Mitsubishi Colt Ralliart. Manual - part 750

 

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Mitsubishi Colt Ralliart. Manual - part 750

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-325

STEP 5. Connector check: A-08 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace.

STEP 6. Perform voltage measurement at A-08 
engine-ECU connector.

• Disconnect engine-ECU connector, and connect 

Special Tool Power Plant ECU Check Harness 
(MB991987), and measure the voltage on the 
check connector.

• Voltage between terminal No. 128 and earth.

OK: 

System voltage (Brake pedal: Depressed)
1 V or less (Brake pedal: Released)

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 7 .

AK402725

77

78

79

80

81

82

83

84

92

93

94

95

96

97

98

99

85

86

87

88

89

90

91

100

101

102

103

104

105

106

115

116

117

118

119

120

121

107

108

109

110

111

112

113

114

130

131

132

133

134

135

136

122

123

124

125

126

127

128

129

72 71

74 73

76 75

R

AI

A-08

Connector: 

A-08

A-08 Special tool power plant ECU check 
harness

Engine-ECU

Battery

AK402725

77

78

79

80

81

82

83

84

92

93

94

95

96

97

98

99

85

86

87

88

89

90

91

100

101

102

103

104

105

106

115

116

117

118

119

120

121

107

108

109

110

111

112

113

114

130

131

132

133

134

135

136

122

123

124

125

126

127

128

129

72 71

74 73

76 75

R

AI

A-08

Connector: 

A-08

A-08 Special tool power plant ECU check 
harness

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-326

STEP 7. Check harness between B-59 (terminal 
No. 3) stop lamp switch connector and A-08 
(terminal No. 128) engine-ECU.

• Check output line for open/short circuit.

Q: Is the check result normal?

YES : 

Check and repair the stop lamp switch 

output signal harness and connector for 
short circuit.

NO : 

Repair.

STEP 8. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item 67: Stop lamp switch

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

NO : 

Replace engine-ECU.

AK600593

1

2

3

4

5

6

AB

Connector: B-59

Harness side 
connector

B-59

AK402725

77

78

79

80

81

82

83

84

92

93

94

95

96

97

98

99

85

86

87

88

89

90

91

100

101

102

103

104

105

106

115

116

117

118

119

120

121

107

108

109

110

111

112

113

114

130

131

132

133

134

135

136

122

123

124

125

126

127

128

129

72 71

74 73

76 75

R

AI

A-08

Connector: 

A-08

A-08 Special tool power plant ECU check 
harness

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-327

Inspection Procedure 26: Ignition Circuit System

AK402687

39

1 2 3
4 5 6

1

2 3

1

2 3

1

2 3

1

2 3

19

21

20

18

17

16

15

14

1213

11

8 9

L

10

37
52 53 54 555657585960616263646566

38 39 404142434445464748495051

22 23 24 252627282930313233343536

7

5

3

1

6

4

2

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet  P: Purple

LOCK

ACC

IG1 IG2

ST

10A

Ignition coil 1

Engine-ECU

A-135

(MU802053)

A-127

(MU802053)

A-126

(MU802053)

A-123

(MU802053)

Ignition coil 2

Ignition coil 3

Ignition coil 4

2

3

10

25

40

55

Noise 
condenser

A-111

Ignition switch

L-B

B-W

B-W

B-W

B-W

B-W

B-W

W

W-G

W-B

W-L

B

B

B

B

2

3

15

B-112

A-17

3

B-129

J/B

Ignition Circuit

A-114

AE

Spark
plug

2

1

1

1

1

1

3

Spark
plug

2

3

Spark
plug

2

3

Spark
plug

B141

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-328

OPERATION

• The battery voltage is applied to the ignition coil 

(terminal No. 1) from the ignition switch and is 
earthed to the vehicle body from the ignition coil 
(terminal No. 2).

• A power voltage of 12 V is applied to the ignition 

coil (terminal No. 3) from the engine-ECU (termi-
nals No. 10, No. 25, No. 40 and No. 55).

FUNCTION

• When the engine-ECU makes the power transis-

tor in the unit be in OFF position, the battery volt-
age is applied to the power transistor in the 
ignition coil, making the power transistor be in ON 
position. The engine-ECU makes the power tran-
sistor in the unit be in ON position, and that 
makes the power transistor in the ignition coil be 
in OFF position.

• When the power transistor in the ignition coil is 

turned to ON position in response to the signal 
from the engine-ECU, the primary current flows 
through the ignition coil. When the power transis-
tor in the ignition coil is turned to OFF position, 
the primary current is interrupted and high volt-
age is generated in the secondary coil.

PROBABLE CAUSES

• Failed spark plug

• Failed ignition coil

• Open/short circuit in or damage to the ignition cir-

cuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-123, A-126, A-127 
and A-135 ignition coil connector

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace.

STEP 2. Check ignition coil.

• Check ignition coil (Refer to GROUP 16 − Ignition 

System 

− On-vehicle Service − Ignition Coil 

Check 

P.16-34

). 

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Replace ignition coil.

STEP 3. Perform voltage measurement at A-123, 
A-126, A-127 and A-135 ignition coil connectors.

Disconnect connector and measure at harness side.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Go to Step 4 .

AK402093

1

2

3

A-123(DG)

A-126(DG)

A-127(DG)

A-135(DG)

AC

Harness side connector

Connector: A-123, A-126, A-127, A-135 

AK402093

1

2

3

A-123(DG)

A-126(DG)

A-127(DG)

A-135(DG)

AC

Harness side connector

Connector: A-123, A-126, A-127, A-135 

Main

Index

Group

TOC

 

 

 

 

 

 

 

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