Mitsubishi Colt Ralliart. Manual - part 97

 

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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

 

 

 

 

 

 

 

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