Mitsubishi Colt Ralliart. Manual — part 97

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-342

CHECK AT THE ECU TERMINALS

M1131153500885

TERMINAL VOLTAGE CHECK CHART

1. Disconnect the engine-ECU connector or

engine-CVT-ECU connector, and connect check
harness special tool MB991987 between the
engine-ECU connector or engine-CVT-ECU
connectors.

2. Measure the voltage between each check

harness connector terminal and check harness
connector earth terminal (No. 75 or No. 76).

3. Connect a needle-nosed wire probe to a voltmeter

probe.

4. Referring to the check sheet, insert the micromini

probe into the check harness connector and
measure the voltage.

NOTE:

.

1. You may find it convenient to pull out the

engine-ECU <M/T> or engine-CVT-ECU
<CVT> to make it easier to reach the connec-
tor terminals.

2. The checks can be carried out off the order

given in the chart.

CAUTION

Short-circuiting the positive (+) probe between a
connector terminal and earth could damage the
vehicle wiring, the sensor, engine-ECU <M/T> or
engine-CVT-ECU <CVT> or all of them. Be careful
to prevent this!
5. If voltmeter shows any division from standard

value, check the corresponding sensor, actuator
and related electrical wiring, then repair or
replace.

6. After repair or replacement, recheck with the

voltmeter to confirm that the repair has corrected
the problem.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-343

Engine-ECU <M/T> or Engine-CVT-ECU <CVT> Connector Terminal Arrangement

AK402726

61

46

31

64

49

19
34

50

51
6665

36

21

35

20

47

48
6362

33

18

32

17

58

43

28

44

45
6059

30

1615

29

14

41

42
5756

27

12

13

26

11

53

38

23

8

39

40

54

55

24

9

L

25

10

37
52

22

7

5

3

1

6

4

2

93

71

72

75

73

76

74

92

77

98

83

95 94

R

96

97

80

78

79

81

82

99

86

84

85

107
122

108
123

109
124

110
125

111
126

112
127

113
128

114
129

115
130

116
131

117
132

118
133

119
134

120
135

121
136

101100

102

103

104

105

106

87

88

919089

A-114

A-08

AB

Special Tool Check Harness (MB991987) Connector Terminal Arrangement

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

5

EGR valve (A)
<CVT>

Ignition switch: Immediately after turning ON 5

− 8 V* (fluctuates for

approximately 3 seconds)

6

EGR valve (B)
<CVT>

53

EGR valve (C)
<CVT>

54

EGR valve (D)
<CVT>

7

Throttle valve control
servo (+)

• Ignition switch: ON

• Accelerator pedal: fully opened → fully

closed

Decreases slightly
(approximately 2 V) from
battery voltage.

8

No. 1 injector

While engine is idling after having warmed
up, suddenly depress the accelerator pedal.

From 9

− 13 V

*

,

momentarily drops slightly

9

No. 2 injector

23

No. 3 injector

24

No. 4 injector

10

Ignition coil

− No. 1

Engine r/min: 3,000 r/min

0.1

− 2.0 V*

25

Ignition coil

− No. 2

40

Ignition coil

− No. 3

55

Ignition coil

− No. 4

12

Camshaft position
sensor

Engine: Cranking

2.0

− 4.8 V

*

Engine: Idling

3.0

− 4.0 V

*

13

Crank angle sensor

Engine: Cranking

0.4

− 4.0 V

*

Engine: Idling

2.0

− 3.0 V

*

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-344

14

Engine coolant
temperature sensor

Ignition switch: ON

When engine coolant
temperature is

−20°C

3.9

− 4.5 V

When engine coolant
temperature is 0

°C

3.2

− 3.8 V

When engine coolant
temperature is 20

°C

2.3

− 2.9 V

When engine coolant
temperature is 40

°C

1.3

− 1.9 V

When engine coolant
temperature is 60

°C

0.7

− 1.3 V

When engine coolant
temperature is 80

°C

0.3

− 0.9 V

15

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
(MB991658).

• Ignition switch:

"ON"

Fully close the throttle
valve with your finger

0.3

− 0.7 V

Fully open the throttle
valve with your finger

4 V or more

16

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
(MB991658).

• Ignition switch: ON

Fully close the throttle
valve with your finger

4.3

− 4.7 V

Fully open the throttle
valve with your finger

0.2

− 0.6 V

17

Manifold absolute
pressure sensor

Ignition switch: ON

Altitude: 0 m

3.8

− 4.2 V

Altitude: 600 m

3.5

− 3.9 V

Altitude: 1,200 m

3.3

− 3.7 V

Altitude: 1,800 m

3.0

− 3.4 V

Engine: Idling after warmed up

0.9

− 1.9 V

Engine: While engine is idling, suddenly
depress the accelerator pedal

From 0.9

− 1.9 V,

momentarily drops

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-345

22

Throttle valve control
servo (

−)

• Ignition switch: ON

• Accelerator pedal: fully closed → fully

opened

Decreases slightly
(approximately 2 V) from
battery voltage.

31

Power supply
voltage applied to
throttle position
sensor

Ignition switch: ON

4.9

− 5.1 V

34

Oxygen sensor
(front)

Engine: Running at 2,500 r/min after warmed
up

0.4 V or less

⇔ 0.6 − 1.0 V

(Changes repeatedly)

38

Purge control
solenoid valve

Ignition switch: ON

System voltage

Engine: Warming up, racing

Voltage decreases

39

Ignition switch

− ST Engine: Cranking

8 V or more

51

Oxygen sensor
(front) heater

Engine: Idling after warming up

1 V or less

Engine: 5,000 r/min or more

System voltage

52

Oil feeder control
valve

Ignition switch: ON

System voltage

Running with high load

4.0

− 10 V*

56

Intake air
temperature sensor

Ignition switch: ON

When intake air
temperature is

−20°C

3.8

− 4.4 V

When intake air
temperature is 0

°C

3.2

− 3.8 V

When intake air
temperature is 20

°C

2.3

− 2.9 V

When intake air
temperature is 40

°C

1.5

− 2.1 V

When intake air
temperature is 60

°C

0.8

− 1.4 V

When intake air
temperature is 80

°C

0.4

− 1.0 V

64

Alternator G terminal

• Engine: Warm, idle (radiator fan: OFF)

• Headlamp: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage increases

65

Alternator FR
terminal

• Engine: Warm, idle (radiator fan: OFF)

• Headlamp: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage decreases

77

Power supply

Ignition switch: ON

System voltage

92
78

Power supply
voltage applied to
throttle valve control
servo

Ignition switch: ON

System voltage

79

Oxygen sensor
heater (rear)

Engine: Idling

1 V or less

Engine: 5,000 r/min

System voltage

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

Main

Index

Group

TOC