX01594AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-537

Standard Wave Pattern

Wave Pattern Observation Points

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

increases when the engine speed is increased.

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.

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

AKX01596

10

0

(V)

T

TIME

AB

Standard wave pattern

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-538

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.

CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR

Required Special Tools:
MB991348: Test Harness
MD998478: Test Harness
Measurement Method
1. Disconnect the camshaft position sensor connector, and

connect the test harness special tool (MB991348) in
between. (All terminals should be connected.)

2. Connect the oscilloscope probe to camshaft position sensor

connector terminal 5.

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)

<M/T>

1. Connect the oscilloscope probe to ECM terminal 50. (Check

the camshaft position sensor signal wave pattern.)

2. Connect the oscilloscope probe to ECM terminal 43. (Check

the crankshaft position sensor signal wave pattern.)

<A/T>

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.)

AKX01597

AK000061

1 2 3 4 5 6 7

OSCILLOSCOPE

CAMSHAFT POSITION
SENSOR CONNECTOR

OSCILLO-

SCOPE

PROBE

AB

AKX01500

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

1 2

3

AB

OSCILLO-
SCOPE
PROBE